doc: add TODO items

.custom-gcl.yaml

@@ -0,0 +1,10 @@
+# Builds a golangci-lint binary with the shared custom linters from go-lint.
+#
+# The version MUST stay in lockstep with the installed golangci-lint version:
+# plugins link against golangci-lint internals.
+version: v2.13.1
+name: golint
+destination: ./bin
+plugins:
+  - module: git.offline-twitter.com/offline-labs/go-lint
+    version: v0.0.0-20261018231414-f5b6076dce76

.gitignore

@@ -4,3 +4,4 @@ sample_data/data
 .cmd-old/
 pkg/.testapp
 .claude
+bin

.golangci.yaml

@@ -20,7 +20,20 @@ linters:
     - whitespace
     - wrapcheck
 
+    # Shared custom linters from ../go-lint.
+    - ifinit
+    - boolnames
+
   settings:
+    custom:
+      ifinit:
+        type: module
+        description: if-statement init clauses must be on a single line
+      boolnames:
+        type: module
+        description: boolean variables and functions should use is, has, was, and similar prefixes
+        settings:
+          allowed_prefixes: ["is", "has", "can", "was", "should"]
     depguard:
       rules:
         main:
@@ -54,15 +67,16 @@ linters:
       require-specific: true
       allow-unused: false
     staticcheck:
-      go: "1.24"
       checks:
         - all
         - -ST1000 # Re-enable this once we have docstrings
-        - -ST1003 # I like snake_case
         - -ST1013 # HTTP status codes are shorter and more readable than names
+    wrapcheck:
+      report-internal-errors: false
+      extra-ignore-sigs:
+        - json.Marshal(
   exclusions:
     generated: lax # Don't lint generated files
-    paths:
 
 formatters:
   enable:
@@ -78,7 +92,6 @@ formatters:
       simplify: true
   exclusions:
     generated: lax
-    paths:
 
 run:
   build-tags:

cmd/main.go

@@ -16,19 +16,19 @@ const (
 )
 
 func main() {
-	root_cmd := &cobra.Command{
+	rootCmd := &cobra.Command{
 		Use:           "gas",
 		Version:       version.String(),
 		SilenceErrors: true,
 		SilenceUsage:  true,
 	}
 	// Print a bare version string ("v0.0.4"), rather than cobra's "gas version v0.0.4".
-	root_cmd.SetVersionTemplate("{{.Version}}\n")
-	root_cmd.AddCommand(sqlite_lint)
-	root_cmd.AddCommand(cmd_init)
-	root_cmd.AddCommand(generate_model)
-	root_cmd.AddCommand(cmd_version)
-	if err := root_cmd.Execute(); err != nil {
+	rootCmd.SetVersionTemplate("{{.Version}}\n")
+	rootCmd.AddCommand(sqliteLint)
+	rootCmd.AddCommand(cmdInit)
+	rootCmd.AddCommand(generateModel)
+	rootCmd.AddCommand(cmdVersion)
+	if err := rootCmd.Execute(); err != nil {
 		fmt.Println(RED + err.Error() + RESET)
 		os.Exit(1)
 	}

cmd/subcmd_generate_models.go

@@ -17,7 +17,7 @@ import (
 
 var ErrNoSuchTable = errors.New("no such table")
 
-var generate_model = &cobra.Command{
+var generateModel = &cobra.Command{
 	Use:   "generate <model_name>",
 	Short: "Generate a model type",
 
@@ -119,7 +119,7 @@ var generate_model = &cobra.Command{
 }
 
 func init() {
-	generate_model.Flags().String("schema", "pkg/db/schema.sql", "Path to SQL schema file")
-	generate_model.Flags().String("modname", "mymodule", "Name of project's Go module (TODO: detect automatically)")
-	generate_model.Flags().Bool("test", false, "Generate test file instead of regular file")
+	generateModel.Flags().String("schema", "pkg/db/schema.sql", "Path to SQL schema file")
+	generateModel.Flags().String("modname", "mymodule", "Name of project's Go module (TODO: detect automatically)")
+	generateModel.Flags().Bool("test", false, "Generate test file instead of regular file")
 }

cmd/subcmd_init.go

@@ -12,7 +12,7 @@ import (
 	"git.offline-twitter.com/offline-labs/gas-stack/pkg/must"
 )
 
-var cmd_init = &cobra.Command{
+var cmdInit = &cobra.Command{
 	Use:   "init [path]",
 	Short: "Initialize a new project",
 	Long:  "Initialize a new Gas Stack project at the given path.  If no path is given, defaults to current directory.",
@@ -31,7 +31,7 @@ var cmd_init = &cobra.Command{
 		}
 
 		// Get all the config values
-		get_val := func(prompt string, val *string) {
+		getVal := func(prompt string, val *string) {
 			fmt.Printf("%s (%q): ", prompt, *val)
 			scanner := bufio.NewScanner(os.Stdin)
 			scanner.Scan()
@@ -40,31 +40,31 @@ var cmd_init = &cobra.Command{
 				*val = input
 			}
 		}
-		pkg_opts := codegen.PkgOpts{
+		pkgOpts := codegen.PkgOpts{
 			ModuleName: must.Get(cmd.Flags().GetString("module")),
 			DBFilename: must.Get(cmd.Flags().GetString("db")),
 			BinaryName: must.Get(cmd.Flags().GetString("binary")),
 		}
-		if pkg_opts.ModuleName == "" {
-			pkg_opts.ModuleName = filepath.Base(target)
-			get_val("module name", &pkg_opts.ModuleName)
+		if pkgOpts.ModuleName == "" {
+			pkgOpts.ModuleName = filepath.Base(target)
+			getVal("module name", &pkgOpts.ModuleName)
 		}
-		if pkg_opts.DBFilename == "" {
-			pkg_opts.DBFilename = pkg_opts.ModuleName + ".db"
-			get_val("db name", &pkg_opts.DBFilename)
+		if pkgOpts.DBFilename == "" {
+			pkgOpts.DBFilename = pkgOpts.ModuleName + ".db"
+			getVal("db name", &pkgOpts.DBFilename)
 		}
-		if pkg_opts.BinaryName == "" {
-			pkg_opts.BinaryName = pkg_opts.ModuleName
-			get_val("binary name", &pkg_opts.BinaryName)
+		if pkgOpts.BinaryName == "" {
+			pkgOpts.BinaryName = pkgOpts.ModuleName
+			getVal("binary name", &pkgOpts.BinaryName)
 		}
 
 		// Run project initialization
-		codegen.InitPkg(pkg_opts)
+		codegen.InitPkg(pkgOpts)
 	},
 }
 
 func init() {
-	cmd_init.Flags().String("module", "", "Module name")
-	cmd_init.Flags().String("db", "", "Database filename")
-	cmd_init.Flags().String("binary", "", "Binary name")
+	cmdInit.Flags().String("module", "", "Module name")
+	cmdInit.Flags().String("db", "", "Database filename")
+	cmdInit.Flags().String("binary", "", "Binary name")
 }

cmd/subcmd_sqlite_lint.go

@@ -12,7 +12,7 @@ import (
 	"git.offline-twitter.com/offline-labs/gas-stack/pkg/schema/lint"
 )
 
-var sqlite_lint = &cobra.Command{
+var sqliteLint = &cobra.Command{
 	Use:   "sqlite_lint <path/to/schema.sql>",
 	Short: "Lint a SQLite schema",
 
@@ -32,18 +32,18 @@ var sqlite_lint = &cobra.Command{
 			os.Exit(1)
 		}
 
-		is_failure := false
+		isFailure := false
 		// Execute each check against the database
 		for _, check := range lint.Checks {
 			// Checks can be disabled via Github config / environment variables
-			if !is_check_enabled(check) {
+			if !isCheckEnabled(check) {
 				continue
 			}
 			results := check.Execute(schema)
 
 			// If there are results, print them as lint errors
 			if len(results) > 0 {
-				is_failure = true
+				isFailure = true
 				fmt.Printf(RED+"Check '%s' failed:\n"+RESET, check.Name)
 				for _, result := range results {
 					fmt.Printf(RED+"- %s: %s.%s\n"+RESET, result.ErrorMsg, result.TableName, result.ColumnName)
@@ -51,7 +51,7 @@ var sqlite_lint = &cobra.Command{
 				fmt.Printf(RED+"Explanation: %s\n\n"+RESET, check.Explanation)
 			}
 		}
-		if is_failure {
+		if isFailure {
 			fmt.Println(RED + "Errors found" + RESET)
 			os.Exit(1)
 		}
@@ -61,16 +61,16 @@ var sqlite_lint = &cobra.Command{
 
 // github_actions_input_env_var converts an input name to the corresponding
 // environment variable name used by GitHub Actions.
-func github_actions_input_env_var(name string) string {
+func githubActionsInputEnvVar(name string) string {
 	// GitHub normalizes both hyphens and underscores to underscores, then uppercases the name
 	normalized := strings.NewReplacer("-", "_", " ", "_").Replace(name)
 	return "INPUT_" + strings.ToUpper(normalized)
 }
 
 // Setting the environment variable INPUT_REQUIRE_NOT_NULL="false" disables the "require_not_null" check
-func is_check_enabled(c lint.Check) bool {
-	val, is_set := os.LookupEnv(github_actions_input_env_var(c.Name))
-	if !is_set {
+func isCheckEnabled(c lint.Check) bool {
+	val, isSet := os.LookupEnv(githubActionsInputEnvVar(c.Name))
+	if !isSet {
 		// Enable all checks by default
 		return true
 	}

cmd/subcmd_version.go

@@ -8,7 +8,7 @@ import (
 	"git.offline-twitter.com/offline-labs/gas-stack/pkg/version"
 )
 
-var cmd_version = &cobra.Command{
+var cmdVersion = &cobra.Command{
 	Use:   "version",
 	Short: "Print the version of `gas`",
 	Args:  cobra.NoArgs,

doc/TODO.txt

@@ -38,3 +38,15 @@ TODO: test reporter
 
 TODO: foreign key to compound-FK table
     - sample: booru_post_tag_votes
+
+TODO: crap score
+
+TODO: MakeSaveItem() fixture factory
+
+TODO: better schema parsing with less weird views
+- omp --resume 01a0ef0b-9452-7000-a63a-6d5cabf07646
+
+TODO: sqlite row-level locking
+- https://chatgpt.com/c/6ace6870-bf10-83e8-8e0c-98569ae9303f
+
+TODO: `ops/gas_init_test.sh` "gas generate item_to_item --test"

doc/links.txt

@@ -1,3 +1,4 @@
 https://astexplorer.net/
 https://github.com/dave/dst
 https://disaev.me/p/writing-useful-go-analysis-linter/
+https://www.sqlservercentral.com/articles/lookup-table-madness

doc/todo/admin-pages.md

@@ -0,0 +1,7 @@
+Index page: Table view
+Create / edit form (doubles as detail view)
+
+https://chatgpt.com/c/6ab70fe2-0158-83e8-b869-d4b3d8b84192
+https://chatgpt.com/c/6aa96c42-493c-83e8-927f-aa7b47a7cc9f
+https://github.com/GoAdminGroup/go-admin?utm_source=chatgpt.com
+https://github.com/qor/qor

ops/build-lint.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env sh
+
+set -e
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+PROJECT_ROOT=$(cd "$SCRIPT_DIR/.." && pwd)
+cd "$PROJECT_ROOT" # .custom-gcl.yaml is only discovered in the project root.
+
+# go-lint is public, but the public checksum database has not indexed it yet.
+# Preserve existing exclusions while fetching the module through the normal
+# proxy-then-direct resolution path.
+export GONOSUMDB="${GONOSUMDB:+$GONOSUMDB,}git.offline-twitter.com"
+
+BIN="bin/golint"
+STAMP="bin/.golint.stamp"
+
+# The pinned plugin version is recorded in .custom-gcl.yaml.
+current_stamp() {
+    sha256sum .custom-gcl.yaml | cut -d' ' -f1
+}
+
+if [ "$1" = "--if-needed" ] &&
+   [ -x "$BIN" ] &&
+   [ -f "$STAMP" ] &&
+   [ "$(cat "$STAMP")" = "$(current_stamp)" ]; then
+    exit 0
+fi
+
+if ! [ -x "$(command -v golangci-lint)" ]; then
+    echo "golangci-lint is not installed. Please install it from https://golangci-lint.run/welcome/install/"
+    exit 1
+fi
+
+mkdir -p bin
+echo "Building golint (golangci-lint + shared custom linters)..."
+golangci-lint custom
+current_stamp > "$STAMP"
+
+echo "Done: $PROJECT_ROOT/$BIN"

ops/devcontainer/Dockerfile

@@ -1,13 +1,13 @@
 # A dev container.
 
-FROM alpine:3.22
+FROM alpine:3.24
 
 RUN apk add build-base git go sqlite vim shellcheck curl jq sudo bash docker
 
 # Busybox `less` doesn't appear to support colors (makes git diff lose color)
 RUN apk add less
 
-RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b /usr/local/bin v2.0.2
+RUN curl -sSfL https://golangci-lint.run/install.sh | sh -s -- -b /usr/local/bin v2.14.0
 RUN GOBIN=/usr/local/bin go install git.offline-twitter.com/offline-labs/gocheckout@v0.0.2
 
 COPY etc/group /etc/group

ops/gas_init_test.sh

@@ -59,6 +59,7 @@ EOF
 $gas generate items > pkg/db/item.go
 $gas generate items --test > pkg/db/item_test.go
 $gas generate item_to_item > pkg/db/item_to_item.go
+# $gas generate item_to_item --test > pkg/db/item_to_item_test.go
 go mod tidy
 
 # Run the tests

ops/lint.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+
+set -e
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+PROJECT_ROOT=$(cd "$SCRIPT_DIR/.." && pwd)
+cd "$PROJECT_ROOT"
+
+./ops/build-lint.sh --if-needed
+GOLANGCI="./bin/golint"
+
+echo "Linting $(go list ./... | wc -w) packages"
+
+# Catches config keys in the wrong place, which are otherwise silently ignored.
+"$GOLANGCI" config verify
+"$GOLANGCI" run $@

ops/test.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-go test -tags fts5 ./...
+go test -tags fts5 ./... $@

pkg/codegen/modelgenerate/generate_model.go

@@ -296,9 +296,8 @@ func GenerateSaveItemFunc(tbl schema.Table) *ast.FuncDecl {
 	updatePairs := make([]string, 0, len(tbl.Columns))
 
 	hasCreatedAt, hasUpdatedAt := tbl.HasAutoTimestamps()
-	hasSoftDelete := tbl.HasSoftDelete()
 
-	// Assemble data for building SQL "insert" and "update" strings
+	// Assemble SQL "insert" string
 	for _, col := range tbl.Columns {
 		if col.Name == "rowid" {
 			continue
@@ -309,23 +308,20 @@ func GenerateSaveItemFunc(tbl schema.Table) *ast.FuncDecl {
 			val = fmt.Sprintf("nullif(%s, 0)", val)
 		}
 		insertVals = append(insertVals, val)
-		// created_at should not be updated after creation
-		if col.Name == "created_at" && hasCreatedAt {
-			continue
-		}
-		// Soft-delete state is managed by SoftDeleteXyz(), not by updates
-		if hasSoftDelete && (col.Name == "is_deleted" || col.Name == "deleted_at") {
-			continue
-		}
-		if !col.IsPrimaryKey { // Don't try to update primary key columns (mainly for w/o rowid tables)
-			updatePairs = append(updatePairs, col.Name+"="+val)
-		}
 	}
 	insertStmt := fmt.Sprintf("\n\t\t    insert into %s (%s)\n\t\t         values (%s)\n\t\t",
 		tbl.TableName,
 		strings.Join(insertCols, ", "),
 		strings.Join(insertVals, ", "),
 	)
+	// ...and "update" string
+	for _, col := range tbl.GetUpdateableColumns() {
+		val := ":" + col.Name
+		if col.IsNullableForeignKey() {
+			val = fmt.Sprintf("nullif(%s, 0)", val)
+		}
+		updatePairs = append(updatePairs, col.Name+"="+val)
+	}
 	updateStmt := fmt.Sprintf("\n\t\t    update %s\n\t\t       set %s\n\t\t     where rowid = :rowid\n\t\t",
 		tbl.TableName,
 		strings.Join(updatePairs, ",\n\t\t           "),

pkg/codegen/modelgenerate/generate_testfile.go

@@ -67,26 +67,18 @@ func SampleValue(c pkgschema.Column, offset int) ast.Expr {
 }
 
 // UpdateTestFields returns the columns for which the test generator should assign its own
-// sample values, in the MakeXyz() factory and in the create/update test: the same columns
-// that GenerateSaveItemFunc's "update" branch writes to, minus foreign keys (which can't be
-// given plausible values here), the auto-managed "created_at"/"updated_at" columns, and the
-// soft-delete columns (which SoftDeleteXyz() manages).
+// sample values in MakeXyz() and the create/update test. It starts with Table.GetUpdateableColumns()
+// and removes fields the generated test should not assign directly: foreign keys and auto-managed
+// updated_at.
 func UpdateTestFields(tbl pkgschema.Table) (ret []pkgschema.Column) {
-	hasCreatedAt, hasUpdatedAt := tbl.HasAutoTimestamps()
-	hasSoftDelete := tbl.HasSoftDelete()
-	for _, c := range tbl.Columns {
-		if c.Name == "rowid" || c.IsPrimaryKey || c.IsForeignKey {
-			continue
-		}
-		if c.Name == "created_at" && hasCreatedAt {
+	_, hasUpdatedAt := tbl.HasAutoTimestamps()
+	for _, c := range tbl.GetUpdateableColumns() {
+		if c.IsForeignKey {
 			continue
 		}
 		if c.Name == "updated_at" && hasUpdatedAt {
 			continue
 		}
-		if hasSoftDelete && (c.Name == "is_deleted" || c.Name == "deleted_at") {
-			continue
-		}
 		ret = append(ret, c)
 	}
 	return
@@ -101,12 +93,55 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 
 	hasCreatedAt, hasUpdatedAt := tbl.HasAutoTimestamps()
 	updateTestFields := UpdateTestFields(tbl)
+	uniqueColumns := map[string]bool{}
+	for _, index := range schema.Indexes {
+		if index.TableName != tbl.TableName || !index.IsUnique {
+			continue
+		}
+		for _, columnName := range index.Columns {
+			uniqueColumns[columnName] = true
+		}
+	}
+	hasRandomUniqueField := false
+	for _, c := range updateTestFields {
+		if uniqueColumns[c.Name] {
+			hasRandomUniqueField = true
+			break
+		}
+	}
+	requiredForeignKeys := []pkgschema.Column{}
+	for _, c := range tbl.Columns {
+		// Only ordinary object foreign keys use a distinct TargetObjectID Go type;
+		// code-table foreign keys retain their underlying SQLite type in the generated model.
+		if c.IsNotNull && c.IsNonCodeTableForeignKey() {
+			requiredForeignKeys = append(requiredForeignKeys, c)
+		}
+	}
+	requiredForeignKeyParamNames := paramNamesFor(requiredForeignKeys)
+
+	// Calls made by this generated test do not create related objects themselves. Pass a
+	// zero ID so the generated test remains syntactically valid; callers of MakeXyz provide
+	// IDs of the related objects they create.
+	makeItemArgs := func() (ret []ast.Expr) {
+		for range requiredForeignKeys {
+			ret = append(ret, &ast.BasicLit{Kind: token.INT, Value: "0"})
+		}
+		return
+	}()
 
 	// func MakeItem() Item { return Item{} }
 	makeItemFunc := &ast.FuncDecl{
 		Name: makeHelperName,
 		Type: &ast.FuncType{
-			Params: &ast.FieldList{},
+			Params: &ast.FieldList{List: func() (ret []*ast.Field) {
+				for i, c := range requiredForeignKeys {
+					ret = append(ret, &ast.Field{
+						Names: []*ast.Ident{ast.NewIdent(requiredForeignKeyParamNames[i])},
+						Type:  GoTypeForColumn(c),
+					})
+				}
+				return
+			}()},
 			Results: &ast.FieldList{
 				List: []*ast.Field{
 					{Type: ast.NewIdent(tbl.GoTypeName)},
@@ -114,24 +149,71 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 			},
 		},
 		Body: &ast.BlockStmt{
-			List: []ast.Stmt{
-				&ast.ReturnStmt{
-					Results: []ast.Expr{
-						&ast.CompositeLit{
-							Type: ast.NewIdent(tbl.GoTypeName),
-							Elts: func() (ret []ast.Expr) {
-								for _, c := range updateTestFields {
-									ret = append(ret, &ast.KeyValueExpr{
-										Key:   ast.NewIdent(c.GoFieldName()),
-										Value: SampleValue(c, 0),
-									})
-								}
-								return
-							}(),
+			List: append(
+				func() []ast.Stmt {
+					if !hasRandomUniqueField {
+						return nil
+					}
+					return []ast.Stmt{&ast.AssignStmt{
+						Lhs: []ast.Expr{ast.NewIdent("id")},
+						Tok: token.DEFINE,
+						Rhs: []ast.Expr{&ast.CallExpr{Fun: &ast.SelectorExpr{X: ast.NewIdent("rand"), Sel: ast.NewIdent("Int")}}},
+					}}
+				}(),
+				[]ast.Stmt{
+					&ast.ReturnStmt{
+						Results: []ast.Expr{
+							&ast.CompositeLit{
+								Type: ast.NewIdent(tbl.GoTypeName),
+								Elts: func() (ret []ast.Expr) {
+									// `UpdateTestFields()` skips foreign keys, so this will not cause duplicates
+									for i, c := range requiredForeignKeys {
+										ret = append(ret, &ast.KeyValueExpr{
+											Key:   ast.NewIdent(c.GoFieldName()),
+											Value: ast.NewIdent(requiredForeignKeyParamNames[i]),
+										})
+									}
+									for _, c := range updateTestFields {
+										value := SampleValue(c, 0)
+										if uniqueColumns[c.Name] {
+											switch c.Type {
+											case "integer", "int":
+												value = ast.NewIdent("id")
+											case "text":
+												value = &ast.CallExpr{
+													Fun: &ast.SelectorExpr{X: ast.NewIdent("fmt"), Sel: ast.NewIdent("Sprintf")},
+													Args: []ast.Expr{
+														&ast.BasicLit{Kind: token.STRING, Value: `"%s-%d"`},
+														SampleValue(c, 0),
+														ast.NewIdent("id"),
+													},
+												}
+											case "blob":
+												value = &ast.CallExpr{
+													Fun: &ast.ArrayType{Elt: ast.NewIdent("byte")},
+													Args: []ast.Expr{&ast.CallExpr{
+														Fun: &ast.SelectorExpr{X: ast.NewIdent("fmt"), Sel: ast.NewIdent("Sprintf")},
+														Args: []ast.Expr{
+															&ast.BasicLit{Kind: token.STRING, Value: `"%s-%d"`},
+															&ast.CallExpr{Fun: ast.NewIdent("string"), Args: []ast.Expr{SampleValue(c, 0)}},
+															ast.NewIdent("id"),
+														},
+													}},
+												}
+											}
+										}
+										ret = append(ret, &ast.KeyValueExpr{
+											Key:   ast.NewIdent(c.GoFieldName()),
+											Value: value,
+										})
+									}
+									return
+								}(),
+							},
 						},
 					},
-				},
-			},
+				}...,
+			),
 		},
 	}
 
@@ -242,7 +324,8 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 							Tok: map[bool]token.Token{true: token.DEFINE, false: token.ASSIGN}[isFirst],
 							Rhs: []ast.Expr{
 								&ast.CallExpr{
-									Fun: ast.NewIdent("Make" + tbl.GoTypeName),
+									Fun:  ast.NewIdent("Make" + tbl.GoTypeName),
+									Args: makeItemArgs,
 								},
 							},
 						},
@@ -329,7 +412,7 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 					&ast.AssignStmt{
 						Lhs: []ast.Expr{testObj},
 						Tok: token.DEFINE,
-						Rhs: []ast.Expr{&ast.CallExpr{Fun: makeHelperName, Args: nil}},
+						Rhs: []ast.Expr{&ast.CallExpr{Fun: makeHelperName, Args: makeItemArgs}},
 					},
 					// item.Description = <sample value, offset 1>
 					// ...one assignment per updatable field
@@ -395,39 +478,41 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 					makeDeepEqual(testObj, testObj2),
 				)
 
-				stmts = append(stmts,
-					BlankLine(),
-					Comment("Update"),
-				)
+				if len(tbl.GetUpdateableColumns()) > 0 { // Skip if no mutable fields
+					stmts = append(stmts,
+						BlankLine(),
+						Comment("Update"),
+					)
 
-				// item.Description = <sample value, offset 2>
-				// ...one assignment per updatable field
-				for _, c := range updateTestFields {
-					stmts = append(stmts, &ast.AssignStmt{
-						Lhs: []ast.Expr{&ast.SelectorExpr{X: testObj, Sel: ast.NewIdent(c.GoFieldName())}},
-						Tok: token.ASSIGN,
-						Rhs: []ast.Expr{SampleValue(c, 2)},
-					})
+					// item.Description = <sample value, offset 2>
+					// ...one assignment per updatable field
+					for _, c := range updateTestFields {
+						stmts = append(stmts, &ast.AssignStmt{
+							Lhs: []ast.Expr{&ast.SelectorExpr{X: testObj, Sel: ast.NewIdent(c.GoFieldName())}},
+							Tok: token.ASSIGN,
+							Rhs: []ast.Expr{SampleValue(c, 2)},
+						})
+					}
+
+					stmts = append(stmts,
+						// TestDB.SaveItem(&item)
+						&ast.ExprStmt{X: &ast.CallExpr{
+							Fun:  &ast.SelectorExpr{X: testDB, Sel: ast.NewIdent("Save" + tbl.GoTypeName)},
+							Args: []ast.Expr{&ast.UnaryExpr{Op: token.AND, X: testObj}},
+						}},
+
+						// item2 = must.Get(TestDB.GetItemByID(item.ID))
+						&ast.AssignStmt{
+							Lhs: []ast.Expr{testObj2},
+							Tok: token.ASSIGN,
+							Rhs: []ast.Expr{mustCall(getItemByPKCall(testObj))},
+						},
+
+						// if deep.Equal(...) {...}
+						makeDeepEqual(testObj, testObj2),
+					)
 				}
 
-				stmts = append(stmts,
-					// TestDB.SaveItem(&item)
-					&ast.ExprStmt{X: &ast.CallExpr{
-						Fun:  &ast.SelectorExpr{X: testDB, Sel: ast.NewIdent("Save" + tbl.GoTypeName)},
-						Args: []ast.Expr{&ast.UnaryExpr{Op: token.AND, X: testObj}},
-					}},
-
-					// item2 = must.Get(TestDB.GetItemByID(item.ID))
-					&ast.AssignStmt{
-						Lhs: []ast.Expr{testObj2},
-						Tok: token.ASSIGN,
-						Rhs: []ast.Expr{mustCall(getItemByPKCall(testObj))},
-					},
-
-					// if deep.Equal(...) {...}
-					makeDeepEqual(testObj, testObj2),
-				)
-
 				indexGets, hasIndexedGets := []ast.Stmt{
 					BlankLine(),
 					Comment("Indexed lookups"),
@@ -560,23 +645,33 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 		Decls: append([]ast.Decl{
 			&ast.GenDecl{
 				Tok: token.IMPORT,
-				Specs: []ast.Spec{
-					&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"testing"`}},
-					&ast.ImportSpec{
-						Path: &ast.BasicLit{Kind: token.STRING, Value: `"git.offline-twitter.com/offline-labs/gas-stack/pkg/db"`},
-						Name: ast.NewIdent("."),
-					},
-					&ast.ImportSpec{
-						Path: &ast.BasicLit{Kind: token.STRING, Value: `"git.offline-twitter.com/offline-labs/gas-stack/pkg/must"`},
-					},
-					&ast.ImportSpec{
-						Path: &ast.BasicLit{Kind: token.STRING, Value: fmt.Sprintf(`"%s/pkg/%s"`, gomodName, packageName)},
-						Name: ast.NewIdent("."),
-					},
-					&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/go-test/deep"`}},
-					&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/stretchr/testify/assert"`}},
-					&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/stretchr/testify/require"`}},
-				},
+				Specs: func() []ast.Spec {
+					specs := []ast.Spec{}
+					if hasRandomUniqueField {
+						specs = append(specs,
+							&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"fmt"`}},
+							&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"math/rand"`}},
+						)
+					}
+					specs = append(specs, []ast.Spec{
+						&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"testing"`}},
+						&ast.ImportSpec{
+							Path: &ast.BasicLit{Kind: token.STRING, Value: `"git.offline-twitter.com/offline-labs/gas-stack/pkg/db"`},
+							Name: ast.NewIdent("."),
+						},
+						&ast.ImportSpec{
+							Path: &ast.BasicLit{Kind: token.STRING, Value: `"git.offline-twitter.com/offline-labs/gas-stack/pkg/must"`},
+						},
+						&ast.ImportSpec{
+							Path: &ast.BasicLit{Kind: token.STRING, Value: fmt.Sprintf(`"%s/pkg/%s"`, gomodName, packageName)},
+							Name: ast.NewIdent("."),
+						},
+						&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/go-test/deep"`}},
+						&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/stretchr/testify/assert"`}},
+						&ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"github.com/stretchr/testify/require"`}},
+					}...)
+					return specs
+				}(),
 			},
 		}, testList...),
 	}

pkg/db/connect.go

@@ -17,18 +17,18 @@ type DBConfig struct {
 	// is_initialized bool
 
 	// The SQL schema of the database under management
-	sql_schema *string
+	sqlSchema *string
 
 	// Database starts at version 0.  First migration brings us to version 1
-	migrations     *[]Migration
-	version_number uint
+	migrations    *[]Migration
+	versionNumber uint
 }
 
 func Init(schema *string, migrationsList *[]Migration) DBConfig {
 	return DBConfig{
-		sql_schema:     schema,
-		migrations:     migrationsList,
-		version_number: uint(len(*migrationsList)),
+		sqlSchema:     schema,
+		migrations:    migrationsList,
+		versionNumber: uint(len(*migrationsList)),
 	}
 }
 
@@ -52,7 +52,7 @@ func (c DBConfig) Create(path string) (*sqlx.DB, error) {
 	if _, err = db.Exec("pragma foreign_keys=on; pragma journal_mode=WAL;"); err != nil {
 		return nil, fmt.Errorf("running pragma statements: %w", err)
 	}
-	if _, err = db.Exec(*c.sql_schema); err != nil {
+	if _, err = db.Exec(*c.sqlSchema); err != nil {
 		return nil, fmt.Errorf("creating schema: %w", err)
 	}
 
@@ -79,18 +79,18 @@ func (c DBConfig) CheckAndUpdateVersion(db *sqlx.DB) error {
 		return fmt.Errorf("couldn't check database version: %w", err)
 	}
 
-	if version > c.version_number {
-		return VersionMismatchError{c.version_number, version}
+	if version > c.versionNumber {
+		return VersionMismatchError{c.versionNumber, version}
 	}
 
-	if c.version_number > version {
+	if c.versionNumber > version {
 		fmt.Print(textutils.ColorYellow)
 		fmt.Printf("================================================\n")
 		fmt.Printf("Database version is out of date.  Upgrading database from version %d to version %d!\n", version,
-			c.version_number)
+			c.versionNumber)
 		fmt.Print(textutils.ColorReset)
 
-		for i := version; i < c.version_number; i++ {
+		for i := version; i < c.versionNumber; i++ {
 			m := (*c.migrations)[i]
 			if err := m.Apply(db); err != nil {
 				return fmt.Errorf("migration %d: %w", m.ID, err)
@@ -103,7 +103,7 @@ func (c DBConfig) CheckAndUpdateVersion(db *sqlx.DB) error {
 
 		fmt.Print(textutils.ColorGreen)
 		fmt.Printf("================================================\n")
-		fmt.Printf("Database version has been upgraded to version %d.\n", c.version_number)
+		fmt.Printf("Database version has been upgraded to version %d.\n", c.versionNumber)
 		fmt.Print(textutils.ColorReset)
 	}
 

pkg/db/connect_test.go

@@ -15,17 +15,17 @@ import (
 func TestCreateAndConnectToDB(t *testing.T) {
 	assert := assert.New(t)
 
-	_schema_sql, err := os.ReadFile("../../sample_data/test_schemas/food.sql")
+	_schemaSQL, err := os.ReadFile("../../sample_data/test_schemas/food.sql")
 	require.NoError(t, err)
-	schema_sql := string(_schema_sql)
+	schemaSQL := string(_schemaSQL)
 	migrations := []db.Migration{}
 
-	config := db.Init(&schema_sql, &migrations)
+	config := db.Init(&schemaSQL, &migrations)
 
-	data_dir := "../../sample_data/data"
-	_ = os.MkdirAll(data_dir, os.FileMode(0o644))
+	dataDir := "../../sample_data/data"
+	_ = os.MkdirAll(dataDir, os.FileMode(0o644))
 	// Create then connect to a new empty DB
-	dbPath := filepath.Join(data_dir, "test.db")
+	dbPath := filepath.Join(dataDir, "test.db")
 	_ = os.Remove(dbPath) // Delete it if it exists
 
 	_, err = config.Create(dbPath)
@@ -38,18 +38,18 @@ func TestVersionUpgrade(t *testing.T) {
 	require := require.New(t)
 
 	// Create a little schema
-	initial_schema := `
+	initialSchema := `
 		create table items(rowid integer primary key);
 		create table db_version (version integer primary key) strict, without rowid;
 		insert into db_version values(0);
 	`
 	migrations := []db.Migration{}
-	config := db.Init(&initial_schema, &migrations)
+	config := db.Init(&initialSchema, &migrations)
 
 	connection, err := config.Create(":memory:")
 	require.NoError(err)
 
-	get_version := func(c *sqlx.DB) (ret int) {
+	getVersion := func(c *sqlx.DB) (ret int) {
 		// TODO: this should be a function exposed by the `db` package itself
 		require.NoError(c.Get(&ret, "select version from db_version"))
 		return
@@ -58,21 +58,21 @@ func TestVersionUpgrade(t *testing.T) {
 	var items []int
 	require.NoError(connection.Select(&items, "select * from items"))
 	require.Len(items, 0)
-	require.Equal(0, get_version(connection))
+	require.Equal(0, getVersion(connection))
 
 	// Create a migration to add a new Item
 	migrations = append(migrations, db.Migration{ID: 1, SQL: "insert into items (rowid) values (1)"})
-	config = db.Init(&initial_schema, &migrations) // Reinitialize with the new migration
+	config = db.Init(&initialSchema, &migrations) // Reinitialize with the new migration
 	require.NoError(config.CheckAndUpdateVersion(connection))
 
 	var items2 []int
 	require.NoError(connection.Select(&items2, "select * from items"))
 	require.Len(items2, 1)
-	require.Equal(1, get_version(connection))
+	require.Equal(1, getVersion(connection))
 
 	// Create a migration to add a new Item
 	migrations = append(migrations, db.Migration{ID: 2, SQL: `alter table items add column name string default 'asdf'`})
-	config = db.Init(&initial_schema, &migrations) // Reinitialize with the new migration
+	config = db.Init(&initialSchema, &migrations) // Reinitialize with the new migration
 	require.NoError(config.CheckAndUpdateVersion(connection))
 
 	var items3 []struct {
@@ -82,5 +82,5 @@ func TestVersionUpgrade(t *testing.T) {
 	require.NoError(connection.Select(&items3, "select * from items"))
 	require.Len(items2, 1)
 	assert.Equal(t, "asdf", items3[0].Name)
-	require.Equal(2, get_version(connection))
+	require.Equal(2, getVersion(connection))
 }

pkg/db/migration_test.go

@@ -39,9 +39,9 @@ func assertForeignKeysAreGood(t *testing.T, conn *sqlx.DB) {
 	t.Helper()
 
 	// FKs should be enabled and intact at all times
-	var fkEnabled bool
-	require.NoError(t, conn.Get(&fkEnabled, `pragma foreign_keys`))
-	assert.True(t, fkEnabled)
+	var isFkEnabled bool
+	require.NoError(t, conn.Get(&isFkEnabled, `pragma foreign_keys`))
+	assert.True(t, isFkEnabled)
 	assert.NoError(t, db.PragmaForeignKeyCheck(conn))
 
 	// ...and enforcement should be in effect again, not merely reported as on

pkg/db/vsc.go

@@ -0,0 +1,51 @@
+package db
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+	"strings"
+)
+
+const separator = "\x1f"
+
+type VSC []string
+
+// MarshalJSON replaces `nil` with `[]` for hygiene.
+func (vs VSC) MarshalJSON() ([]byte, error) {
+	if vs == nil {
+		vs = VSC{}
+	}
+	return json.Marshal([]string(vs))
+}
+
+func (vs VSC) Value() (driver.Value, error) {
+	fields := make([]string, len(vs))
+	for i, v := range vs {
+		fields[i] = strings.ReplaceAll(v, separator, "")
+	}
+	return strings.Join(fields, separator), nil
+}
+
+var ErrWrongVSCType = errors.New("incompatible DB type for VSC")
+
+func (vs *VSC) Scan(src any) error {
+	var s string
+	switch v := src.(type) {
+	case string:
+		s = v
+	case []byte:
+		s = string(v)
+	case nil:
+		*vs = nil
+		return nil
+	default:
+		return ErrWrongVSCType
+	}
+	if s == "" {
+		*vs = VSC{}
+		return nil
+	}
+	*vs = strings.Split(s, separator)
+	return nil
+}

pkg/db/vsc_test.go

@@ -0,0 +1,48 @@
+package db_test
+
+import (
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/stretchr/testify/require"
+
+	"git.offline-twitter.com/offline-labs/gas-stack/pkg/db"
+)
+
+func TestVSCDBRoundTrip(t *testing.T) {
+	conn, err := sqlx.Open("sqlite3", ":memory:")
+	require.NoError(t, err)
+	t.Cleanup(func() { require.NoError(t, conn.Close()) })
+
+	_, err = conn.Exec(`create table vsc_items (id integer primary key, items text not null)`)
+	require.NoError(t, err)
+
+	type vscRow struct {
+		ID    int    `db:"id"`
+		Items db.VSC `db:"items"`
+	}
+
+	for _, want := range []vscRow{
+		{ID: 1, Items: db.VSC{"email"}},
+		{ID: 2, Items: db.VSC{"email", "profile"}},
+		{ID: 3, Items: db.VSC{}},
+	} {
+		_, err = conn.NamedExec(`insert into vsc_items (id, items) values (:id, :items)`, want)
+		require.NoError(t, err)
+
+		var got vscRow
+		require.NoError(t, conn.Get(&got, `select id, items from vsc_items where id = ?`, want.ID))
+		require.Equal(t, want, got)
+	}
+	t.Run("nil gets upgrade to empty list", func(t *testing.T) {
+		want := vscRow{ID: 4, Items: nil}
+		_, err = conn.NamedExec(`insert into vsc_items (id, items) values (:id, :items)`, want)
+		require.NoError(t, err)
+
+		var got vscRow
+		require.NoError(t, conn.Get(&got, `select id, items from vsc_items where id = ?`, want.ID))
+		require.NotNil(t, got.Items)
+		require.Equal(t, db.VSC{}, got.Items)
+	})
+}

pkg/generic/mutexmap.go

@@ -0,0 +1,76 @@
+package generic
+
+import (
+	"maps"
+	"sync"
+)
+
+type MutexMap[K comparable, V any] struct {
+	mu       sync.RWMutex
+	contents map[K]V
+}
+
+func NewMutexMap[K comparable, V any]() *MutexMap[K, V] {
+	return &MutexMap[K, V]{contents: make(map[K]V)}
+}
+
+func (m *MutexMap[K, V]) Set(key K, value V) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.contents[key] = value
+}
+
+func (m *MutexMap[K, V]) Get(key K) (V, bool) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	v, ok := m.contents[key]
+	return v, ok
+}
+
+func (m *MutexMap[K, V]) Len() int {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return len(m.contents)
+}
+
+// Upd atomically updates the value for key.  `fn` is used to determine how to update an existing
+// value, if there is one.  It will be passed the existing value, and should return `(newValue V, shouldReplace bool)`.
+//
+// Returns the value that ends up associated with key after the call and whether an update occurred.
+func (m *MutexMap[K, V]) Upd(key K, fn func(prev V) (next V, shouldReplace bool)) (V, bool) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	prev := m.contents[key]
+	if next, shouldReplace := fn(prev); shouldReplace {
+		m.contents[key] = next
+		return next, true
+	}
+	return prev, false
+}
+
+// Del removes key from the map. Returns true if the key was present.
+func (m *MutexMap[K, V]) Del(key K) bool { //nolint: boolnames // Return value is incidental, not the main purpose of the function
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if _, ok := m.contents[key]; !ok {
+		return false
+	}
+	delete(m.contents, key)
+	return true
+}
+
+func (m *MutexMap[K, V]) Cpy() map[K]V {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	cp := make(map[K]V, len(m.contents))
+	maps.Copy(cp, m.contents)
+	return cp
+}
+
+func (m *MutexMap[K, V]) Pop(key K) (ret V, isOk bool) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	ret, isOk = m.contents[key]
+	delete(m.contents, key)
+	return
+}

pkg/must/must.go

@@ -16,8 +16,8 @@ func Get[T any](val T, err error) T {
 	return val
 }
 
-func Be(condition bool, msg string, args ...any) {
-	if !condition {
+func Be(ok bool, msg string, args ...any) {
+	if !ok {
 		panic(fmt.Errorf(msg, args...)) //nolint:err113 // not a returned error
 	}
 }

pkg/schema/lint/checks.go

@@ -114,8 +114,8 @@ var Checks = []Check{
 					}
 
 					// Check if target column is a primary key
-					for _, target_col := range s.Tables[column.ForeignKeyTargetTable].Columns {
-						if target_col.Name == column.ForeignKeyTargetColumn && target_col.IsPrimaryKey {
+					for _, targetCol := range s.Tables[column.ForeignKeyTargetTable].Columns {
+						if targetCol.Name == column.ForeignKeyTargetColumn && targetCol.IsPrimaryKey {
 							continue fk_loop
 						}
 					}
@@ -125,8 +125,8 @@ var Checks = []Check{
 						if idx.TableName != column.ForeignKeyTargetTable {
 							continue
 						}
-						for _, idx_col_name := range idx.Columns {
-							if column.ForeignKeyTargetColumn == idx_col_name {
+						for _, idxColName := range idx.Columns {
+							if column.ForeignKeyTargetColumn == idxColName {
 								continue fk_loop
 							}
 							break // Only look at 1st column

pkg/schema/lint/checks_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestFailureCases(t *testing.T) {
-	test_cases := []struct {
+	testCases := []struct {
 		sqlFile          string
 		expectedFailures []string
 	}{
@@ -34,24 +34,24 @@ func TestFailureCases(t *testing.T) {
 		}},
 	}
 
-	for _, test_case := range test_cases {
-		t.Run(test_case.sqlFile, func(t *testing.T) {
-			schema, err := schema.SchemaFromSQLFile(test_case.sqlFile)
+	for _, testCase := range testCases {
+		t.Run(testCase.sqlFile, func(t *testing.T) {
+			schema, err := schema.SchemaFromSQLFile(testCase.sqlFile)
 			require.NoError(t, err)
 
 			for _, check := range lint.Checks {
 				results := check.Execute(schema)
 
-				is_failure := len(results) > 0
-				is_failure_expected := slices.Contains(test_case.expectedFailures, check.Name)
+				isFailure := len(results) > 0
+				isFailureExpected := slices.Contains(testCase.expectedFailures, check.Name)
 
-				if is_failure != is_failure_expected {
-					if is_failure_expected {
-						t.Errorf("Expected check '%s' to fail, but it passed: %s", check.Name, test_case.sqlFile)
+				if isFailure != isFailureExpected {
+					if isFailureExpected {
+						t.Errorf("Expected check '%s' to fail, but it passed: %s", check.Name, testCase.sqlFile)
 					} else {
 						t.Errorf("Expected check '%s' to pass, but it failed: %s (%q.%q)",
 							check.Name,
-							test_case.sqlFile,
+							testCase.sqlFile,
 							results[0].TableName, results[0].ColumnName,
 						)
 					}

pkg/schema/parse.go

@@ -15,12 +15,12 @@ import (
 )
 
 //go:embed views.sql
-var create_views string
+var createViews string
 
 // InitDB creates an in-memory DB from a given schema string.
-func InitDB(sql_schema string) *sqlx.DB {
+func InitDB(sqlSchema string) *sqlx.DB {
 	db := sqlx.MustOpen("sqlite3", ":memory:")
-	db.MustExec(sql_schema)
+	db.MustExec(sqlSchema)
 	return db
 }
 
@@ -35,7 +35,7 @@ func SchemaFromSQLFile(filepath string) (Schema, error) {
 // SchemaFromDB takes a DB connection, checks its schema metadata tables, and returns a Schema.
 func SchemaFromDB(db *sqlx.DB) Schema {
 	ret := Schema{Tables: map[string]Table{}, Indexes: map[string]Index{}}
-	db.MustExec(create_views)
+	db.MustExec(createViews)
 
 	var tables []Table
 	must.Do(db.Select(&tables, `select name, table_type, is_strict, is_without_rowid from tables`))

pkg/schema/parse_test.go

@@ -12,15 +12,15 @@ import (
 
 func TestParseSchema(t *testing.T) {
 	assert := assert.New(t)
-	schema_sql, err := os.ReadFile("../../sample_data/test_schemas/food.sql")
+	schemaSQL, err := os.ReadFile("../../sample_data/test_schemas/food.sql")
 	require.NoError(t, err)
 
-	db := schema.InitDB(string(schema_sql))
+	db := schema.InitDB(string(schemaSQL))
 	schema := schema.SchemaFromDB(db)
-	expected_tbls := []string{"food_types", "foods", "units", "ingredients", "recipes", "iterations", "db_version"}
-	for _, tbl_name := range expected_tbls {
-		_, is_ok := schema.Tables[tbl_name]
-		assert.True(is_ok)
+	expectedTbls := []string{"food_types", "foods", "units", "ingredients", "recipes", "iterations", "db_version"}
+	for _, tblName := range expectedTbls {
+		_, isOk := schema.Tables[tblName]
+		assert.True(isOk)
 	}
 
 	foods := schema.Tables["foods"]
@@ -57,23 +57,23 @@ func TestParseSchema(t *testing.T) {
 	// -------
 
 	// Unique index
-	units_name_idx, isOk := schema.Indexes["sqlite_autoindex_units_1"]
+	unitsNameIdx, isOk := schema.Indexes["sqlite_autoindex_units_1"]
 	require.True(t, isOk)
-	assert.True(units_name_idx.IsUnique)
-	assert.Equal("units", units_name_idx.TableName)
-	assert.Equal([]string{"name"}, units_name_idx.Columns)
+	assert.True(unitsNameIdx.IsUnique)
+	assert.Equal("units", unitsNameIdx.TableName)
+	assert.Equal([]string{"name"}, unitsNameIdx.Columns)
 
 	// Non-unique, declared index
-	foods_protein_idx, isOk := schema.Indexes["foods_protein"]
+	foodsProteinIdx, isOk := schema.Indexes["foods_protein"]
 	require.True(t, isOk)
-	assert.False(foods_protein_idx.IsUnique)
-	assert.Equal("foods", foods_protein_idx.TableName)
-	assert.Equal([]string{"protein"}, foods_protein_idx.Columns)
+	assert.False(foodsProteinIdx.IsUnique)
+	assert.Equal("foods", foodsProteinIdx.TableName)
+	assert.Equal([]string{"protein"}, foodsProteinIdx.Columns)
 
 	// Multi-column index
-	ingr_seq_idx, isOk := schema.Indexes["sqlite_autoindex_ingredients_1"]
+	ingrSeqIdx, isOk := schema.Indexes["sqlite_autoindex_ingredients_1"]
 	require.True(t, isOk)
-	assert.True(ingr_seq_idx.IsUnique)
-	assert.Equal("ingredients", ingr_seq_idx.TableName)
-	assert.Equal([]string{"in_recipe_id", "list_order"}, ingr_seq_idx.Columns)
+	assert.True(ingrSeqIdx.IsUnique)
+	assert.Equal("ingredients", ingrSeqIdx.TableName)
+	assert.Equal([]string{"in_recipe_id", "list_order"}, ingrSeqIdx.Columns)
 }

pkg/schema/table.go

@@ -76,3 +76,21 @@ func (t Table) HasSoftDelete() bool {
 	}
 	return hasIsDeleted && hasDeletedAt
 }
+
+// GetUpdateableColumns returns the columns that should be written to by an "update" operation.
+func (t Table) GetUpdateableColumns() (ret []Column) {
+	hasCreatedAt, _ := t.HasAutoTimestamps()
+	for _, col := range t.Columns {
+		if col.Name == "rowid" || col.IsPrimaryKey {
+			continue // Rowid / primary key is never updateable
+		}
+		if col.Name == "created_at" && hasCreatedAt {
+			continue // Update shouldn't write `created_at`
+		}
+		if t.HasSoftDelete() && (col.Name == "is_deleted" || col.Name == "deleted_at") {
+			continue // Soft-delete state is managed by SoftDeleteXyz(), not by updates
+		}
+		ret = append(ret, col)
+	}
+	return
+}

pkg/schema/table_test.go

@@ -0,0 +1,34 @@
+package schema
+
+import "testing"
+
+func TestTableGetUpdateableColumns(t *testing.T) {
+	tbl := Table{
+		Columns: []Column{
+			{Name: "rowid"},
+			{Name: "version", Type: "integer", IsPrimaryKey: true},
+			{Name: "created_at", Type: "integer"},
+			{Name: "updated_at", Type: "integer"},
+			{Name: "is_deleted", Type: "integer"},
+			{Name: "deleted_at", Type: "integer"},
+			{Name: "owner_id", Type: "integer", IsForeignKey: true},
+			{Name: "name", Type: "text"},
+		},
+	}
+
+	gotColumns := tbl.GetUpdateableColumns()
+	got := make([]string, 0, len(gotColumns))
+	for _, col := range gotColumns {
+		got = append(got, col.Name)
+	}
+
+	want := []string{"updated_at", "owner_id", "name"}
+	if len(got) != len(want) {
+		t.Fatalf("GetUpdateableColumns() = %v, want %v", got, want)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("GetUpdateableColumns() = %v, want %v", got, want)
+		}
+	}
+}