Add support for generated identifier format strings (id prefixing).

packages/language/res/stdlib.zmodel

@@ -83,25 +83,25 @@ function now(): DateTime {
 /**
  * Generates a globally unique identifier based on the UUID specs.
  */
-function uuid(version: Int?): String {
+function uuid(version: Int?, format: String?): String {
 } @@@expressionContext([DefaultValue])
 
 /**
  * Generates a globally unique identifier based on the CUID spec.
  */
-function cuid(version: Int?): String {
+function cuid(version: Int?, format: String?): String {
 } @@@expressionContext([DefaultValue])
 
 /**
  * Generates an identifier based on the nanoid spec.
  */
-function nanoid(length: Int?): String {
+function nanoid(length: Int?, format: String?): String {
 } @@@expressionContext([DefaultValue])
 
 /**
  * Generates an identifier based on the ulid spec.
  */
-function ulid(): String {
+function ulid(format: String?): String {
 } @@@expressionContext([DefaultValue])
 
 /**

packages/orm/src/client/crud/operations/base.ts

@@ -860,22 +860,34 @@ export abstract class BaseOperationHandler<Schema extends SchemaDef> {
     private evalGenerator(defaultValue: Expression) {
         if (ExpressionUtils.isCall(defaultValue)) {
             return match(defaultValue.function)
-                .with('cuid', () => createId())
-                .with('uuid', () =>
-                    defaultValue.args?.[0] &&
-                    ExpressionUtils.isLiteral(defaultValue.args?.[0]) &&
-                    defaultValue.args[0].value === 7
+                .with('cuid', () => this.formatGeneratedValue(createId(), defaultValue.args?.[1]))
+                .with('uuid', () => {
+                    const version = defaultValue.args?.[0] && ExpressionUtils.isLiteral(defaultValue.args[0])
+                        ? defaultValue.args[0].value
+                        : undefined;
+
+                    const generated = version === 7
                         ? uuid.v7()
-                        : uuid.v4(),
-                )
-                .with('nanoid', () =>
-                    defaultValue.args?.[0] &&
-                    ExpressionUtils.isLiteral(defaultValue.args[0]) &&
-                    typeof defaultValue.args[0].value === 'number'
-                        ? nanoid(defaultValue.args[0].value)
-                        : nanoid(),
-                )
-                .with('ulid', () => ulid())
+                        : uuid.v4();
+
+                    const format = defaultValue.args?.[1];
+
+                    return this.formatGeneratedValue(generated, format);
+                })
+                .with('nanoid', () => {
+                    const length = defaultValue.args?.[0] && ExpressionUtils.isLiteral(defaultValue.args[0])
+                        ? defaultValue.args[0].value
+                        : undefined;
+
+                    const generated = typeof length === 'number'
+                        ? nanoid(length)
+                        : nanoid();
+
+                    const format = defaultValue.args?.[1];
+
+                    return this.formatGeneratedValue(generated, format);
+                })
+                .with('ulid', () => this.formatGeneratedValue(ulid(), defaultValue.args?.[0]))
                 .otherwise(() => undefined);
         } else if (
             ExpressionUtils.isMember(defaultValue) &&
@@ -893,6 +905,19 @@ export abstract class BaseOperationHandler<Schema extends SchemaDef> {
         }
     }
 
+    private formatGeneratedValue(generated: string, expr?: Expression) {
+        if (!expr || !ExpressionUtils.isLiteral(expr)) {
+            return generated;
+        }
+
+        const format = expr.value;
+
+        invariant(typeof format === 'string', 'generated identifier format value must be a string');
+        invariant(format.includes('%s'), 'generated identifier format strings must include "%s"');
+
+        return format.replaceAll('%s', generated);
+    }
+
     protected async update(
         kysely: AnyKysely,
         model: string,