[Rails] Submit multiple checkboxes as a hash :id => boolean

submit-checkbox-as-hash.rb

# In the rails controller something like:
def _params
  params.permit(:param1, :param2).tap do |whitelisted|
    # because submitting objects is optional
    (whitelisted[:objects] = params[:objects]) if params[:objects]
  end
end

# summary_params['objects'] => {'object.id' => 'boolean-valu'} 

=begin
Works with code something like:
Was written for liquid template
{% for object in objects %}
  <fieldset>
    <label>
      <input type="hidden"
              name="objects[{{object.id}}]"
              value="0"
      />
      <input type="checkbox"
              name="objects[{{object.id}}]"
              id="{{object.id}}"
              value="1"
              {% if object.enabled %} checked="checked" {% endif %}
      />
    </label>
  </fieldset>
{% endfor %}
=end