64 lines
1.6 KiB
Ruby
64 lines
1.6 KiB
Ruby
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# -*- encoding : utf-8 -*-
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require "decorates_before_rendering/version"
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require 'active_support/core_ext/string/inflections'
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require 'active_support/core_ext/class/attribute'
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# Decorates the specified fields. For instance, if you have
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#
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# class StuffController < ApplicationController
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# include DecoratesBeforeRendering
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#
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# decorates :thing_1, :thing_2
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# end
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#
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# @thing_1 and @thing_2 will be decorated right before a rendering occurs.
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#
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module DecoratesBeforeRendering
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module ClassMethods
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def decorates(*unsigiled_ivar_names)
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self.__ivars_to_decorate__ = unsigiled_ivar_names.map { |i| "@#{i}" }
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end
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end
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def render(*args)
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__decorate_ivars__
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super(*args)
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end
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private
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def __decorate_ivars__
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ivars_to_decorate = self.class.__ivars_to_decorate__
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return if ivars_to_decorate.nil?
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ivars_to_decorate.each do |ivar_name|
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ivar = instance_variable_get(ivar_name)
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instance_variable_set(ivar_name, __decorator_for__(ivar)) unless ivar.nil?
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end
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end
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def __decorator_for__(ivar)
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__decorator_name_for__(ivar).constantize.decorate(ivar)
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end
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def __decorator_name_for__(ivar)
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"#{__model_name_for__(ivar)}Decorator"
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end
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def __model_name_for__(ivar)
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if ivar.respond_to?(:model_name)
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ivar
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elsif ivar.class.respond_to?(:model_name)
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ivar.class
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else
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raise ArgumentError, "#{ivar} does not have an associated model"
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end.model_name
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end
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def self.included(base)
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base.class_attribute :__ivars_to_decorate__, :instance_accessor => false
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base.extend ClassMethods
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end
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end
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