Module: DataMapper::NestedAttributes::Resource

Defined in:
lib/dm-accepts_nested_attributes/resource.rb

Overview

Extensions and customizations for @see DataMapper::Resource that are needed if the @see DataMapper::Resource wants to accept nested attributes for any given relationship. Basically, this module provides functionality that allows either assignment or marking for destruction of related parent and child associations, based on the given attributes and what kind of relationship should be altered.

Instance Method Summary collapse

Instance Method Details

#sanitize_nested_attributes(attributes) ⇒ Hash

Can be used to remove ambiguities from the passed attributes. Consider a situation with a belongs_to association where both a valid value for the foreign_key attribute and nested_attributes for a new record are present (i.e. item_type_id and item_type_attributes are present). Also see http://is.gd/sz2d on the rails-core ml for a discussion on this. The basic idea is, that there should be a well defined behavior for what exactly happens when such a situation occurs. I'm currently in favor for using the foreign_key if it is present, but this probably needs more thinking. For now, this method basically is a no-op, but at least it provides a hook where everyone can perform it's own sanitization by overwriting this method.



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# File 'lib/dm-accepts_nested_attributes/resource.rb', line 32

def sanitize_nested_attributes(attributes)
  attributes # noop
end

#save ⇒ Object

Destroy intermediate resources that possibly need to be cleaned up



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# File 'lib/dm-accepts_nested_attributes/resource.rb', line 38

def save(*)
  saved = super
  remove_destroyables
  saved
end