123456789_123456789_123456789_123456789_123456789_

Class: Mongoid::Association::Referenced::HasAndBelongsToMany::Eager

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Mongoid::Association::Eager
Instance Chain:
self, ::Mongoid::Association::Eager
Inherits: Mongoid::Association::Eager
Defined in: lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb

Overview

Eager class for has_and_belongs_to_many associations.

Class Method Summary

::Mongoid::Association::Eager - Inherited

.new

Instantiate the eager load class.

Instance Method Summary

::Mongoid::Association::Eager - Inherited

#run

Run the preloader.
#each_loaded_document_of_class

Retrieves the documents of the specified class, that have the foreign key included in the specified list of keys.
#shift_association

Shift the current association metadata.

Constructor Details

This class inherits a constructor from Mongoid::Association::Eager

Instance Method Details

#group_by_key (private)

[ GitHub ] 

  


# File 'lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb', line 43



def group_by_key
  @association.foreign_key
end


  








  

    #key   (private)
  

  [ GitHub ]


  

  


# File 'lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb', line 47



def key
  @association.primary_key
end


  








  

    #keys_from_docs   (private)
  

  [ GitHub ]


  

  


# File 'lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb', line 31



def keys_from_docs
  keys = Set.new
  @docs.each do |d|
    keys += d.send(group_by_key)
  end
  keys.to_a
end


  








  

    #preload   (private)
  

  [ GitHub ]


  

  


# File 'lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb', line 14



def preload
  @docs.each do |d|
    set_relation(d, [])
  end

  entries = {}
  each_loaded_document do |doc|
    entries[doc.send(key)] = doc
  end

  @docs.each do |d|
    keys = d.send(group_by_key)
    docs = entries.values_at(*keys).compact
    set_relation(d, docs)
  end
end


  








  

    #set_relation(doc, element)   (private)
  

  [ GitHub ]


  

  


# File 'lib/mongoid/association/referenced/has_and_belongs_to_many/eager.rb', line 39



def set_relation(doc, element)
  doc.__build__(@association.name, element, @association) unless doc.blank?
end