How to convert param to hash with Rails controller (updated from time to time)

class MyController < ApplicatinoController
  def my_action
    #
    hash_of(params[:some_key]) #call
    #
    head: :no_content
  end

  private
  def hash_of(param)
    case param
    when Hash              #I haven't checked if there really is a hash.
      param
    when String
      JSON.parse(param)    #Throw an error if it's not a JSON string
    when ApplicationController::Parameters
      param.to_unsafe_h
    end
  end
end

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