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-rw-r--r--activerecord/lib/active_record/nested_attributes.rb48
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