How to tell which format a controller has resolved to render

Question

In a rails controller action with the following code:

respond_to do |format|
  format.json{ render :json=>  {:status => 200, :response=>@some_resource} }
  format.html { redirect_to(some_resource_path)}
end

How can I log the format the controller will resolve i.e. 'HTML' or 'json'? format is of type Collector. Is there a way of getting a string denoting the format?

Algebraist

try params[:format] #1671611 – Peroxy

Answer 1

The method to access the format is:

controller.request.format

Unformed

Thanks Anil. So from the controller it is just request.format. – Algebraist

Better to use request.format, because controller.request.format throws undefined local variable or method `controller' – Jepson

Answer 2

in your controller you can do:

request.format
request.format.html?
request.format.js?
request.format.json?
# etc.

Oneiric

I can't find any documentation on the available types or how they are built. Do you know where this is defined? – Griceldagrid

Using the byebug gem in my controller, I was able to type formats in the debug session and I got this output: [:js, :html, :text, :css, :ics, :csv, :vcf, :vtt, :png, :jpeg, :gif, :bmp, :tiff, :svg, :mpeg, :mp3, :ogg, :m4a, :webm, :mp4, :otf, :ttf, :woff, :woff2, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip, :gzip] See this documentation: guides.rubyonrails.org/layouts_and_rendering.html – Damning