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体验新版 GitCode,发现更多精彩内容 >>
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ed9a183e
编写于
6月 14, 2010
作者:
N
Neeraj Singh
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差异文件
clearer documentation of how scope applies to ActiveSupport callbacks
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f587dec2
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+32
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activesupport/lib/active_support/callbacks.rb
activesupport/lib/active_support/callbacks.rb
+32
-20
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activesupport/lib/active_support/callbacks.rb
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@@ -530,28 +530,40 @@ def reset_callbacks(symbol)
# the given block or an before_filter raises an error. Supply :rescuable => true
# to change this behavior.
#
# * <tt>:scope</tt> -
Show
which methods should be executed when a class
# * <tt>:scope</tt> -
Indicates
which methods should be executed when a class
# is given as callback:
#
# define_callbacks :filters, :scope => [ :kind ]
#
# When a class is given:
#
# before_filter MyFilter
#
# It will call the type of the filter in the given class, which in this
# case, is "before".
#
# If, for instance, you supply the given scope:
#
# define_callbacks :validate, :scope => [ :kind, :name ]
#
# It will call "#{kind}_#{name}" in the given class. So "before_validate"
# will be called in the class below:
#
# before_validate MyValidation
#
# Defaults to :kind.
# class Audit
# def before(caller)
# puts 'Audit: before is called'
# end
# def before_save(caller)
# puts 'Audit: before_save is called'
# end
# end
#
# class Account
# include ActiveSupport::Callbacks
# define_callbacks :save
# set_callback :save, :before, Audit.new
# def save
# run_callbacks :save do
# puts 'save in main'
# end
# end
# end
#
# In the above case if you execute Account.new.save then method "before" of Audit class
# will be called. Now change the class "Account" and pass "scope" to method "define_callbacks".
#
# define_callbacks :save, :scope => [:kind, :name]
#
# Now if you invoke Account.new.save then method "before_save" of Audit will be called
# instead of method "before".
#
# When you do not pass any scope then the default value of scope ":kind" is implicitly being
# passed. In the above case method "before_save" is constructed by calling "#{kind}_#{name}"
# in the given class. In this case "kind" is "before" and "name" is "save".
#
def
define_callbacks
(
*
callbacks
)
config
=
callbacks
.
last
.
is_a?
(
Hash
)
?
callbacks
.
pop
:
{}
...
...
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