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Versions: 10
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Contents
class Module
# Encapsulates the common pattern of ...
#
# alias_method :foo_without_feature, :foo
# alias_method :foo, :foo_with_feature
#
# With this, you simply do ...
#
# alias_method_chain :foo, :feature
#
# For example
#
# class AliasMethodChainExample
# def foo
# "foo"
# end
#
# def foo_with_feature
# "foo!"
# end
#
# alias_method_chain :foo, :feature
# end
#
# And both aliases are set up for you.
#
# example = AliasMethodChainExample.new
# example.foo #=> "foo!"
# example.foo_without_feature #=> "foo"
#
# Query and bang methods (foo?, foo!) keep the same punctuation ...
#
# alias_method_chain :foo?, :feature
#
# is equivalent to ...
#
# alias_method :foo_without_feature?, :foo?
# alias_method :foo?, :foo_with_feature?
#
# so you can safely chain foo, foo?, and foo! with the same feature.
#
# CREDIT: Bitsweat, Rails Team
def alias_method_chain(target, feature)
# Strip out punctuation on predicates or bang methods since
# e.g. target?_without_feature is not a valid method name.
aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
yield(aliased_target, punctuation) if block_given?
with_method, without_method = "#{aliased_target}_with_#{feature}#{punctuation}", "#{aliased_target}_without_#{feature}#{punctuation}"
alias_method without_method, target
alias_method target, with_method
case
when public_method_defined?(without_method)
public target
when protected_method_defined?(without_method)
protected target
when private_method_defined?(without_method)
private target
end
end
end
Version data entries
10 entries across 9 versions & 2 rubygems