CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3.2
user1899082
user1899082

Reputation:

Where does a "render" in the controller action method go to?

I am looking at a code that in one of its controllers, in one of its action methods first it calls a service to get a JSON, puts it in a json_data varaible and as for the next and last command says render json: json_data

But I can't understand what happens after that? what is the next line of code that gets run?

Upvotes: 0

Views: 182

Answers (1)

zeantsoi
zeantsoi

Reputation: 26193

render json: json_data is in fact the final statement executed in the function. After it's executed, the function is automatically exited.

Whenever something is "rendered" in a Rails controller, whether it's an action, a template, or otherwise, the rendering is the final executed statement in the controller function.

In the case of the render json: json_data, ActionController will render out the passed argument, json_data, by whatever method is defined. In this case, it's JSON, so Rails renders the contents of json_data to the browser in JSON format, complete with respective headers. To contrast, if the statement was render text: json_data, ActionController would send the contents of json_data to the browser as text.

You may want to check out the canonical Rails guide's documentation on render, which provides several examples of it can be invoked within the context of a controller action.

Upvotes: 4

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