def single_content_for(name, content = nil, &block)
      @view_flow.set(name, ActiveSupport::SafeBuffer.new)
      content_for(name, content, &block)
    end
def single_content_for(name, content = nil, &block)
      @view_flow.set(name, ActiveSupport::SafeBuffer.new)
      content_for(name, content, &block)
    end
Helper for setting content_for in activity partial, needed to
 flush remains in between partial renders.