Question

我是新手学习Rails 3并完成Q＆amp; A应用教程。我只是想知道为什么我不能这样做（我得到一个错误）将特定答案与问题联系起来。它适用于当前用户......

class AnswersController < ApplicationController

before_filter :auth, only: [:create]

def create
    @question = Question.find(params[:question_id])
    **@answer = Answer.new(params[:answer])
    @answer.question = @question
    @answer.user = current_user**
    if @answer.save
        flash[:success] = 'Your answer has been posted!'
        redirect_to @question
    else
        @question = Question.find(params[:question_id])
        render 'questions/show'
    end
end
end

教程说这是正确的方法：

class AnswersController < ApplicationController

before_filter :auth, only: [:create]

def create
    @question = Question.find(params[:question_id])
    **@answer = @question.answers.build(params[:answer])**
    @answer.user = current_user
    if @answer.save
        flash[:success] = 'Your answer has been posted!'
        redirect_to @question
    else
        @question = Question.find(params[:question_id])
        render 'questions/show'
    end
end
end

Answer 1

执行以下操作

@answer = @question.answers.build(params[:answer)

与此相同

@answer = Answer.new(params[:answer])
@answer.question_id = @question.id

执行build会将关系属性添加到新答案中，在本例中为question_id

至于错误，你能提供你收到的错误类型吗？

Ruby on Rails，关联两个实例的正确方法是什么？

1 个答案: