HAS_ONE，belongs_to的和create_before在軌

Question

我創建2個模型支架：

1. 問題
2. 記者

我要創建1名記者的每個問題，並使用before_create用於創建記者。

我通過整數類型在數據庫中的問題表中生成reporter_id。 下面的代碼顯示的問題，記者的行動和型號：

problem.rb

class Problem < ActiveRecord::Base 
    has_one :reporter 
    before_create :build_reporter 
end 

reporter.rb

class Reporter < ActiveRecord::Base 

    belongs_to :problem 

end 

problems_controller.rb

class ProblemsController < ApplicationController 

    before_action :set_problem, only: [:show, :edit, :update, :destroy] 

    def index 
    @problems = Problem.all 
    end 

    def show 
    end 

    def new 
    @problem = Problem.new 
    end 

    def edit 
    end 

    def create 
    @problem = Problem.new(problem_params) 

    respond_to do |format| 
     if @problem.save 
     format.html { redirect_to @problem, notice: 'Problem was successfully created.' } 
     format.json { render action: 'show', status: :created, location: @problem } 
     else 
     format.html { render action: 'new' } 
     format.json { render json: @problem.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    def update 
    respond_to do |format| 
     if @problem.update(problem_params) 
     format.html { redirect_to @problem, notice: 'Problem was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render action: 'edit' } 
     format.json { render json: @problem.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    def destroy 
    @problem.destroy 
    respond_to do |format| 
     format.html { redirect_to problems_url } 
     format.json { head :no_content } 
    end 
    end 

私人 高清set_problem @問題= Problem.find（PARAMS [：ID]） 端

def problem_params 
    params.require(:problem).permit(:reporter_id, :describe_id, :datetime, :trace_code, :status) 
end 

端

reporter_controller.rb

class ReportersController < ApplicationController 
    before_action :set_reporter, only: [:show, :edit, :update, :destroy] 

    def index 
    @reporters = Reporter.all 
    end 

    def show 
    end 

    def new 
    @reporter = Reporter.new 
    end 

    def edit 
    end 

    def update 
    respond_to do |format| 
     if @reporter.update(reporter_params) 
     format.html { redirect_to @reporter, notice: 'Reporter was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render action: 'edit' } 
     format.json { render json: @reporter.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    def destroy 
    @reporter.destroy 
    respond_to do |format| 
     format.html { redirect_to reporters_url } 
     format.json { head :no_content } 
    end 
    end 

    private 
    def set_reporter 
     @reporter = Reporter.find(params[:id]) 
    end 

    def reporter_params 
     params.require(:reporter).permit(:user_name, :gomrok_name, :phone_number) 
    end 
end 

當我選擇在本地主機的新問題按鈕：3000 /問題， textfields顯示，但是當完成textfield並選擇創建問題按鈕，我得到這個錯誤：

ActiveRecord::UnknownAttributeError in ProblemsController#create 


unknown attribute: problem_id 
Extracted source (around line #31): 


respond_to do |format| 
    if @problem.save 
    format.html { redirect_to @problem, notice: 'Problem was successfully created.' } 
    format.json { render action: 'show', status: :created, location: @problem } 
    else 

什麼是problem_id？！

我沒有使用這個。

我想在數據庫的問題表中設置記者ID;我如何使用before_create或after_create創建記者，並將問題表中的reporter_id保存起來？

Answer 1

您已經錯誤地設置了關係。您所擁有的是problems表中的reporter_id列。在1-1關係foreign_key創建在belongs_to一側。所以，你的代碼應該是這樣的：

class Problem < ActiveRecord::Base 
    belongs_to :reporter 
end 

class Reporter < ActiveRecord::Base  
    has_one :problem 
    before_create :build_problem 
end