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# encoding: utf-8
module Origin
# Allows for easy delegation of origin queryable instance methods to a
# specific method.
module Forwardable
# Tells origin with method on the class to delegate to when calling an
# original selectable or optional method on the class.
#
# @example Tell origin where to select from.
# class Band
# extend Origin::Forwardable
# select_with :criteria
#
# def self.criteria
# Query.new
# end
# end
#
# @param [ Symbol ] receiver The name of the receiver method.
#
# @return [ Array<Symbol> ] The names of the forwarded methods.
#
# @since 1.0.0
def select_with(receiver)
(Selectable.forwardables + Optional.forwardables).each do |name|
__forward__(name, receiver)
end
end
private
# Forwards the method name to the provided receiver method.
#
# @api private
#
# @example Define the forwarding.
# Model.__forward__(:exists, :criteria)
#
# @param [ Symbol ] name The name of the method.
# @param [ Symbol ] receiver The name of the receiver method.
#
# @since 1.0.0
def __forward__(name, receiver)
if self.class == Module
module_eval <<-SEL
def #{name}(*args, &block)
#{receiver}.__send__(:#{name}, *args, &block)
end
SEL
else
(class << self; self; end).class_eval <<-SEL
def #{name}(*args, &block)
#{receiver}.__send__(:#{name}, *args, &block)
end
SEL
end
end
end
end
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