Can anyone offer some advice as to what the "best" way to include nested objects/relations in a JSON response that you want to filter?
In the simple example below, say the model Comment has a soft delete flag is_deleted = true, I want to only include comments that have is_deleted = false. What's the best way to accomplish this?
posts = Post.all
render json: posts.to_json(:include => [:comments])
I could come up with a simple solution. In Post, you can scope the deleted comments out from the results, like this:
has_many :comments, -> { is_deleted: false }
This will return only those comments, which are not deleted. And then, your existing JSON code will work fine.
Edit 1:
This solution is as per our discussion in comments.
Create a convenience method in Post. This will return all the comments which are not deleted.
def visible_comments
comments.where(is_deleted: false)
end
Then, you can change your render method as follows:
render json: posts.to_json(:include => [:visible_comments])
This will call the visible_comments method of Post and will include the results returned by that method only.
scope :visible_comments, -> { comments.where(is_deleted: false) }, and include this scope in your JSON rendering.:include => [:visible_comments as :comments] ?Edit your modal
class Post < ActiveRecord::Base
def as_json(_options = {})
super only: [:id, :title],
include: {
comments: {
only: [:id, :comment_fieds]
}
end
end
class Comment < ActiveRecord::Base
default_scope { where is_deleted: false }
end
You can add comments and post field in only: [.....] that you want to include in response
posts = Post.all
render json: posts
