codegen: add unique index lookup funcs

pkg/schema/table.go

@@ -41,7 +41,23 @@ func (c Column) GoFieldName() string {
 	return textutils.SnakeToCamel(c.Name)
 }
 
-func (c Column) GoType() string {
+// GoVarName returns the name of a local variable for this column, e.g., when used as a function parameter.
+func (c Column) GoVarName() string {
+	if c.Name == "rowid" {
+		return strings.ToLower(c.TableName)[0:1] + "ID"
+		// TODO: Or should it just be "id"??
+	}
+	// For foreign keys, use first letter of the target type and "ID".  "UserID" => "uID"
+	if c.IsNonCodeTableForeignKey() {
+		return strings.ToLower(c.ForeignKeyTargetTable)[0:1] + "ID"
+	}
+
+	// Otherwise, just lowercase the field name
+	fieldname := c.GoFieldName()
+	return strings.ToLower(fieldname)[0:1] + fieldname[1:]
+}
+
+func (c Column) GoTypeName() string {
 	if c.IsNonCodeTableForeignKey() {
 		return TypenameFromTablename(c.ForeignKeyTargetTable) + "ID"
 	}
@@ -101,6 +117,15 @@ func (t Table) PrimaryKeyColumns() []Column {
 	return pks
 }
 
+func (t Table) GetColumnByName(name string) Column {
+	for _, c := range t.Columns {
+		if c.Name == name {
+			return c
+		}
+	}
+	panic("no such column: " + name)
+}
+
 func (t Table) HasAutoTimestamps() (hasCreatedAt bool, hasUpdatedAt bool) {
 	for _, c := range t.Columns {
 		if c.Name == "created_at" && c.Type == "integer" {