ActiveModel::Validations::Reflection extends ActiveModel reflection capabilities on validations.
ActiveModel::Validations::Reflection is distributed as a gem and available on rubygems.org so you can add it to your Gemfile or install it manually with:
gem install active_model_validations_reflectionActiveModel, at least since 3.0, provide a basic mechanism to inspect validations on a model through ActiveModel::Validations::ClassMethods#validators and ActiveModel::Validations::ClassMethods#validators_on.
This extends it with easier filtering on validators on class level and contextual filtering on instance level.
.validators_of_kinds & .validators_on_of_kinds are class methods to filter validators by kind, respectively on all or a single attribute.
Any kind supported by validates (:presence , :inclusion, :uniqueness, or custom validator's kind) can be used to filter validators.
class Article < ApplicationRecord
include ActiveModel::Validations::Reflection
validates :date,
presence: true,
timeliness: { type: :date }
end
Article.validators_of_kinds(:presence)
# => [#<ActiveModel::Validations::PresenceValidator […]>]
Article.validators_on_of_kinds(:date, :timeliness)
# => [#<ValidatesTimeliness::Validator […]>]Same as the above two but only return validators without conditions (:if / :unless).
class Article < ApplicationRecord
include ActiveModel::Validations::Reflection
enum :status, %i[draft published]
validates :date,
presence: true,
timeliness: { type: :date, if: :published? }
end
Article.validators_of_kinds(:presence)
# => [#<ActiveModel::Validations::PresenceValidator […]>]
Article.validators_on_of_kinds(:date, :timeliness)
# => []Returns validator that will be applied considering the instance current state: flat validators and conditional validators whose condition is met.
class Article < ApplicationRecord
include ActiveModel::Validations::Reflection
enum :status, %i[draft published]
validates :date,
presence: true,
timeliness: { type: :date, if: :published? }
end
article = Article.new
article.relevant_validators
# => [#<ActiveModel::Validations::PresenceValidator […]>]
article.relevant_validators_on(:date)
# => [#<ActiveModel::Validations::PresenceValidator […]>]
article.status = :published
article.relevant_validators_on(:date)
# => [#<ActiveModel::Validations::PresenceValidator […]>, #<ValidatesTimeliness::Validator […]>]Bug reports and pull requests are welcome on GitHub at https://github.com/notus-sh/active_model_validations_reflection.
