diff options
Diffstat (limited to 'activerecord/lib/active_record/core.rb')
| -rw-r--r-- | activerecord/lib/active_record/core.rb | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb index eb8f4ad669..f5349b0bea 100644 --- a/activerecord/lib/active_record/core.rb +++ b/activerecord/lib/active_record/core.rb @@ -1,5 +1,6 @@ require 'active_support/concern' require 'active_support/core_ext/hash/indifferent_access' +require 'active_support/core_ext/object/deep_dup' require 'thread' module ActiveRecord @@ -76,7 +77,7 @@ module ActiveRecord ## # :singleton-method: - # Specifies wether or not has_many or has_one association option + # Specifies whether or not has_many or has_one association option # :dependent => :restrict raises an exception. If set to true, the # ActiveRecord::DeleteRestrictionError exception will be raised # along with a DEPRECATION WARNING. If set to false, an error would @@ -165,7 +166,7 @@ module ActiveRecord # # Instantiates a single new object bypassing mass-assignment security # User.new({ :first_name => 'Jamie', :is_admin => true }, :without_protection => true) def initialize(attributes = nil, options = {}) - @attributes = self.class.initialize_attributes(self.class.column_defaults.dup) + @attributes = self.class.initialize_attributes(self.class.column_defaults.deep_dup) @columns_hash = self.class.column_types.dup init_internals @@ -203,13 +204,35 @@ module ActiveRecord self end - + + ## + # :method: clone + # Identical to Ruby's clone method. This is a "shallow" copy. Be warned that your attributes are not copied. + # That means that modifying attributes of the clone will modify the original, since they will both point to the + # same attributes hash. If you need a copy of your attributes hash, please use the #dup method. + # + # user = User.first + # new_user = user.clone + # user.name # => "Bob" + # new_user.name = "Joe" + # user.name # => "Joe" + # + # user.object_id == new_user.object_id # => false + # user.name.object_id == new_user.name.object_id # => true + # + # user.name.object_id == user.dup.name.object_id # => false + + ## + # :method: dup # Duped objects have no id assigned and are treated as new records. Note # that this is a "shallow" copy as it copies the object's attributes # only, not its associations. The extent of a "deep" copy is application # specific and is therefore left to the application to implement according # to its need. # The dup method does not preserve the timestamps (created|updated)_(at|on). + + ## + # :nodoc: def initialize_dup(other) cloned_attributes = other.clone_attributes(:read_attribute_before_type_cast) self.class.initialize_attributes(cloned_attributes) |