Rails - How to add a format to an url helper?

You should be able to do something like this:

some_resource_path(format: :json)

some_resource_url(format: :xml)

ruby-on-rails request helper url-helper

I'm fairly new to Rails/Ruby, so I'm not sure why, but in my Rails 3.2 application the syntax must be eg:

some_resource_path(:format => :json)

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