What is the best way to convert all controller params from camelCase to snake_case in Rails?

Question

As you already know, JSON naming convention advocates the use of camelSpace and the Rails advocates the use of snake_case for parameter names.

What is the best way t

Answer 1

I wanted to use Chris Healds version, but since I am using Rails 4 I have strong_parameters enabled so I had to change it up a bit.

This is the version that I came up with:

before_filter :deep_underscore_params!


def deep_underscore_params!(val = request.parameters)
  case val
  when Array
    val.map { |v| deep_underscore_params!(v) }
  when Hash
    val.keys.each do |k, v = val[k]|
      val.delete k
      val[k.underscore] = deep_underscore_params!(v)
    end

    params = val
  else
    val
  end
end