Question

如何在帖子#show中显示所有评论？ comments_controller

divOffset

型号：

#app/controllers/comments_controller.rb
class CommentsController < ApplicationController

   def create
       @comment = Comment.new(comment_params)
       @post = Post.find(params[:post_id])
       @comment.user_id = current_user.id
       @comment.username = current_user.username
       @comment.post_id=@post.id
       @comment.save
       redirect_to post_path(@post)
   end
   def show
      @comment = Comment.find(params[:id])
   end
   def comment_params
      params.require(:comment).permit(:text, :username)
   end
end

views / posts / show.html.erb

#app/models/user.rb
class User < ActiveRecord::Base
   has_many :posts
   has_many :comments
end

#app/models/post.rb
class Post < ActiveRecord::Base
   belongs_to :user 
   has_many :comments
end

#app/models/comment.rb
class Comment < ActiveRecord::Base
   belongs_to :user
   belongs_to :post
end

Answer 1

在你的帖子中#show action只做：

@post = Post.find(params[:id])
@comments = @post.comments

然后在你的视图中添加：

<% @comments.each do |comment| %>
  <%= comment.text %>
  <br />
<% end %>

Answer 2

首先修复你的帖子控制器。 show动作应如下所示：

class PostsController < ApplicationController

  def show
    @post = Post.find(params[:id])
    @comments = @post.comments.includes(:user)   
  end

end

现在在app / views / posts / show.html.erb中，我会渲染一个部分：

<ul>
    <%= render @comments %>
</ul>

Rails会在app / views / comments / _comment.html.erb中寻找部分内容。您可以将所有注释视图逻辑放在那里，并显示所有注释：

# app/views/comments/_comment.html.erb
<li>
  <%= comment.text %>
  <br>
  <%= comment.user.try(:username) %>
</li>

最后，我会在评论控制器中修复你的创建动作：

class CommentsController < ApplicationController

  def create
    # First get the parent post:
    @post = Post.find(params[:post_id])

    # Then build the associated model through the parent (this will give it the correct post_id)
    @comment = @post.comments.build(comment_params)

    # Assign the user directly
    @comment.user = current_user

    if @comment.save
      redirect_to post_path(@post)
    else
      render :new
    end
  end
end

在我看来，您不需要在评论模型上存储用户名属性，因为这应该通过comment.user关联提供。

如何在rails中显示用户注释

2 个答案: