Writing the Renderer
At the beginning of this chapter, we briefly discussed the render method and a few options that it accepts, but we haven’t 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. Let’s consider the :json renderer in Rails source code as an example:
| rails/actionpack/lib/action_controller/metal/renderers.rb | |
| | add :json do |json, options| |
| | json = json.to_json(options) unless json.kind_of?(String) |
| | if options[:callback].present? |
| | self.content_type ||= Mime::JS |
| | "#{options[:callback]}(#{json})" |
| | else |
| | self.content_type ||= Mime::JSON |
| | json |
| | end |
| | end |
So, whenever we invoke the ...
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