module RSpec
  module Rails
    module ViewAssigns
      extend ActiveSupport::Concern

      module InstanceMethods
        # Assigns a value to an instance variable in the scope of the
        # view being rendered.
        #
        # == Examples
        #
        #   assign(:widget, stub_model(Widget))
        def assign(key, value)
          _encapsulated_assigns[key] = value
        end

        def view_assigns
          begin
            # TODO: _assigns was deprecated in favor of view_assigns after
            # Rails-3.0.0 was released. Since we are not able to predict when
            # the _assigns/view_assigns patch will be released (I thought it
            # would have been in 3.0.1, but 3.0.1 bypassed this change for a
            # security fix), this bit ensures that we do the right thing without
            # knowing anything about the Rails version we are dealing with.
            #
            # Once that change _is_ released, this can be changed to something
            # that checks for the Rails version when the module is being
            # interpreted, as it was before commit dd0095.
            super.merge(_encapsulated_assigns)
          rescue
            _assigns
          end
        end

        def _assigns
          super.merge(_encapsulated_assigns)
        end

      private

        def _encapsulated_assigns
          @_encapsulated_assigns ||= {}
        end
      end

    end
  end
end