0

我正在使用 Rails 建立一个论坛。

当您创建一个主题时，它将具有来自主题类的名称和描述，以及来自帖子类的帖子内容......（当您创建一个主题时，您会自动创建一个包含该内容的帖子）

含义：对于每个主题，您可以有多个帖子对于每个帖子，您必须有一个主题。

出于某种原因，当我创建一个主题时，它会保存该主题的输入，但会丢弃 Post 类的输入。

我环顾 Stackoverflow 并注意到一些类似的问题，并尝试了许多答案只是为了得到错误或没有任何变化。( accepts_nested_attributes_for 不将子属性保存到数据库中，

楷模

class Topic < ActiveRecord::Base
    belongs_to :forum
    has_many :posts, :dependent => :destroy  
    belongs_to :user

    accepts_nested_attributes_for :posts
end

class Post < ActiveRecord::Base  
    belongs_to :topic  
end

控制器 - 主题

class TopicsController < ApplicationController
  before_action :set_topic, only: [:show, :edit, :update, :destroy]

  def index
    @topics = Topic.all
  end

  def new
    @topic = Topic.new
    responses = @topic.posts.build
  end

  def create  
    @topic = Topic.new(topic_params)

    if @topic.save 
      flash[:success] = "Topic Posted"
      redirect_to "/forums/#{@topic.forum_id}" 
    else  
      render :new  
    end   
  end


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

    # Never trust parameters from the scary internet, only allow the white list through.
    def topic_params
      params.require(:topic).permit(:name, :description, :last_poster_id, :last_post_at, :forum_id,
        posts_attributes: [:id, :content] )
    end
end

_形式

<%= form_for(@topic) do |f| %>
  <% if params[:forum] %>
    <input type="hidden" 
    id="topic_forum_id" 
    name="topic[forum_id]" 
    value="<%= params[:forum] %>" />
  <% end %>  

  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :description %><br>
    <%= f.text_field :description %>
  </div>

  <%= f.fields_for :responses do |p| %>

    <%= p.label :content %><br />
    <%= p.text_area :content %>

  <% end %>


  <%= f.submit :class => "btn btn-primary" %>
<% end %>
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1 回答 1

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感谢 davidfurber，我能够找出问题所在。如果其他人有同样的问题，这是解决方案。

您无需将 @topic.posts.build 分配给变量。话虽如此，您不需要 _form 视图中的响应。相反，将 :posts 放在 :responses 所在的位置。

_形式

<%= form_for(@topic) do |f| %>
  ... 
  <div class="field">
    <%= f.label :description %><br>
    <%= f.text_field :description %>
  </div>

  <%= f.fields_for :posts do |p| %>
    <%= p.label :content %><br />
    <%= p.text_area :content %>
  <% end %>

  <%= f.submit :class => "btn btn-primary" %>
<% end %>

控制器 - 主题

class TopicsController < ApplicationController
  before_action :set_topic, only: [:show, :edit, :update, :destroy]
  def new
    @topic = Topic.new
    @topic.posts.build
  end

  def create  
    # render text: topic_params and return
    @topic = Topic.new(topic_params)

    if @topic.save 
      flash[:success] = "Topic Posted"
      redirect_to "/forums/#{@topic.forum_id}" 
    else  
      render :new  
    end   
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def topic_params
      params.require(:topic).permit(:name, :description, :last_poster_id, :last_post_at, :forum_id,
        posts_attributes: [:id, :content] )
    end
end
于 2013-10-02T02:37:30.287 回答