ams_endpoint.rb

ams_endpoint.rb

class FoosController < ApplicationController
  def index
    @collection = Foo.all
    render json: @collection, fields: params[:fields]
  end
end

class FooSerializer < ActiveModel::Serializer
  cache key: 'foo'
  
  attributes(
    :bar,
    :baz,
    :quz
  )
end

GET /foos?fields=bar # => { data: [{ type: 'foos', id: 1, attributes: { bar: 'bar' } }, { type: 'foos', id: 2, attributes: { bar: 'bar' } }] }
GET /foos            # => { data: [{ type: 'foos', id: 1, attributes: { bar: 'bar' } }, { type: 'foos', id: 2, attributes: { bar: 'bar' } }] }