ruby-on-rails - 参数缺失或值为空 : company

Question

我正在尝试让这个 API 正常工作，但遇到了这个我不知道如何解决的错误。我在标题上收到错误。我使用了来自谷歌浏览器的 postman 扩展。并尝试执行发布请求在

localhost:3000/companies

并得到一个错误。如下图所示

ActionController::ParameterMissing in CompaniesController#create param is missing or the value is empty: company

def company_params
 (this line is highlighted) params.require(:company).permit(:name, :phone, :email, :website, :address, :customer_id, :additional_info)
end
end
   Request

Parameters:

{"name"=>"harun"}

我已经生成了一个 rails-api，添加了 avtive_model_serializer 和 rack-cors gem。为 cors 修改了 config/application。

然后为公司生成一个脚手架。

gem 文件

gem 'active_model_serializers', '~> 0.10.0'
gem 'rack-cors'

config/application.rb

config.middleware.insert_before 0, "Rack::Cors" do
  allow do
    origins '*'
    resource '*', :headers => :any, :methods => [:get, :post, :options]
  end
end

app/serializers/company_serializer.rb

class CompanySerializer < ActiveModel::Serializer
 attributes :id, :name, :phone, :email, :website, :address, :customer_id, :additional_info
end

controllers/companies_controller.rb

class CompaniesController < ApplicationController
  before_action :set_company, only: [:show, :update, :destroy]
  def index
    @companies = Company.all
    render json: @companies
  end

  def show
    render json: @company
  end

  def create
    @company = Company.new(company_params)
    if @company.save
      render json: @company, status: :created, location: @company
    else
      render json: @company.errors, status: :unprocessable_entity
    end
  end

  def update
    @company = Company.find(params[:id])

    if @company.update(company_params)
      head :no_content
    else
      render json: @company.errors, status: :unprocessable_entity
    end
  end

  def destroy
    @company.destroy

    head :no_content
  end

  private

    def set_company
      @company = Company.find(params[:id])
    end

    def company_params
      params.require(:company).permit(:name, :phone, :email, :website, :address, :customer_id, :additional_info)
    end
end

Answer 1

您正在传递参数 {"name"=>"harun"} 您需要传递 {"company"=> { "name"=>"harun"} } .

在 postman 中(如果你发送的是 json 数据)发送这个数据:

{"company":{"name":"harun"}}

如果您要发送表单数据，请发送:

company[name] = "harun"

使用强参数，当找不到所需参数时会出现错误:

params.require(:company)