Flowdock
method

respond_to

Importance_2
respond_to(*mimes) public

Defines mime types that are rendered by default when invoking respond_with.

Examples:

respond_to :html, :xml, :json

Specifies that all actions in the controller respond to requests for :html, :xml and :json.

To specify on per-action basis, use :only and :except with an array of actions or a single action:

respond_to :html
respond_to :xml, :json, :except => [ :edit ]

This specifies that all actions respond to :html and all actions except :edit respond to :xml and :json.

respond_to :json, :only => :create

This specifies that the :create action and no other responds to :json.

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November 19, 2014
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Also useful without respond_with

Using the class method #respond_to allows controller-level specification of the allowed mime-types. Without #respond_with , it enables a

Completed 406 Not Acceptable

response rather than

ActionView::MissingTemplate

error when an unsupported type is requested.

See: http://www.justinweiss.com/blog/2014/11/03/respond-to-without-all-the-pain/