Understanding Responders
To understand the concepts behind responders, we must understand the three variables that affect how controllers respond: request type, HTTP verb, and resource status.
Navigational and API Requests
A controller the scaffold generator creates responds to two formats by default: HTML and JavaScript Object Notation (JSON). The scaffold generator uses these two formats because they represent two types of requests: navigational and API. The former is handled by a browser and holds formats like HTML and MOBILE, whereas the latter is used by machines and represents formats like XML and JSON.
| | def index |
| | @users = User.all |
| | respond_to do |format| |
| | format.html # index.html.erb |
| | format.json { render json: @users } |
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