diff options
Diffstat (limited to 'activerecord/lib/active_record/nested_attributes.rb')
| -rw-r--r-- | activerecord/lib/active_record/nested_attributes.rb | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb index 386f0e7ca7..5143e804d1 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 to specify that the an existing record can only be updated. + # A new record in only created when there is no existing record. This + # option only works for on-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) @@ -288,6 +293,13 @@ module ActiveRecord # record’s id, then the existing record will be modified. Otherwise a new # record will be built. # + # If update_only is true, a new record is only created when no object exists, + # otherwise it will be updated + # + # 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. 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. @@ -295,7 +307,15 @@ module ActiveRecord options = self.nested_attributes_options[association_name] attributes = attributes.with_indifferent_access - if attributes['id'].blank? + if options[:update_only] + if existing_record = send(association_name) + assign_to_or_mark_for_destruction(existing_record, attributes, options[:allow_destroy]) + else + unless reject_new_record?(association_name, attributes) + send("build_#{association_name}", attributes.except(*UNASSIGNABLE_KEYS)) + end + end + elsif attributes['id'].blank? unless reject_new_record?(association_name, attributes) method = "build_#{association_name}" if respond_to?(method) |