What's an equivalent way of performing the following (h is a Hash): h.each { |k,v| h.delete k if k.nil? }

In The Author Model, how do you create a nested association between Authors and Blogs?

Which is not a valid callback?

Determine the value of the variable a, b and c after the execution of the following code. a, b, c = 1, 2, 3, 4

In development mode (config.assets.digest = false), if a file exists in app/assets/javascript/hello.js, which link will show that file ?

If you're using the standard Rails RESTful routes, then which of the following actions map to the url, '/posts'?

Which is not an advantage of using an integrated development environment (IDE) for Rails ,compared with using a simple text editor?

How can the Heroku deprecation warning be removed from a Rails plugin that has been used?

What is TDD is rails3?

Which of these tools are for checking Ruby code styling?

The asset tag helpers do not verify the existence of the assets at the specified locations.