Include doesn't work on nested associations in serializer

[dnt294]

I've already posted this on Stackoverflow for more help, but I also post it here.

---

So I have models like this:

• folder, up_file has 1 chat_room
• chat_room belongs to crmable with polymorphic: true (so 1 chat_room may belongs to folder or 1 up_file)
• chat_room has many comments
• comment belongs to chat_room and user (who posted the comment)

I've defined all relationship like this:

class Folder < ApplicationRecord
    has_one :chat_room, as: :crmable, dependent: :destroy
end

class UpFile < ApplicationRecord
    has_one :chat_room, as: :crmable, dependent: :destroy
end

class ChatRoom < ApplicationRecord
    belongs_to :crmable, polymorphic: true

    has_many :comments, dependent: :destroy
    has_many :users, through: :comments
end

class Comment < ApplicationRecord
    belongs_to :chat_room
    belongs_to :user
end

I've follow their tutorial here but my associations not rendered.

class FolderSerializer < ActiveModel::Serializer
    
    attributes :id, :name, :ancestry, :creator_name #... my other attributes
    
    has_one :chat_room, include: [ :id, comments: :user ]
    # ^ I tried to serialize folder's chat_room with all it comments, along with these comments' users.
end

All I got is this - chat_room association not serialized?

[beauby]

Could you point me to where it says in the docs that this is supported? (serializer-level include directives)

[NullVoxPopuli]

per that PR's description:

Note: the serializer-level include option has been dropped for now (i.e. doing has_many :comments, include: 'author, posts' is still not possible).

[NullVoxPopuli]

it's highly recommended to use render option's includes.

render json: @resource, include: 'author,posts'