diff options
Diffstat (limited to 'activerecord/lib/active_record/nested_attributes.rb')
| -rw-r--r-- | activerecord/lib/active_record/nested_attributes.rb | 138 |
1 files changed, 95 insertions, 43 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb index c5bd11edbf..f0c29bbf73 100644 --- a/activerecord/lib/active_record/nested_attributes.rb +++ b/activerecord/lib/active_record/nested_attributes.rb @@ -90,8 +90,9 @@ module ActiveRecord # accepts_nested_attributes_for :posts # end # - # You can now set or update attributes on an associated post model through - # the attribute hash. + # You can now set or update attributes on the associated posts through + # an attribute hash for a member: include the key +:posts_attributes+ + # with an array of hashes of post attributes as a value. # # For each hash that does _not_ have an <tt>id</tt> key a new record will # be instantiated, unless the hash also contains a <tt>_destroy</tt> key @@ -114,10 +115,10 @@ module ActiveRecord # hashes if they fail to pass your criteria. For example, the previous # example could be rewritten as: # - # class Member < ActiveRecord::Base - # has_many :posts - # accepts_nested_attributes_for :posts, reject_if: proc { |attributes| attributes['title'].blank? } - # end + # class Member < ActiveRecord::Base + # has_many :posts + # accepts_nested_attributes_for :posts, reject_if: proc { |attributes| attributes['title'].blank? } + # end # # params = { member: { # name: 'joe', posts_attributes: [ @@ -134,19 +135,19 @@ module ActiveRecord # # Alternatively, :reject_if also accepts a symbol for using methods: # - # class Member < ActiveRecord::Base - # has_many :posts - # accepts_nested_attributes_for :posts, reject_if: :new_record? - # end + # class Member < ActiveRecord::Base + # has_many :posts + # accepts_nested_attributes_for :posts, reject_if: :new_record? + # end # - # class Member < ActiveRecord::Base - # has_many :posts - # accepts_nested_attributes_for :posts, reject_if: :reject_posts + # class Member < ActiveRecord::Base + # has_many :posts + # accepts_nested_attributes_for :posts, reject_if: :reject_posts # - # def reject_posts(attributed) - # attributed['title'].blank? - # end - # end + # def reject_posts(attributed) + # attributed['title'].blank? + # end + # end # # If the hash contains an <tt>id</tt> key that matches an already # associated record, the matching record will be modified: @@ -183,6 +184,29 @@ module ActiveRecord # member.save # member.reload.posts.length # => 1 # + # Nested attributes for an associated collection can also be passed in + # the form of a hash of hashes instead of an array of hashes: + # + # Member.create(name: 'joe', + # posts_attributes: { first: { title: 'Foo' }, + # second: { title: 'Bar' } }) + # + # has the same effect as + # + # Member.create(name: 'joe', + # posts_attributes: [ { title: 'Foo' }, + # { title: 'Bar' } ]) + # + # The keys of the hash which is the value for +:posts_attributes+ are + # ignored in this case. + # However, it is not allowed to use +'id'+ or +:id+ for one of + # such keys, otherwise the hash will be wrapped in an array and + # interpreted as an attribute hash for a single post. + # + # Passing attributes for an associated collection in the form of a hash + # of hashes can be used with hashes generated from HTTP/HTML parameters, + # where there maybe no natural way to submit an array of hashes. + # # === Saving # # All changes to models, including the destruction of those marked for @@ -269,23 +293,36 @@ module ActiveRecord self.nested_attributes_options = nested_attributes_options type = (reflection.collection? ? :collection : :one_to_one) - - # def pirate_attributes=(attributes) - # assign_nested_attributes_for_one_to_one_association(:pirate, attributes, mass_assignment_options) - # end - generated_feature_methods.module_eval <<-eoruby, __FILE__, __LINE__ + 1 - if method_defined?(:#{association_name}_attributes=) - remove_method(:#{association_name}_attributes=) - end - def #{association_name}_attributes=(attributes) - assign_nested_attributes_for_#{type}_association(:#{association_name}, attributes) - end - eoruby + generate_association_writer(association_name, type) else raise ArgumentError, "No association found for name `#{association_name}'. Has it been defined yet?" end end end + + private + + # Generates a writer method for this association. Serves as a point for + # accessing the objects in the association. For example, this method + # could generate the following: + # + # def pirate_attributes=(attributes) + # assign_nested_attributes_for_one_to_one_association(:pirate, attributes) + # end + # + # This redirects the attempts to write objects in an association through + # the helper methods defined below. Makes it seem like the nested + # associations are just regular associations. + def generate_association_writer(association_name, type) + generated_feature_methods.module_eval <<-eoruby, __FILE__, __LINE__ + 1 + if method_defined?(:#{association_name}_attributes=) + remove_method(:#{association_name}_attributes=) + end + def #{association_name}_attributes=(attributes) + assign_nested_attributes_for_#{type}_association(:#{association_name}, attributes) + end + eoruby + end end # Returns ActiveRecord::AutosaveAssociation::marked_for_destruction? It's @@ -371,20 +408,7 @@ module ActiveRecord raise ArgumentError, "Hash or Array expected, got #{attributes_collection.class.name} (#{attributes_collection.inspect})" end - if limit = options[:limit] - limit = case limit - when Symbol - send(limit) - when Proc - limit.call - else - limit - end - - if limit && attributes_collection.size > limit - raise TooManyRecords, "Maximum #{limit} records are allowed. Got #{attributes_collection.size} records instead." - end - end + check_record_limit!(options[:limit], attributes_collection) if attributes_collection.is_a? Hash keys = attributes_collection.keys @@ -433,6 +457,29 @@ module ActiveRecord end end + # Takes in a limit and checks if the attributes_collection has too many + # records. The method will take limits in the form of symbols, procs, and + # number-like objects (anything that can be compared with an integer). + # + # Will raise an TooManyRecords error if the attributes_collection is + # larger than the limit. + def check_record_limit!(limit, attributes_collection) + if limit + limit = case limit + when Symbol + send(limit) + when Proc + limit.call + else + limit + end + + if limit && attributes_collection.size > limit + raise TooManyRecords, "Maximum #{limit} records are allowed. Got #{attributes_collection.size} records instead." + end + end + end + # Updates a record with the +attributes+ or marks it for destruction if # +allow_destroy+ is +true+ and has_destroy_flag? returns +true+. def assign_to_or_mark_for_destruction(record, attributes, allow_destroy) @@ -452,6 +499,11 @@ module ActiveRecord has_destroy_flag?(attributes) || call_reject_if(association_name, attributes) end + # Determines if a record with the particular +attributes+ should be + # rejected by calling the reject_if Symbol or Proc (if defined). + # The reject_if option is defined by +accepts_nested_attributes_for+. + # + # Returns false if there is a +destroy_flag+ on the attributes. def call_reject_if(association_name, attributes) return false if has_destroy_flag?(attributes) case callback = self.nested_attributes_options[association_name][:reject_if] |