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Contents
# encoding: utf-8
module Mongoid #:nodoc:
module Associations #:nodoc:
# Represents a relational association to a "parent" object.
class ReferencedIn < Proxy
# Initializing a related association only requires looking up the object
# by its id.
#
# Options:
#
# document: The +Document+ that contains the relationship.
# options: The association +Options+.
def initialize(document, options, target = nil)
@options = options
if target
replace(target)
else
foreign_key = document.send(options.foreign_key)
replace(options.klass.find(foreign_key)) unless foreign_key.blank?
end
extends(options)
end
# Replaces the target with a new object
#
# Returns the association proxy
def replace(obj)
@target = obj
self
end
class << self
# Returns the macro used to create the association.
def macro
:referenced_in
end
# Perform an update of the relationship of the parent and child. This
# will assimilate the child +Document+ into the parent's object graph.
#
# Options:
#
# target: The target(parent) object
# document: The +Document+ to update.
# options: The association +Options+
#
# Example:
#
# <tt>ReferencedIn.update(person, game, options)</tt>
def update(target, document, options)
document.send("#{options.foreign_key}=", target ? target.id : nil)
new(document, options, target)
end
# Validate the options passed to the referenced in macro, to encapsulate
# the behavior in this class instead of the associations module.
#
# Options:
#
# options: Thank you captain obvious.
def validate_options(options = {})
check_dependent_not_allowed!(options)
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems