Module: Mongoid::Relations::Eager

Included in:
Contextual::Memory, Contextual::Mongo
Defined in:
lib/mongoid/relations/eager.rb,
lib/mongoid/relations/eager/base.rb,
lib/mongoid/relations/eager/has_one.rb,
lib/mongoid/relations/eager/has_many.rb,
lib/mongoid/relations/eager/belongs_to.rb,
lib/mongoid/relations/eager/has_and_belongs_to_many.rb

Defined Under Namespace

Classes: Base, BelongsTo, HasAndBelongsToMany, HasMany, HasOne

Instance Method Summary collapse

Instance Method Details

#eager_load(docs) ⇒ Object 



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# File 'lib/mongoid/relations/eager.rb', line 16

def eager_load(docs)
  docs.tap do |d|
    if eager_loadable?
      preload(criteria.inclusions, d)
    end
  end
end

#eager_loadable? ⇒ Boolean

Returns:



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# File 'lib/mongoid/relations/eager.rb', line 12

def eager_loadable?
  !criteria.inclusions.empty?
end

#preload(relations, docs) ⇒ Object 



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# File 'lib/mongoid/relations/eager.rb', line 24

def preload(relations, docs)
  grouped_relations = relations.group_by do |metadata|
    metadata.inverse_class_name
  end
  grouped_relations.keys.each do |_klass|
    grouped_relations[_klass] = grouped_relations[_klass].group_by do |metadata|
      metadata.relation
    end
  end
  grouped_relations.each do |_klass, associations|
    docs = associations.collect do |_relation, association|
      _relation.eager_load_klass.new(association, docs).run
    end.flatten
  end
end