module DependentFieldsFrameHelper

def accept_query_string_override_for(form, method)
  field_name = form.field_name(method)
  new_value = new_value_from_query_string(field_name)
  return if new_value.nil?
  form.object.send(:"#{method}=", new_value)
end

def new_value_from_query_string(field_name)
  params.dig(*params_dig_path_for_field_name(field_name))
end

def params_dig_path_for_field_name(field_name)
  dig_path = []
  nested_keys = Rack::Utils.parse_nested_query(field_name)
  while !nested_keys.nil? && nested_keys.keys.size
    key = nested_keys.keys.first
    dig_path << key.to_sym
    nested_keys = nested_keys[key]
  end
  dig_path
end