For example you make ajax request with json format to the server. And assume we have to render some partial in the controller or view and return it in json object. In the view you may have code like this:
In the Rails 2 you could pass format as option in reder function and it fixed problem:
But in Rails 2 this is not working. But there is a fix this issue and it merged to the master. So, in rails 4 it indeed will work and signature for method will be like this:
To enable this feature in Rails 3 you can make monkey patch: just create new file config/initializers/renderer.rb in your application and paste there this code:
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