向用户和Post模型Rails 4添加注释
向用户和Post模型Rails 4添加注释
提问于 2015-01-18 15:53:42
我有属于艺术家的微博，一切都很完美。
现在我试着让艺术家们对微博发表评论。不过，这不是我想要的结果。这些评论需要同时属于一个特定的艺术家和一个特定的微博。
现在，我有一个表单来创建一个评论，但它只保存在最近的微博id。
### controllers/artists/comments_controller.rb ###
class Artists::CommentsController < ApplicationController
def create
@micropost = ArtistMicropost.find_by(params[:micropost_id])
@comment = @micropost.artist_micropost_comments.build(comment_params)
@comment.artist_id = current_artist.id
end
private
def comment_params
params.require(:artist_micropost_comment).permit(:artist_micropost_id, :artist_id, :content)
end
end
### controllers/artists/artists_controller.rb ###
class Artists::ArtistsController < ApplicationController
def show
@artist = Artist.find(params[:id])
@micropost = ArtistMicropost.new
@micro = ArtistMicropost.find_by(params[:micropost_id])
@comment = ArtistMicropostComment.new
end
end
### views/artists/show.html.erb ###
<% @artist.artist_microposts.each do |micropost| %>
...
<%= micropost.content %>
...
<% @micro.artist_micropost_comments.each do |comment| %>
<%= comment.content %>
<% end %>
<%= form_for(@comment) do |f| %>
<%= f.text_area :content %>
<%= f.submit "post comment" %>
<% end %>
<% end %>
### models/artist.rb ###
class Artist < ActiveRecord::Base
has_many :artist_microposts, dependent: :destroy
has_many :artist_micropost_comments, dependent: :destroy
end
### models/artist_micropost.rb ###
class ArtistMicropost < ActiveRecord::Base
belongs_to :artist
has_many :artist_micropost_comments, dependent: :destroy
end
### models/artist_micropost_comment.rb ###
class ArtistMicropostComment < ActiveRecord::Base
belongs_to :artist_micropost
belongs_to :artist
end我希望它能显示艺术家的每一个微博，在每个微博下面显示属于微博的评论。我想要从下面显示的注释添加新的注释。基本上，我希望它看起来像Facebook。
现在，所有的评论都显示在每个微博上，不管micropost_id和create方法不会在任何micropost_id下创建，除了最近的一个。
所以我的两个问题是：
我无法将注释保存在正确的micropost_id下面
我不能让评论为他们的微博循环。
有什么想法吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2015-01-18 20:16:08
短名称更容易阅读和理解，因此我将在示例中将您的模型重命名为Artist、Micropost和Comment。
class Artist < ActiveRecord::Base
has_many :microposts, dependent: :destroy
has_many :comments, through: :microposts, dependent: :destroy
end
class Micropost < ActiveRecord::Base
belongs_to :artist
has_many :comments, dependent: :destroy
end
class Comment < ActiveRecord::Base
# I renamed artist to commenter to make it clear that is not the same artist as the one that created the micropost,
# this implies that instead of author_id you will have commented_id in comments table
belongs_to :commenter, :class_name => Artist
belongs_to :micropost
end
### views/artists/show.html.erb ###
<% @artist.microposts.each do |micropost| %>
...
<%= micropost.content %>
...
<% micropost.comments.each do |comment| %>
# here you display comments for each micropost
<%= comment.content %>
# pay attention at the way I builded the comment
<%= form_for(micropost.comments.build) do |f| %>
<%= f.hidden_field :micropost_id %> # this will make the link to your micropost
<%= f.text_area :content %>
<%= f.submit "post comment" %>
<% end %>
<% end %>
<% end %>在您的comments_controller中，您必须为您的评论指定当前登录的艺术家(批注)。
class CommentsController < ApplicationController
def create
@comment = Comment.new(comment_params)
@comment.commenter = current_artist
if @comment.save
...
end
end
private
def comment_params
params.require(:comment).permit(:micropost_id, :content)
end
end为了避免在加载艺术家、微博和评论员时使用N+1，请执行如下操作：
class ArtistsController < ApplicationController
def show
@artist = Artist.includes(:microposts, :comments => :commenter).find(params[:id])
end
endStack Overflow用户
发布于 2015-01-18 18:06:45
满足你的要求。为了建立微型仪器。做这样的事。
artist=Artist who is logged in
artist.artist_micro_posts.build(attributes)
artist.save在微博上发表评论
micro_posts= Micropost Id
micro_post.artist_micropost_comments.build(:artist_id=logged in person)
micro_post.save页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28011662
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