diff options
Diffstat (limited to 'activerecord/lib/active_record/nested_attributes.rb')
| -rw-r--r-- | activerecord/lib/active_record/nested_attributes.rb | 48 |
1 files changed, 26 insertions, 22 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb index ca3110a374..ff3a51d5c0 100644 --- a/activerecord/lib/active_record/nested_attributes.rb +++ b/activerecord/lib/active_record/nested_attributes.rb @@ -212,6 +212,11 @@ module ActiveRecord # nested attributes array exceeds the specified limit, NestedAttributes::TooManyRecords # exception is raised. If omitted, any number associations can be processed. # Note that the :limit option is only applicable to one-to-many associations. + # [:update_only] + # Allows you to specify that an existing record may only be updated. + # A new record may only be created when there is no existing record. + # This option only works for one-to-one associations and is ignored for + # collection associations. This option is off by default. # # Examples: # # creates avatar_attributes= @@ -221,9 +226,9 @@ module ActiveRecord # # creates avatar_attributes= and posts_attributes= # accepts_nested_attributes_for :avatar, :posts, :allow_destroy => true def accepts_nested_attributes_for(*attr_names) - options = { :allow_destroy => false } + options = { :allow_destroy => false, :update_only => false } options.update(attr_names.extract_options!) - options.assert_valid_keys(:allow_destroy, :reject_if, :limit) + options.assert_valid_keys(:allow_destroy, :reject_if, :limit, :update_only) attr_names.each do |association_name| if reflection = reflect_on_association(association_name) @@ -235,7 +240,7 @@ module ActiveRecord end reflection.options[:autosave] = true - + add_autosave_association_callbacks(reflection) self.nested_attributes_options[association_name.to_sym] = options if options[:reject_if] == :all_blank @@ -243,15 +248,13 @@ module ActiveRecord end # def pirate_attributes=(attributes) - # assign_nested_attributes_for_one_to_one_association(:pirate, attributes, false) + # assign_nested_attributes_for_one_to_one_association(:pirate, attributes) # end class_eval %{ def #{association_name}_attributes=(attributes) assign_nested_attributes_for_#{type}_association(:#{association_name}, attributes) end }, __FILE__, __LINE__ - - add_autosave_association_callbacks(reflection) else raise ArgumentError, "No association found for name `#{association_name}'. Has it been defined yet?" end @@ -286,28 +289,29 @@ module ActiveRecord # Assigns the given attributes to the association. # - # If the given attributes include an <tt>:id</tt> that matches the existing - # record’s id, then the existing record will be modified. Otherwise a new - # record will be built. + # If update_only is false and the given attributes include an <tt>:id</tt> + # that matches the existing record’s id, then the existing record will be + # modified. If update_only is true, a new record is only created when no + # object exists. Otherwise a new record will be built. # - # If the given attributes include a matching <tt>:id</tt> attribute _and_ a - # <tt>:_destroy</tt> key set to a truthy value, then the existing record - # will be marked for destruction. + # If the given attributes include a matching <tt>:id</tt> attribute, or + # update_only is true, and a <tt>:_destroy</tt> key set to a truthy value, + # then the existing record will be marked for destruction. def assign_nested_attributes_for_one_to_one_association(association_name, attributes) options = self.nested_attributes_options[association_name] attributes = attributes.with_indifferent_access + check_existing_record = (options[:update_only] || !attributes['id'].blank?) - if attributes['id'].blank? - unless reject_new_record?(association_name, attributes) - method = "build_#{association_name}" - if respond_to?(method) - send(method, attributes.except(*UNASSIGNABLE_KEYS)) - else - raise ArgumentError, "Cannot build association #{association_name}. Are you trying to build a polymorphic one-to-one association?" - end + if check_existing_record && (record = send(association_name)) && + (options[:update_only] || record.id.to_s == attributes['id'].to_s) + assign_to_or_mark_for_destruction(record, attributes, options[:allow_destroy]) + elsif !reject_new_record?(association_name, attributes) + method = "build_#{association_name}" + if respond_to?(method) + send(method, attributes.except(*UNASSIGNABLE_KEYS)) + else + raise ArgumentError, "Cannot build association #{association_name}. Are you trying to build a polymorphic one-to-one association?" end - elsif (existing_record = send(association_name)) && existing_record.id.to_s == attributes['id'].to_s - assign_to_or_mark_for_destruction(existing_record, attributes, options[:allow_destroy]) end end |