fix: prisma schema generation issue with calling attribute function with literal

packages/schema/src/plugins/prisma/prisma-builder.ts

@@ -304,17 +304,10 @@ export class FunctionCall {
 }
 
 export class FunctionCallArg {
-    // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
-    constructor(public name: string | undefined, public value: any) {}
+    constructor(public name: string | undefined, public value: string) {}
 
     toString(): string {
-        const val =
-            this.value === null || this.value === undefined
-                ? 'null'
-                : typeof this.value === 'string'
-                ? `"${this.value}"`
-                : this.value.toString();
-        return this.name ? `${this.name}: ${val}` : val;
+        return this.name ? `${this.name}: ${this.value}` : this.value;
     }
 }
 

packages/schema/src/plugins/prisma/schema-generator.ts

@@ -18,7 +18,9 @@ import {
     isArrayExpr,
     isInvocationExpr,
     isLiteralExpr,
+    isNullExpr,
     isReferenceExpr,
+    isStringLiteral,
     LiteralExpr,
     Model,
     NumberLiteral,
@@ -35,6 +37,7 @@ import {
     PluginOptions,
     resolved,
     resolvePath,
+    ZModelCodeGenerator,
 } from '@zenstackhq/sdk';
 import fs from 'fs';
 import { writeFile } from 'fs/promises';
@@ -45,6 +48,7 @@ import { name } from '.';
 import { getStringLiteral } from '../../language-server/validator/utils';
 import telemetry from '../../telemetry';
 import { execSync } from '../../utils/exec-utils';
+import { getPackageJson } from '../../utils/pkg-utils';
 import {
     ModelFieldType,
     AttributeArg as PrismaAttributeArg,
@@ -62,8 +66,6 @@ import {
     PassThroughAttribute as PrismaPassThroughAttribute,
     SimpleField,
 } from './prisma-builder';
-import { ZModelCodeGenerator } from '@zenstackhq/sdk';
-import { getPackageJson } from '../../utils/pkg-utils';
 
 const MODEL_PASSTHROUGH_ATTR = '@@prisma.passthrough';
 const FIELD_PASSTHROUGH_ATTR = '@prisma.passthrough';
@@ -377,10 +379,15 @@ export default class PrismaSchemaGenerator {
         return new PrismaFunctionCall(
             resolved(node.function).name,
             node.args.map((arg) => {
-                if (!isLiteralExpr(arg.value)) {
-                    throw new PluginError(name, 'Function call argument must be literal');
-                }
-                return new PrismaFunctionCallArg(arg.name, arg.value.value);
+                const val = match(arg.value)
+                    .when(isStringLiteral, (v) => `"${v.value}"`)
+                    .when(isLiteralExpr, (v) => v.value.toString())
+                    .when(isNullExpr, () => 'null')
+                    .otherwise(() => {
+                        throw new PluginError(name, 'Function call argument must be literal or null');
+                    });
+
+                return new PrismaFunctionCallArg(arg.name, val);
             })
         );
     }

packages/schema/tests/generator/prisma-builder.test.ts

@@ -102,7 +102,7 @@ describe('Prisma Builder Tests', () => {
                     undefined,
                     new AttributeArgValue(
                         'FunctionCall',
-                        new FunctionCall('dbgenerated', [new FunctionCallArg(undefined, 'timestamp_id()')])
+                        new FunctionCall('dbgenerated', [new FunctionCallArg(undefined, '"timestamp_id()"')])
                     )
                 ),
             ]),

packages/schema/tests/generator/prisma-generator.test.ts

@@ -96,6 +96,38 @@ describe('Prisma generator test', () => {
         expect(content).toContain('unsupported Unsupported("foo")');
     });
 
+    it('attribute function', async () => {
+        const model = await loadModel(`
+            datasource db {
+                provider = 'postgresql'
+                url = env('DATABASE_URL')
+            }
+
+            model User {
+                id String @id @default(nanoid(6))
+                x String @default(nanoid())
+                y String @default(dbgenerated("gen_random_uuid()"))
+            }
+        `);
+
+        const { name } = tmp.fileSync({ postfix: '.prisma' });
+        await new PrismaSchemaGenerator().generate(model, {
+            name: 'Prisma',
+            provider: '@core/prisma',
+            schemaPath: 'schema.zmodel',
+            output: name,
+            generateClient: false,
+        });
+
+        const content = fs.readFileSync(name, 'utf-8');
+        // "nanoid()" is only available in later versions of Prisma
+        await getDMMF({ datamodel: content }, '5.0.0');
+
+        expect(content).toContain('@default(nanoid(6))');
+        expect(content).toContain('@default(nanoid())');
+        expect(content).toContain('@default(dbgenerated("gen_random_uuid()"))');
+    });
+
     it('triple slash comments', async () => {
         const model = await loadModel(`
             datasource db {

packages/sdk/src/prisma.ts

@@ -81,8 +81,8 @@ export type GetDMMFOptions = {
 /**
  * Loads Prisma DMMF with appropriate version
  */
-export function getDMMF(options: GetDMMFOptions): Promise<DMMF.Document> {
-    const prismaVersion = getPrismaVersion();
+export function getDMMF(options: GetDMMFOptions, defaultPrismaVersion?: string): Promise<DMMF.Document> {
+    const prismaVersion = getPrismaVersion() ?? defaultPrismaVersion;
     if (prismaVersion && semver.gte(prismaVersion, '5.0.0')) {
         const _getDMMF = require('@prisma/internals-v5').getDMMF;
         return _getDMMF(options);