context.read<UserRepository>()

Question

问题

每当我尝试访问

/auth

 端点时，我都会收到 

Internal Server Error

 并收到此错误，即使其他端点按预期工作：

ERROR - 2023-12-24 00:21:23.309836
POST /auth
Error thrown by handler.
Bad state: context.read<UserRepository>() called with a request context that does not contain a UserRepository.
 
This can happen if UserRepository was not provided to the request context:
  ```dart
  // _middleware.dart
  Handler middleware(Handler handler) {
    return handler.use(provider<T>((context) => UserRepository());
  }
  ```
 package:dart_frog/src/context.dart 29:7  RequestContext.read
 routes\auth\index.dart 25:24             _authUser

从错误消息来看，问题似乎是

repo

无法访问依赖项，我已经记录了其余的代码以尝试理解为什么会发生这种情况，但似乎唯一的问题来自该行代码，这里是“/auth”端点使用的所有引用代码，请不要关注 JSON 响应：

路由/auth/index.dart

import 'dart:io';

import 'package:dart_frog/dart_frog.dart';
import 'package:test_dart_frog_server/user_repository.dart';

Future<Response> onRequest(RequestContext context) async {
  return switch (context.request.method) {
    HttpMethod.post => _authUser(context),
    _ => Future.value(Response(body: 'This is default'))
  };
}

Future<Response> _authUser(RequestContext context) async {
  final json = (await context.request.json()) as Map<String, dynamic>;
  
  final username = json['username'] as String?;
  final password = json['password'] as String?;

  if (username == null || password == null) {
    return Response.json(
      body: {'message': 'Username or password not the same!'},
      statusCode: HttpStatus.badRequest,
    );
  }
  final repo = context.read<UserRepository>();
  final user = await repo.authUser(username: username, password: password);

  return Response.json(
    body: {'user': user},
  );
}

lib/user_repository.dart //authUser()方法

Future<User?> authUser(
      {required String username, required String password}) async {
    final user = await _db.user.findFirst(
      where: UserWhereInput(
        username: StringFilter(equals: username),
        password: StringFilter(equals: _hashPassword(password)),
      ),
    );
    return user;
  }

注意：我对 dart_frog 和后端总体来说是新手，如果需要，我也可以共享 Github 存储库。

Answer 1

我找到了解决方案！

repo

 无法访问依赖项，因为 

_middleware

 不是全局的。
这可以通过使 

_middleware

 全局化或像我一样向 

middleware

 添加另一个 

/auth

 来解决：

运行此命令为
1. /auth

    创建一个新的中间件。

dart_frog new middleware "/auth"

在那里提供所需的依赖项。