Question

此处的示例行无效。我尝试了20种。

视图/评论/ _comments.html.erb

<% @comments.each do |comment| %>
  <%= User.find(comment.user_id).name %>    # Gives user name of commenter
  <%= simple_format comment.content %>
  <%= pluralize(comment.likes, 'like') %>
  <%= link_to content_tag(:span, '', class: 'glyphicon glyphicon-thumbs-up') + 
    ' Like it', like_comment_path(:id => comment.id), method: :post %>
  <%= User.find(like.user_id).name %>       # How to get user name of liker?
<% end %>

comments_controller.rb

def like
  @comment = Comment.find(params[:id])
  comment_like = current_user.comment_likes.build(comment: @comment)
  if comment_like.save
    @comment.increment!(:likes)
    @comment.create_activity :like
    @user = User.find(params[:id])
    flash[:success] = 'Thanks for liking!'
  else
    flash[:error] = 'Two many likes'
  end  
    redirect_to(:back)
end

comment_like.rb

class CommentLike < ActiveRecord::Base
   belongs_to :comment
   belongs_to :user
   validates :user, uniqueness: { scope: :comment }
end

comment.rb

class Comment < ActiveRecord::Base
    include PublicActivity::Common
    # tracked except: :update,  owner: ->(controller, model) { controller && controller.current_user }
    has_many :comment_likes 
    has_many :likers, through: :comment_likes, class_name: 'User'
    belongs_to :commentable, polymorphic: true
    belongs_to :user
end

Answer 1

评论有很多喜欢。所以你正在寻找评论员。

class Comment
  has_many :comment_likes
  has_many :likers, through: :comment_likes, class_name: 'User', source: :liker
end

class CommentLikers
  belongs_to :liker, class_name: 'User', foreign_key: :user_id
  belongs_to :liked_comment, class_name: 'Comment', foreign_key: :comment_id
end

class User
  has_many :comment_likes
  has_many :liked_comments, through: :comment_likes, class_name: 'Comment', source: :liked_comment
end

然后在你的观点中：

<% @comments.each do |comment| %>
  <% comment.likers.each do |user| %>
    <%= user.name %>
  <% end %>
<% end %>

编辑1

您的问题在导轨指南中得到了很好的解释： http://guides.rubyonrails.org/association_basics.html

但只是给你一个简短的解释：

您需要通过评论将评论与用户相关联。为此，您需要告诉rails使用user_id在表中查找用户。

这就是through: :comment_likes, class: 'User'所做的。

编辑2

检查源代码以查看更多选项： http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/has_many

Answer 2

1）如果在控制器中声明了like变量，它应该是全局的：@like

2）不要使用User.find(comment.user_id).name或User.find(like.user_id).name。

像comment.user.name，@like.user.name

一样使用它

Answer 3

简短的回答

在您的控制器中，更改

  comment_like = current_user.comment_likes.build(comment: @comment)
  if comment_like.save

与

  @comment_like = current_user.comment_likes.build(comment: @comment)
  if @comment_like.save

在您看来，更改

<%= User.find(like.user_id).name %>

与

<%= @comment_like.user.name %>

如何获得Liker的用户名？

3 个答案: