Ruby on Rails：我无法创建新用户

debugcn 发表于 Dev

牧野正成

当我使用$ curl -X POST '{"user": {"name": "hogehoge", "email": "[email protected]", "icon_url": "hogehoge", "location": "hogehgoe", "password": "hogehoge"}}' localhost:3000/v1/users我的应用程序目录发送到终端以创建新用户时，出现错误。

{
  "status": 400,
  "error": "Bad Request",
  "exception": "#<ActionController::ParameterMissing: param is missing or the value is empty: user>",
  ・・・
  ・・・
  ・・・
}

在服务器日志

Started POST "/v1/users" for 127.0.0.1 at 2018-12-11 16:55:56 +0900
Processing by V1::UsersController#create as JSON
  Parameters: {"name"=>"hogehoge", "email"=>"[email protected]", "icon_url"=>"hogehoge", "location"=>"hogehoge", "password"=>"[FILTERED]"}
Completed 400 Bad Request in 1ms



ActionController::ParameterMissing (param is missing or the value is empty: user):

app/controllers/v1/users_controller.rb:52:in `user_params'
app/controllers/v1/users_controller.rb:20:in `create'

我认为 user_params 对正确的参数感到满意，但事实并非如此。

这是我的 user_controller.rb

module V1
  class UsersController < ApiController
    before_action :set_user, only: [:show, :update, :destroy]
    skip_before_action :authenticate_user_from_token!, only: [:show, :index, :create]



    # POST /users
    def create
      @user = User.new(user_params)

      if @user.save
        render json: @user, serializer: V1::UserSerializer
      else
        render json: @user.errors, status: :unprocessable_entity
      end
    end


    private
    # Use callbacks to share common setup or constraints between actions.
    def set_user
      @user = User.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def user_params
      params.require(:user).permit(:name, :email, :location, :icon_url, :password)
      p params
    end
  end
end

为什么 HTTP 向我发送了 400 错误的状态代码？

正如你所说，我将这个 JSON 参数发送到终端localhost:3000/v1/users。

{
 "user": 
    {
    "name": "hogehoge",
    "email": "[email protected]",
    "icon_url": "hogehoge",
    "location": "hogehoge",
    "password": "hogehoge"
    }
}

但是现在 HTTP 状态向我发送了 500 个内部服务器错误。这是一个新的错误代码。

Started POST "/v1/users" for 127.0.0.1 at 2018-12-11 17:33:50 +0900
Processing by V1::UsersController#create as JSON
  Parameters: {"user"=>{"name"=>"hogehoge", "email"=>"[email protected]", "icon_url"=>"hogehoge", "location"=>"hogehoge", "password"=>"[FILTERED]"}}
<ActionController::Parameters {"user"=><ActionController::Parameters {"name"=>"hogehoge", "email"=>"[email protected]", "icon_url"=>"hogehoge", "location"=>"hogehoge", "password"=>"hogehoge"} permitted: false>, "format"=>:json, "controller"=>"v1/users", "action"=>"create"} permitted: false>
Completed 500 Internal Server Error in 34ms (ActiveRecord: 2.0ms)



ActiveModel::ForbiddenAttributesError (ActiveModel::ForbiddenAttributesError):

app/controllers/v1/users_controller.rb:20:in `create'

像素地球

看起来您在 #user_params 中留下了调试代码，因此它不会返回正确的对象：

# Only allow a trusted parameter "white list" through.
def user_params
  params.require(:user).permit(:name, :email, :location, :icon_url, :password)
  p params
end

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