PolymorphicIncludes

Allows you to specify per-class includes for polymorphic belongs_to associations.

Example

  class Group < ActiveRecord::Base
    has_many :group_groupables
    has_many :grouped_projects, :conditions => {:groupable_type => 'Project'}, :include => :groupable, :class_name => 'GroupGroupable'
  end

  class GroupGroupable < ActiveRecord::Base
    belongs_to :group
    belongs_to :groupable, :polymorphic => { :class_includes => {'Project' => {:shots => :tasks}} }
  end

  Group.first.grouped_projects

  ~   GroupGroupable Load (0.3ms)   SELECT * FROM "group_groupables" WHERE ("group_groupables".group_id = 10 AND ("group_groupables"."groupable_type" = E'Project'))
  ~   Project Load (0.6ms)   SELECT * FROM "projects" WHERE ("projects"."id" IN (3,4))
  ~   Shot Load (1.2ms)   SELECT "shots".* FROM "shots" WHERE ("shots".project_id IN (3,4))
  ~   Task Load (29.0ms)   SELECT "tasks".* FROM "tasks" WHERE ("tasks".shot_id IN (235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252...))

Copyright © 2008 Lachie Cox, released under the MIT license