Normalize Attributes

Sometimes you want to normalize data before saving it to the database like downcasing e-mails, removing spaces and so on. This Rails plugin allows you to do so in a simple way.

To install:

gem install normalize_attributes

Then on your model:

class User < ActiveRecord::Base
  normalize :email, with: :downcase
end

The example above will normalize your :email attribute on the before_save callback.

You can specify multiple attributes

normalize :email, :username, with: :downcase

You can use a block

normalize :name do |value|
  value.squish
end

You can combine both

normalize :name, with: :downcase do |value|
  value.squish
end

The squish method is the default normalizer for strings. All you need to is specify the attribute:

normalize :content

The compact method is the default normalizer for arrays (when using serialize method):

class User < ActiveRecord::Base
  serialize :preferences, Array
  normalize :preferences
end

The normalize method is aliased as normalize_attributes, normalize_attribute, normalize_attr, and normalize_attrs.

You can normalize the attribute before type casting; this is specially useful for normalizing dates and numbers.

class Product
  normalize(:price, raw: true) {|v| Money.new(v).to_f }
end

You can also use it with ActiveModel::Model classes.

class UserForm
  include ActiveModel::Model
  include ActiveModel::Attributes
  include ActiveModel::Validations::Callbacks
  include NormalizeAttributes::Callbacks

  attribute :username
  normalize :username
end

• Nando Vieira

• https://github.com/fnando/normalize_attributes/contributors

For more details about how to contribute, please read https://github.com/fnando/normalize_attributes/blob/main/CONTRIBUTING.md.

The gem is available as open source under the terms of the MIT License. A copy of the license can be found at https://github.com/fnando/normalize_attributes/blob/main/LICENSE.md.

Everyone interacting in the normalize_attributes project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.