Rails Routes – Limiting the available formats for a resource

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You must wrap those routes in a scope. Constraints unfortunately don’t work as expected in this case.

This is an example of such a block…

scope :format => true, :constraints => { :format => 'json' } do
  get '/bar' => "bar#index_with_json"
end

More information can be found here: https://github.com/rails/rails/issues/5548

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