Testcode for embedded pagination

gistfile1.rb

class EmbeddedSomething
  include Mongoid::Document
  include Mongoid::Timestamps

  field :name, type: String

  embedded_in :something
end

class Something
  include Mongoid::Document
  include Mongoid::Timestamps

  field :name, type: String

  embeds_many :embedded_somethings

  def self.create_objects
    10.times do |n|
      something = Something.create(name: "test object #{n}")
      10.times do |x|
        EmbeddedSomething.create(something: something, name: "embedded #{n}-#{x}")
      end
    end
  end
  
  def self.test
    # setup
    Something.destroy_all
    Something.create_objects
    
    # pagination working fine with relation
    Something.pagination_test(1)
    Something.pagination_test(2)
    Something.pagination_test(3)
    
    # pagination of embedded objects working fine 
    Something.embedded_pagination_test(1)
    Something.embedded_pagination_test(2)
    
    # pagination of embedded objects breaks if page is empty:
    Something.embedded_pagination_test(3)
    
    # cleanup
    Something.destroy_all
  end

  def self.pagination_test(page = 1)

    limit = 6
    offset = (page - 1) * limit

    puts "test pagination with page #{page} and limit #{limit}"

    scope = Something.limit(limit).offset(offset).map(&:name)

    puts scope.to_a.inspect
  end

  def self.embedded_pagination_test(page = 1)

    limit = 6
    offset = (page - 1) * limit

    puts "test embedded pagination with page #{page} and limit #{limit}"

    something = Something.first

    scope = something.embedded_somethings.limit(limit).offset(offset).map(&:name)

    puts scope.to_a.inspect
  end

end