[Rails] Injector Directives

[Lou Henry Alvarez]

Continuing with our series: This time around we want to start a series
on Injector Directives.  We will begin by showing injector code
pre-withdrawal and then its subsequent re-instatement...

          facet :PreFunction do
            def pre
              puts '++++++++++'
            end
          end

          jack :PosFunction do
            def pos
              puts '=========='
            end
          end

          # Our class

          class Model

            inject PreFunction(:silence)
            inject PosFunction(:silence)

            def meth arg
              pre
              puts arg * arg
              pos
            end
          end
          obj = Model.new

          ############################
          # functionality is silent !!

          obj.meth( 2 )
          # ==> 4

          ############################
          # functionality is activated

          PreFunction(:active)
          PosFunction(:active)

          obj.meth( 2 )
          # ==> ++++++++++
          # ==> 4
          # ==> ==========

For more on this, please visit:
http://blog.jackbox.us/2015/10/injector-directives-collapse-and-rebuild.html


Thanks for all your support,

lha

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