diff options
Diffstat (limited to 'activesupport/lib/active_support/callbacks.rb')
| -rw-r--r-- | activesupport/lib/active_support/callbacks.rb | 58 |
1 files changed, 26 insertions, 32 deletions
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb index 5c738572a8..cd467e13f6 100644 --- a/activesupport/lib/active_support/callbacks.rb +++ b/activesupport/lib/active_support/callbacks.rb @@ -7,14 +7,14 @@ require 'active_support/core_ext/kernel/singleton_class' require 'thread' module ActiveSupport - # Callbacks are code hooks that are run at key points in an object's lifecycle. + # Callbacks are code hooks that are run at key points in an object's life cycle. # The typical use case is to have a base class define a set of callbacks # relevant to the other functionality it supplies, so that subclasses can # install callbacks that enhance or modify the base functionality without # needing to override or redefine methods of the base class. # # Mixing in this module allows you to define the events in the object's - # lifecycle that will support callbacks (via +ClassMethods.define_callbacks+), + # life cycle that will support callbacks (via +ClassMethods.define_callbacks+), # set the instance methods, procs, or callback objects to be called (via # +ClassMethods.set_callback+), and run the installed callbacks at the # appropriate times (via +run_callbacks+). @@ -71,7 +71,8 @@ module ActiveSupport # order. # # If the callback chain was halted, returns +false+. Otherwise returns the - # result of the block, or +true+ if no block is given. + # result of the block, +nil+ if no callbacks have been set, or +true+ + # if callbacks have been set but no block is given. # # run_callbacks :save do # save @@ -89,7 +90,7 @@ module ActiveSupport private - # A hook invoked everytime a before callback is halted. + # A hook invoked every time a before callback is halted. # This can be overridden in AS::Callback implementors in order # to provide better debugging/logging. def halted_callback_hook(filter) @@ -131,8 +132,6 @@ module ActiveSupport end end - private - def self.halting_and_conditional(next_callback, user_callback, user_conditions, halted_lambda, filter) lambda { |env| target = env.target @@ -149,6 +148,7 @@ module ActiveSupport next_callback.call env } end + private_class_method :halting_and_conditional def self.halting(next_callback, user_callback, halted_lambda, filter) lambda { |env| @@ -166,6 +166,7 @@ module ActiveSupport next_callback.call env } end + private_class_method :halting def self.conditional(next_callback, user_callback, user_conditions) lambda { |env| @@ -178,6 +179,7 @@ module ActiveSupport next_callback.call env } end + private_class_method :conditional def self.simple(next_callback, user_callback) lambda { |env| @@ -185,6 +187,7 @@ module ActiveSupport next_callback.call env } end + private_class_method :simple end class After @@ -208,8 +211,6 @@ module ActiveSupport end end - private - def self.halting_and_conditional(next_callback, user_callback, user_conditions) lambda { |env| env = next_callback.call env @@ -223,6 +224,7 @@ module ActiveSupport env } end + private_class_method :halting_and_conditional def self.halting(next_callback, user_callback) lambda { |env| @@ -233,6 +235,7 @@ module ActiveSupport env } end + private_class_method :halting def self.conditional(next_callback, user_callback, user_conditions) lambda { |env| @@ -246,6 +249,7 @@ module ActiveSupport env } end + private_class_method :conditional def self.simple(next_callback, user_callback) lambda { |env| @@ -254,6 +258,7 @@ module ActiveSupport env } end + private_class_method :simple end class Around @@ -269,8 +274,6 @@ module ActiveSupport end end - private - def self.halting_and_conditional(next_callback, user_callback, user_conditions) lambda { |env| target = env.target @@ -288,23 +291,25 @@ module ActiveSupport end } end + private_class_method :halting_and_conditional def self.halting(next_callback, user_callback) lambda { |env| target = env.target value = env.value - unless env.halted + if env.halted + next_callback.call env + else user_callback.call(target, value) { env = next_callback.call env env.value } env - else - next_callback.call env end } end + private_class_method :halting def self.conditional(next_callback, user_callback, user_conditions) lambda { |env| @@ -322,6 +327,7 @@ module ActiveSupport end } end + private_class_method :conditional def self.simple(next_callback, user_callback) lambda { |env| @@ -332,6 +338,7 @@ module ActiveSupport env } end + private_class_method :simple end end @@ -409,15 +416,8 @@ module ActiveSupport # Procs:: A proc to call with the object. # Objects:: An object with a <tt>before_foo</tt> method on it to call. # - # All of these objects are compiled into methods and handled - # the same after this point: - # - # Symbols:: Already methods. - # Strings:: class_eval'd into methods. - # Procs:: using define_method compiled into methods. - # Objects:: - # a method is created that calls the before_foo method - # on the object. + # All of these objects are converted into a lambda and handled + # the same after this point. def make_lambda(filter) case filter when Symbol @@ -566,7 +566,7 @@ module ActiveSupport # # set_callback :save, :before, :before_meth # set_callback :save, :after, :after_meth, if: :condition - # set_callback :save, :around, ->(r, &block) { stuff; result = block.call; stuff } + # set_callback :save, :around, ->(r, block) { stuff; result = block.call; stuff } # # The second arguments indicates whether the callback is to be run +:before+, # +:after+, or +:around+ the event. If omitted, +:before+ is assumed. This @@ -574,10 +574,10 @@ module ActiveSupport # # set_callback :save, :before_meth # - # The callback can specified as a symbol naming an instance method; as a + # The callback can be specified as a symbol naming an instance method; as a # proc, lambda, or block; as a string to be instance evaluated; or as an # object that responds to a certain method determined by the <tt>:scope</tt> - # argument to +define_callback+. + # argument to +define_callbacks+. # # If a proc, lambda, or block is given, its body is evaluated in the context # of the current object. It can also optionally accept the current object as @@ -648,7 +648,7 @@ module ActiveSupport self.set_callbacks name, callbacks.dup.clear end - # Define sets of events in the object lifecycle that support callbacks. + # Define sets of events in the object life cycle that support callbacks. # # define_callbacks :validate # define_callbacks :initialize, :save, :destroy @@ -718,12 +718,6 @@ module ActiveSupport # would call <tt>Audit#save</tt>. def define_callbacks(*names) options = names.extract_options! - if options.key?(:terminator) && String === options[:terminator] - ActiveSupport::Deprecation.warn "String based terminators are deprecated, please use a lambda" - value = options[:terminator] - line = class_eval "lambda { |result| #{value} }", __FILE__, __LINE__ - options[:terminator] = lambda { |target, result| target.instance_exec(result, &line) } - end names.each do |name| class_attribute "_#{name}_callbacks" |