Eager load a certain number of levels of a nested resource

gistfile1.rb

def self.nested_include(nested_attribute, additional_attributes=[], nesting_level=6)
  attributes = additional_attributes
  nesting_level.times do
    attributes = additional_attributes + [{nested_attribute => attributes}]
  end
  includes(attributes)
end

scope :with_nesting, nested_include(:children_ordered, [:user, :project])

# Equivalent to
scope :with_nesting, includes(:user, :project, children_ordered: [:user, :project, children_ordered: [:user, :project, children_ordered: [:user, :project, children_ordered: [:user, :project, children_ordered: :children_ordered]]]])