The second level of serializers should still put their associations on the root

[wycats]

class PostSerializer < ApplicationSerializer
  embed :ids, :include => true
  has_many :comments
end

class CommentSerializer < ApplicationSerializer
  embed :ids, :include => true
  has_many :tags
end

The tags should be at the top root, not alongside comments.

[wycats]

One implementation would be to pass { root: root } as options into the serializer, and serializable_hash would insert the associations at the root, instead of making as_json responsible for inserting the associations alongside.

[ahawkins]

{
  :post = {
    :title => 'Title 1',
    :content => 'Blah'
    comments: [1,3,4]
  },
  :comments => [
    { :title => 'Progamming', :tags => [1,2]},
    { :title => 'Programming Ruby', :tags => [1]}
  ],
  :tags => ['programming', 'ruby']
}

Is that what you're talking about?

[wycats]

Done and done.

@Adman65 no... the :tags would be an Array of Hashes containing IDs.