Writing the Renderer
At the beginning of this chapter, we briefly discussed the render method and a few options that it accepts, but we havenât formally described what a renderer is.
A renderer is nothing more than a hook exposed by the render method to customize its behavior. Adding our own renderer to Rails is quite simple. Letâs consider the :json renderer in Rails source code as an example:
| rails/actionpack/lib/action_controller/metal/renderers.rb | |
| â | add :json âdoâ |json, options| |
| â | json = json.to_json(options) âunlessâ json.kind_of?(String) |
| â | âifâ options[:callback].present? |
| â | self.content_type ||= Mime::JS |
| â | â"â#{options[:callback]}â(â#{json}â)"â |
| â | âelseâ |
| â | self.content_type ||= Mime::JSON ... |
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