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module AbstractController
module Callbacks
extend ActiveSupport::Concern
# Uses ActiveSupport::Callbacks as the base functionality. For
# more details on the whole callback system, read the documentation
# for ActiveSupport::Callbacks.
include ActiveSupport::Callbacks
included do
define_callbacks :process_action, :terminator => "response_body", :skip_after_callbacks_if_terminated => true
end
# Override AbstractController::Base's process_action to run the
# process_action callbacks around the normal behavior.
def process_action(*args)
run_callbacks(:process_action) do
super
end
end
module ClassMethods
# If :only or :except are used, convert the options into the
# :unless and :if options of ActiveSupport::Callbacks.
# The basic idea is that :only => :index gets converted to
# :if => proc {|c| c.action_name == "index" }.
#
# ==== Options
# * <tt>only</tt> - The callback should be run only for this action
# * <tt>except</tt> - The callback should be run for all actions except this action
def _normalize_callback_options(options)
_normalize_callback_option(options, :only, :if)
_normalize_callback_option(options, :except, :unless)
end
def _normalize_callback_option(options, from, to) # :nodoc:
if from = options[from]
from = Array(from).map {|o| "action_name == '#{o}'"}.join(" || ")
options[to] = Array(options[to]) << from
end
end
# Skip before, after, and around action callbacks matching any of the names
# Aliased as skip_filter.
#
# ==== Parameters
# * <tt>names</tt> - A list of valid names that could be used for
# callbacks. Note that skipping uses Ruby equality, so it's
# impossible to skip a callback defined using an anonymous proc
# using #skip_filter
def skip_action_callback(*names)
skip_before_action(*names)
skip_after_action(*names)
skip_around_action(*names)
end
alias_method :skip_filter, :skip_action_callback
# Take callback names and an optional callback proc, normalize them,
# then call the block with each callback. This allows us to abstract
# the normalization across several methods that use it.
#
# ==== Parameters
# * <tt>callbacks</tt> - An array of callbacks, with an optional
# options hash as the last parameter.
# * <tt>block</tt> - A proc that should be added to the callbacks.
#
# ==== Block Parameters
# * <tt>name</tt> - The callback to be added
# * <tt>options</tt> - A hash of options to be used when adding the callback
def _insert_callbacks(callbacks, block = nil)
options = callbacks.last.is_a?(Hash) ? callbacks.pop : {}
_normalize_callback_options(options)
callbacks.push(block) if block
callbacks.each do |callback|
yield callback, options
end
end
##
# :method: before_action
#
# :call-seq: before_action(names, block)
#
# Append a callback before actions. See _insert_callbacks for parameter details.
# Aliased as before_filter.
##
# :method: prepend_before_action
#
# :call-seq: prepend_before_action(names, block)
#
# Prepend a callback before actions. See _insert_callbacks for parameter details.
# Aliased as prepend_before_filter.
##
# :method: skip_before_action
#
# :call-seq: skip_before_action(names)
#
# Skip a callback before actions. See _insert_callbacks for parameter details.
# Aliased as skip_before_filter.
##
# :method: append_before_action
#
# :call-seq: append_before_action(names, block)
#
# Append a callback before actions. See _insert_callbacks for parameter details.
# Aliased as append_before_filter.
##
# :method: after_action
#
# :call-seq: after_action(names, block)
#
# Append a callback after actions. See _insert_callbacks for parameter details.
# Aliased as after_filter.
##
# :method: prepend_after_action
#
# :call-seq: prepend_after_action(names, block)
#
# Prepend a callback after actions. See _insert_callbacks for parameter details.
# Aliased as prepend_after_filter.
##
# :method: skip_after_action
#
# :call-seq: skip_after_action(names)
#
# Skip a callback after actions. See _insert_callbacks for parameter details.
# Aliased as skip_after_filter.
##
# :method: append_after_action
#
# :call-seq: append_after_action(names, block)
#
# Append a callback after actions. See _insert_callbacks for parameter details.
# Aliased as append_after_filter.
##
# :method: around_action
#
# :call-seq: around_action(names, block)
#
# Append a callback around actions. See _insert_callbacks for parameter details.
# Aliased as around_filter.
##
# :method: prepend_around_action
#
# :call-seq: prepend_around_action(names, block)
#
# Prepend a callback around actions. See _insert_callbacks for parameter details.
# Aliased as prepend_around_filter.
##
# :method: skip_around_action
#
# :call-seq: skip_around_action(names)
#
# Skip a callback around actions. See _insert_callbacks for parameter details.
# Aliased as skip_around_filter.
##
# :method: append_around_action
#
# :call-seq: append_around_action(names, block)
#
# Append a callback around actions. See _insert_callbacks for parameter details.
# Aliased as append_around_filter.
# set up before_action, prepend_before_action, skip_before_action, etc.
# for each of before, after, and around.
[:before, :after, :around].each do |callback|
class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
# Append a before, after or around callback. See _insert_callbacks
# for details on the allowed parameters.
def #{callback}_action(*names, &blk) # def before_action(*names, &blk)
_insert_callbacks(names, blk) do |name, options| # _insert_callbacks(names, blk) do |name, options|
set_callback(:process_action, :#{callback}, name, options) # set_callback(:process_action, :before, name, options)
end # end
end # end
alias_method :#{callback}_filter, :#{callback}_action
# Prepend a before, after or around callback. See _insert_callbacks
# for details on the allowed parameters.
def prepend_#{callback}_action(*names, &blk) # def prepend_before_action(*names, &blk)
_insert_callbacks(names, blk) do |name, options| # _insert_callbacks(names, blk) do |name, options|
set_callback(:process_action, :#{callback}, name, options.merge(:prepend => true)) # set_callback(:process_action, :before, name, options.merge(:prepend => true))
end # end
end # end
alias_method :prepend_#{callback}_filter, :prepend_#{callback}_action
# Skip a before, after or around callback. See _insert_callbacks
# for details on the allowed parameters.
def skip_#{callback}_action(*names) # def skip_before_action(*names)
_insert_callbacks(names) do |name, options| # _insert_callbacks(names) do |name, options|
skip_callback(:process_action, :#{callback}, name, options) # skip_callback(:process_action, :before, name, options)
end # end
end # end
alias_method :skip_#{callback}_filter, :skip_#{callback}_action
# *_action is the same as append_*_action
alias_method :append_#{callback}_action, :#{callback}_action # alias_method :append_before_action, :before_action
alias_method :append_#{callback}_filter, :#{callback}_action # alias_method :append_before_filter, :before_action
RUBY_EVAL
end
end
end
end
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