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# Copyright 2007 by Domizio Demichelis
# This library is free software. It may be used, redistributed and/or modified
# under the same terms as Ruby itself
#
# This extension is used in order to expose the object of the implementing class
# to liquid as it were a Drop. It also limits the liquid-callable methods of the instance
# to the allowed method passed with the liquid_methods call
# Example:
#
# class SomeClass
# liquid_methods :an_allowed_method
#
# def an_allowed_method
# 'this comes from an allowed method'
# end
# def unallowed_method
# 'this will never be an output'
# end
# end
#
# if you want to extend the drop to other methods you can defines more methods
# in the class <YourClass>::LiquidDropClass
#
# class SomeClass::LiquidDropClass
# def another_allowed_method
# 'and this from another allowed method'
# end
# end
# end
#
# usage:
# @something = SomeClass.new
#
# template:
# {{something.an_allowed_method}}{{something.unallowed_method}} {{something.another_allowed_method}}
#
# output:
# 'this comes from an allowed method and this from another allowed method'
#
# You can also chain associations, by adding the liquid_method call in the
# association models.
#
class Module
def liquid_methods(*allowed_methods)
drop_class = eval "class #{self.to_s}::LiquidDropClass < Liquid::Drop; self; end"
define_method :to_liquid do
drop_class.new(self)
end
drop_class.class_eval do
def initialize(object)
@object = object
end
allowed_methods.each do |sym|
define_method sym do
@object.send sym
end
end
end
end
end
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