ben-fly2success/includes_iidx

includes_iidx

A simple gem helping you building includes scopes to load dependent associations, thus keeping constant-complexity queries.

Usage example

Just indicate dependencies as following:

def Parent
  def full_name
    parent_column_attribute
  end
  set_dependencies_for :full_name, :parent_column_attribute
end

def Child
  belongs_to :parent

  def full_name
    "#{parent.full_name}: #{child_column_attribute}"
  end
  set_dependencies_for :full_name, [:model_attribute, parent: :full_name]
end

Then when it comes to display a collection of Child, normally you would do :

Child.all.map(&:full_name) # Results in an N + 1 query

To prevent the N + 1 query, use the following scope :

Child.all.includes_iidx(:full_name).map(&:full_name) # Constant query. Yay !

For each requested attribute passed to includes_iidx, all dependent models will be included.

Gem compatibility

Globalize is automatically supported. You can put a translated attribute in a set of dependancies, when requested the translations association will be loaded.