docs: nestjs guide for v3

ymc9 · ymc9 · commit 33aaf34f67ea · 2025-12-18T09:56:19.000+08:00
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diff --git a/versioned_docs/version-3.x/migrate-prisma.md b/versioned_docs/version-3.x/migrate-prisma.md
@@ -88,8 +88,8 @@ Replace `new PrismaClient()` with `new ZenStackClient(schema, ...)` where `schem
 
 ```ts title='db.ts'
 import { ZenStackClient } from '@zenstackhq/orm';
+import { PostgresDialect } from '@zenstackhq/orm/dialects/postgres';
 import { schema } from './zenstack/schema';
-import { PostgresDialect } from 'kysely';
 import { Pool } from 'pg';
 
 export const db = new ZenStackClient(schema, {
@@ -106,7 +106,7 @@ export const db = new ZenStackClient(schema, {
 
 ```ts title='db.ts'
 import { ZenStackClient } from '@zenstackhq/orm';
-import { SqliteDialect } from 'kysely';
+import { SqliteDialect } from '@zenstackhq/orm/dialects/sqlite';
 import SQLite from 'better-sqlite3';
 import { schema } from './zenstack/schema';
 
diff --git a/versioned_docs/version-3.x/orm/client.md b/versioned_docs/version-3.x/orm/client.md
@@ -26,7 +26,7 @@ The samples below only show creating a client using SQLite (via [better-sqlite3]
 
 ```ts title='db.ts'
 import { ZenStackClient } from '@zenstackhq/orm';
-import { SqliteDialect } from 'kysely';
+import { SqliteDialect } from '@zenstackhq/orm/dialects/sqlite';
 import SQLite from 'better-sqlite3';
 import { schema } from './zenstack/schema';
 
@@ -44,8 +44,8 @@ export const db = new ZenStackClient(schema, {
 
 ```ts title='db.ts'
 import { ZenStackClient } from '@zenstackhq/orm';
+import { PostgresDialect } from '@zenstackhq/orm/dialects/postgres';
 import { schema } from './zenstack/schema';
-import { PostgresDialect } from 'kysely';
 import { Pool } from 'pg';
 
 export const db = new ZenStackClient(schema, {
diff --git a/versioned_docs/version-3.x/recipe/databases/_category_.yml b/versioned_docs/version-3.x/recipe/databases/_category_.yml
@@ -1,4 +1,4 @@
-position: 1
+position: 2
 label: Databases
 collapsible: true
 collapsed: true
diff --git a/versioned_docs/version-3.x/recipe/nestjs.md b/versioned_docs/version-3.x/recipe/nestjs.md
@@ -0,0 +1,168 @@
+---
+sidebar_position: 4
+---
+
+# Using ZenStack With NestJS
+
+This guide describes different ways to use ZenStack in a [NestJS](https://nestjs.com/) application.
+
+## As a Plain ORM
+
+ZenStack offers a standard ORM component that you can use in your NestJS application just like any other ORM. To get started, create a `DbService` by extending the `ZenStackClient` constructor:
+
+```ts title="db.service.ts"
+import { ZenStackClient } from '@zenstackhq/orm';
+import { PostgresDialect } from '@zenstackhq/orm/dialects/postgres';
+import { schema, type SchemaType } from './zenstack/schema';
+import { Pool } from 'pg';
+
+export class DbService extends ZenStackClient<
+  SchemaType,
+  ClientOptions<SchemaType>
+> {
+  constructor() {
+    super(schema, {
+      dialect: new PostgresDialect({
+        pool: new Pool({ connectionString: process.env.DATABASE_URL })
+      }),
+    });
+  }
+}
+```
+
+You can then register this service as a provider in a module:
+
+```ts title="app.module.ts"
+import { Module } from '@nestjs/common';
+import { AppController } from './app.controller';
+import { DbService } from './db.service';
+
+@Module({
+  controllers: [AppController],
+  providers: [DbService],
+})
+```
+
+Finally, inject the `DbService` in your controllers or other services to access the database:
+
+```ts title="app.controller.ts"
+import { Controller, Get } from '@nestjs/common';
+import { DbService } from './db.service';
+
+@Controller('api')
+export class AppController {
+  constructor(private readonly dbService: DbService) {}
+
+  @Get('/posts')
+  getPosts() {
+    return this.dbService.post.findMany();
+  }
+}
+```
+
+## As an Access-Controlled ORM
+
+To leverage ZenStack's [built-in access control features](../orm/access-control/), you can inject a request-scoped `DbService` that's bound to the current session user (usually extracted from the request).
+
+In the sample below, we provide an access-controlled `DbService` under the name "AUTH_DB":
+
+```ts title="app.module.ts"
+import { Module, Scope } from '@nestjs/common';
+import { REQUEST } from '@nestjs/core';
+import type { Request } from 'express';
+import { PolicyPlugin } from '@zenstackhq/plugin-policy';
+import { DbService } from './db.service';
+// your authentication helper
+import { getRequestUser } from './auth.util';
+
+@Module({
+  controllers: [AppController],
+  providers: [
+    // the standard (no-access-control) ORM
+    DbService,
+
+    // the access-controlled ORM
+    {
+      provide: 'AUTH_DB',
+
+      // make sure it's request-scoped to capture per-request user context
+      scope: Scope.REQUEST,
+
+      useFactory: (req: Request, db: DbService) => {
+        // extract the current user from the request, implementation depends on
+        // your authentication solution
+        const user = getRequestUser(req);
+
+        // install the PolicyPlugin and set the current user context
+        return db.$use(new PolicyPlugin()).$setAuth(user);
+      },
+
+      inject: [REQUEST, DbService],
+    },
+  ],
+})
+```
+
+Now you can choose to use the access-controlled `DbService` in your controllers or services by injecting it with the "AUTH_DB" token:
+
+```ts title="app.controller.ts"
+import { Controller, Get, Inject } from '@nestjs/common';
+import { DbService } from './db.service';
+
+@Controller('api')
+export class AppController {
+  // inject the access-controlled DbService
+  constructor(@Inject('AUTH_DB') private readonly dbService: DbService) {}
+
+  @Get('/posts')
+  getPosts() {
+    // only posts accessible to the current user will be returned
+    return this.dbService.post.findMany();
+  }
+}
+```
+
+## As an Automatic CRUD Service
+
+ZenStack also provides [API handlers](../service/api-handler/) that process CRUD requests automatically for you. To use it, create a catch-all route in your controller and forward the request to the API handler:
+
+```ts title="app.controller.ts"
+import { Controller, All, Inject, Param, Query, Req, Res } from '@nestjs/common';
+import type { Request, Response } from 'express';
+import { DbService } from './db.service';
+
+@Controller('api')
+export class AppController {
+  // RESTful API Handler is used here for demonstration. You can also use the
+  // RPC-style API handler if preferred. See the API handlers docs for more 
+  // details.
+  private readonly apiHandler = new RestApiHandler({
+    schema,
+    endpoint: 'http://localhost:3000/api',
+  });
+
+  constructor(@Inject('AUTH_DB') private readonly dbService: DbService) {}
+
+  @All('/*path')
+  async handleAll(
+    @Req() req: Request,
+    @Res() response: Response,
+    @Param('path') path: string[],
+    @Query() query: Record<string, any>,
+  ) {
+    // forward the request to the API handler
+    const result = await this.apiHandler.handleRequest({
+      method: req.method,
+      path: path.join('/'),
+      query,
+      requestBody: req.body,
+      client: authDb,
+    });
+
+    response.status(result.status).json(result.body);
+  }
+}
+```
+
+With this setup, all requests to `/api/*` will be handled by the ZenStack API handler, which performs the necessary CRUD operations with access control enforced. Refer to the [API handlers documentation](../service/api-handler/) for request and response formats and other details.
+
diff --git a/versioned_docs/version-3.x/recipe/postgres-multi-schema.md b/versioned_docs/version-3.x/recipe/postgres-multi-schema.md
@@ -1,5 +1,5 @@
 ---
-sidebar_position: 2
+sidebar_position: 3
 ---
 
 # Working With PostgreSQL Schemas
