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Examples

Given two models, a Post(title: string, body: text) and a Comment(name: string, body: text, post_id: integer), you will have two serializers:

class PostSerializer < ActiveModel::Serializer
  cache key: 'posts', expires_in: 3.hours
  attributes :title, :body

  has_many :comments
end

and

class CommentSerializer < ActiveModel::Serializer
  attributes :name, :body

  belongs_to :post
end

Generally speaking, you, as a user of ActiveModelSerializers, will write (or generate) these serializer classes.