Class: Mongoid::Relations::Eager::HasAndBelongsToMany

Inherits:
Base
  • Object
show all
Defined in:
lib/mongoid/relations/eager/has_and_belongs_to_many.rb

Instance Method Summary collapse

Methods inherited from Base

#each_loaded_document, #grouped_docs, #initialize, #run, #set_on_parent, #shift_metadata

Constructor Details

This class inherits a constructor from Mongoid::Relations::Eager::Base

Instance Method Details

#group_by_key ⇒ Object 



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# File 'lib/mongoid/relations/eager/has_and_belongs_to_many.rb', line 37

def group_by_key
  @metadata.foreign_key
end

#key ⇒ Object 



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# File 'lib/mongoid/relations/eager/has_and_belongs_to_many.rb', line 41

def key
  @metadata.primary_key
end

#keys_from_docs ⇒ Object 



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# File 'lib/mongoid/relations/eager/has_and_belongs_to_many.rb', line 25

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

#preload ⇒ Object 



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# File 'lib/mongoid/relations/eager/has_and_belongs_to_many.rb', line 8

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)
    set_relation(d, docs)
  end
end

#set_relation(doc, element) ⇒ Object 



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# File 'lib/mongoid/relations/eager/has_and_belongs_to_many.rb', line 33

def set_relation(doc, element)
  doc.__build__(@metadata.name, element, @metadata)
end