[英]complex associations with active model serializer
For the sake of simplicity I've written this question as if writing a blog application but in actual fact it's an entirely different application. 为了简单起见,我已经像编写博客应用程序一样写了这个问题,但实际上它是一个完全不同的应用程序。 I have a show action similar to this in my users_controller.rb.
我的users_controller.rb中有一个与此类似的表演动作。
def show
@user = User.find(params[:id])
@posts = @user.posts
respond_to do |format|
format.html
format.json { render json: @user }
end
end
Each post
also has many comments
. 每个
post
也有很多comments
。 If I wanted to show all of the user posts and comments on those posts ( regardless of which user made the comment ), in the views/user/show.html.erb
, it's fairly easy to access those comments from the obvious association between posts and comments. 如果我想显示所有用户帖子和这些帖子的评论( 无论是哪个用户发表评论 ),则在
views/user/show.html.erb
,可以很容易地从帖子之间的明显关联中访问这些评论。和评论。
<% for post in @posts %>
<% post.comments.each do |c| %>
...
That will give me all the comments on those posts, not just the comments the user made, which is what I want. 这将为我提供这些帖子的所有评论,而不仅仅是用户发表的评论,这就是我想要的。
Now, I'm using active model serializer in this application, and in the User serializer, I can declare the association with posts has_many :posts
, and then if I go to localhost:3000/user/1.json, I see the user details and the posts. 现在,我在此应用程序中使用活动模型序列化程序,并且在用户序列化程序中,我可以声明与posts
has_many :posts
的关联,然后如果我转到localhost:3000 / user / 1.json,我会看到用户详细信息和帖子。 However, I can't declare has_many :comments
unless I only want the comments that that user made. 但是,除非我只想要该用户发表的评论,否则我不能声明
has_many :comments
。 However, I want all the comments on those posts regardless of the user who made them. 但是,无论发布者是谁,我都希望对这些帖子发表所有评论。
How could I achieve this with active model serializer? 如何使用主动模型序列化器实现此目标?
You could create a new serializer for Posts that includes all comments: 您可以为包含所有评论的帖子创建一个新的序列化器:
class FullPostSerializer < ActiveModel::Serializer
has_many :comments
def comments
object.comments
end
end
Then use the FullPostSerializer in your User serializer: 然后在您的用户序列化程序中使用FullPostSerializer:
has_many :post, serializer: FullPostSerializer
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