class Devise::ParamFilter

def filter(conditions)
  conditions = stringify_params(conditions.dup)
  @case_insensitive_keys.each do |k|
    value = conditions[k]
    next unless value.respond_to?(:downcase)
    conditions[k] = value.downcase
  end
  @strip_whitespace_keys.each do |k|
    value = conditions[k]
    next unless value.respond_to?(:strip)
    conditions[k] = value.strip
  end
  conditions
end