Class: Mongoid::Associations::EmbedsOne

Inherits:
Proxy show all
Defined in:
lib/mongoid/associations/embeds_one.rb

Overview

Represents an association that is embedded in a parent document as a one-to-one relationship.

Instance Attribute Summary

Attributes inherited from Proxy

#options, #target

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Proxy

#extends, #method_missing

Constructor Details

#initialize(document, attrs, options) ⇒ EmbedsOne

Creates the new association by finding the attributes in the parent document with its name, and instantiating a new document for it.

All method calls on this object will then be delegated to the internal document itself.

Options:

document: The parent Document attributes: The attributes of the target object. options: The association options.

Returns:

A new HashOne association proxy.



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# File 'lib/mongoid/associations/embeds_one.rb', line 29

def initialize(document, attrs, options)
  @parent, @options  = document, options
  @target = attrs.assimilate(@parent, @options, attrs.klass)
  extends(options)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Mongoid::Associations::Proxy

Class Method Details

.instantiate(document, options) ⇒ Object

Preferred method of instantiating a new EmbedsOne, since nil values will be handled properly.

Options:

document: The parent Document options: The association options.

Returns:

A new EmbedsOne association proxy.



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# File 'lib/mongoid/associations/embeds_one.rb', line 61

def instantiate(document, options)
  attributes = document.raw_attributes[options.name]
  return nil if attributes.blank?
  new(document, attributes, options)
end

.macro ⇒ Object

Returns the macro used to create the association.



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# File 'lib/mongoid/associations/embeds_one.rb', line 68

def macro
  :embeds_one
end

.update(child, parent, options) ⇒ Object

Perform an update of the relationship of the parent and child. This will assimilate the child Document into the parent’s object graph.

Options:

child: The child Document or Hash. parent: The parent Document to update. options: The association Options

Example:

EmbedsOne.update({:first_name => "Hank"}, person, options)

Returns:

A new EmbedsOne association proxy.



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# File 'lib/mongoid/associations/embeds_one.rb', line 88

def update(child, parent, options)
  child.assimilate(parent, options)
  instantiate(parent, options)
end

Instance Method Details

#build(attrs = {}, type = nil) ⇒ Object

Build a new object for the association.



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# File 'lib/mongoid/associations/embeds_one.rb', line 9

def build(attrs = {}, type = nil)
  @target = attrs.assimilate(@parent, @options, type); self
end

#nested_build(attributes) ⇒ Object

Used for setting the association via a nested attributes setter on the parent Document. Called when using accepts_nested_attributes_for.

Options:

attributes: The attributes for the new association

Returns:

A new target document.



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# File 'lib/mongoid/associations/embeds_one.rb', line 45

def nested_build(attributes)
  build(attributes)
end