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体验新版 GitCode,发现更多精彩内容 >>
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94de5b8c
编写于
6月 14, 2010
作者:
X
Xavier Noria
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edit pass in #define_callbacks rdoc
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e4c8bc1b
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20 deletion
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activesupport/lib/active_support/callbacks.rb
activesupport/lib/active_support/callbacks.rb
+22
-20
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activesupport/lib/active_support/callbacks.rb
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94de5b8c
...
...
@@ -449,7 +449,9 @@ def __update_callbacks(name, filters = [], block = nil) #:nodoc:
# we convert :only and :except conditions into per-key conditions.
#
# before_filter :authenticate, :except => "index"
#
# becomes
#
# dispatch_callback :before, :authenticate, :per_key => {:unless => proc {|c| c.action_name == "index"}}
#
# Per-Key conditions are evaluated only once per use of a given key.
...
...
@@ -510,33 +512,33 @@ def reset_callbacks(symbol)
__define_runner
(
symbol
)
end
# Define callbacks types.
#
# ==== Example
# Defines callbacks types:
#
# define_callbacks :validate
#
#
==== Options
#
This macro accepts the following options:
#
# * <tt>:terminator</tt> - Indicates when a before filter is considered
# to be halted.
#
# define_callbacks :validate, :terminator => "result == false"
#
# In the example above, if any before validate callbacks returns false,
# other callbacks are not executed. Defaults to "false".
# In the example above, if any before validate callbacks returns +false+,
# other callbacks are not executed. Defaults to "false", meaning no value
# halts the chain.
#
# * <tt>:rescuable</tt> - By default, after filters are not executed if
# the given block or a
n before_filter raises an error. Supply :rescuable => true
# to change this behavior.
# the given block or a
before filter raises an error. Set this option to
# t
rue t
o change this behavior.
#
# * <tt>:scope</tt> - Indicates which methods should be executed when a class
# is given as callback
:
# is given as callback
. Defaults to <tt>[:kind]</tt>.
#
# class Audit
# def before(caller)
# puts 'Audit: before is called'
# end
#
# def before_save(caller)
# puts 'Audit: before_save is called'
# end
...
...
@@ -544,8 +546,10 @@ def reset_callbacks(symbol)
#
# class Account
# include ActiveSupport::Callbacks
#
# define_callbacks :save
# set_callback :save, :before, Audit.new
#
# def save
# run_callbacks :save do
# puts 'save in main'
...
...
@@ -553,22 +557,20 @@ def reset_callbacks(symbol)
# 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".
#
In the above case whenever you save an account the method <tt>Audit#before</tt> will
#
be called. On the other hand
#
# 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".
# would trigger <tt>Audit#before_save</tt> instead. That's constructed by calling
# <tt>"#{kind}_#{name}"</tt> on the given instance. In this case "kind" is "before" and
# "name" is "save".
#
# 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".
# A declaration like
#
# Although ":kind" is the default scope that is passed, it is possible to not to make use of ":kind".
# define_callbacks :save, :scope => [:name] . A declaration like this would call "save" method of
# Audit class since ":kind" is skipped.
# define_callbacks :save, :scope => [:name]
#
# would call <tt>Audit#save</tt>.
#
def
define_callbacks
(
*
callbacks
)
config
=
callbacks
.
last
.
is_a?
(
Hash
)
?
callbacks
.
pop
:
{}
...
...
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