Make blank params[] nil

Question

When a user submits a form and leaves certain fields blank, they get saved as blank in the DB. I would like to iterate through the params[:user] collection (for example) an

Answer 1

You could do this using inject, which is obvious as to what is happening.

params = params.inject({}){|new_params, kv| 
  new_params[kv[0]] = kv[1].blank? ? nil : kv[1]
  new_params
}

There is also a hack you can do with merge by merging with itself, and passing a block to handle the new value (although this isn't really the intended use for it, but it is more concise)

params.merge(params){|k, v| v.blank? ? nil : v}