Rails 5 API POST创建params为空

时间:2016-09-03 09:28:05

标签: ruby-on-rails json ruby api ruby-on-rails-5

感谢您查看此问题。我在Rails 5中构建API,并且遇到了POST创建请求的问题。

基本上,当我的API获取它们时,我的参数是空的,不知道为什么。使用Postman发送此JSON对象:

{ 
  "battle": {
    "winner_score": 300,
    "loser_score": 3,
    "winner_id": 2,
    "loser_id": 1
  }
}

这是相关的控制器:

class Api::V1::BattlesController < ApplicationController

  protect_from_forgery with: :null_session, if: Proc.new { |c| c.request.format.include? 'application/json' }
  wrap_parameters format: [:json]


  # POST /battles
  def create
    @battle = Battle.new(battle_params)

    if @battle.save
      render json: @battle, status: :created, location: @battle
    else
      render json: @battle.errors, status: :unprocessable_entity
    end
  end

  private

  # Only allow a trusted parameter "white list" through.
  def battle_params
    binding.pry
    params.permit(:winner_score, :loser_score, :winner_id, :loser_id)
  end
end

当我在battle_params方法中点击binding.pry时,params对象为nil:

    50: def battle_params
 => 51:   binding.pry
    52:   params = params.to_h
    53:   params.permit(:winner_score, :loser_score, :winner_id, :loser_id)
    54: end

    params
    => nil

My Postman请求得到一个响应,说明.permit是一个未定义的哈希方法,我也在终端中看到:

"status":500,"error":"Internal Server Error","exception":"#\u003cNoMethodError: undefined method `permit' for {}:Hash\u003e"

NoMethodError (undefined method `permit' for {}:Hash):
app/controllers/api/v1/battles_controller.rb:53:in `battle_params'

之前我还没遇到过这个问题,所以我们非常感激任何见解。

2 个答案:

答案 0 :(得分:4)

白名单需要对象类(在这种情况下是战斗)

params.require(:battle).permit(:winner_score, :loser_score, :winner_id, :loser_id)

答案 1 :(得分:0)

正如你所说,params空洞可能是因为你需要在RestClientPostman中发送标题

Content-Type : Application/JSON