我有一个带有 Rails API 的 React SPA。我最近更改了 React 端的 API 请求以通过 axios 而不是 jquery，我的 axios 设置是:

export default class API {
  static send(verb, resource, rawParams, callback, errcallback) {
    const params = Object.keys(rawParams).reduce((o, k) => {
      o[k] = rawParams[k];
      return o;
    }, {});

    const errorCallback = typeof errcallback === 'function' ? errcallback : () => {};

    const request = {
      method: verb,
      url: `${URL}/${resource}`
    };

    const token = window.sessionStorage.getItem('jwt');
    request.headers = {};
    if (token !== 'undefined' && token != null) {
      request.headers.Authorization = `Bearer ${token}`;
    }

    if (verb === 'GET' || verb === 'DELETE') {
      request.params = params;
      request.headers['Content-Type'] = 'application/json';
      request.headers.Accept = 'application/json';
    } else {
      request.headers['Content-Type'] = 'application/json';
      request.headers.Accept = 'application/json';
      request.data = params;
    }

    axios(request)
      .then(response => {
        if (resource === 'users/sign_in') {
          const jwt = response.headers.authorization;
          window.sessionStorage.setItem('jwt', jwt.split('Bearer ')[1]);
        } else if (resource === 'users/sign_out') {
          window.sessionStorage.removeItem('jwt');
        }
        callback(response.data);
      })
      .catch(error => {
        errorCallback(error.response.data);
      });
  }

  static baseURL() {
    return URL;
  }

  static get(resource, params, callback, errcallback) {
    API.send('GET', resource, params, callback, errcallback);
  }

  static post(resource, params, callback, errcallback) {
    API.send('POST', resource, params, callback, errcallback);
  }

  static put(resource, params, callback, errcallback) {
    API.send('PUT', resource, params, callback, errcallback);
  }

  static del(resource, params, callback, errcallback) {
    API.send('DELETE', resource, params, callback, errcallback);
  }
}

为此我创建了一个请求，例如:

API.get('user/user_auth', { validate_user: { user_type: 'gamer' } }. res => {
  ...
}

但是现在我的 Rails 端在 permit 参数中失败了。许可证定义为:

def user_type_params
  params.require(:validate_user).permit(:user_type)
end

每次我在 Rails 代码中执行类似 user_type_params[:user_type] 的操作时，我都会收到如下错误:

NoMethodError (undefined method `permit' for "{\"user_type\":\"gamer\"}":String)`

即使我添加了 request.headers['Content-Type'] = 'application/json';，它仍将其作为字符串发送。在发出请求之前是否有其他方法可以正确转换参数？

最佳答案

尝试这样的事情:

def user_type_params
  json = params.require(:validate_user)
  {user_type: JSON.parse(json).permit(:user_type)}
end

此外，您不一定需要使用许可。您可以自己将参数列入白名单。

关于ruby-on-rails - NoMethodError:未定义字符串的方法 'permit'，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54488114/