ActiveValidation

Extend ActiveModel validations, which introduce validations with versions and allows to manage validations of the records dynamically.

With ActiveValidation instead of storing all validations hardcoded in the Model, you can also store them in the database. Validation Manifests are lazy loaded once, and only when they required so it does not affect the performance.

Require

Ruby 2.4+ ActiveModel ~> 5.0

Supported ORM:

• ActiveRecord ~> 5.0

Why and for whom is it

• For those who have to manage the states from the dynamic actions
• For those who does not want to worry if the migration pass on the production
• For those who have to maintain huge DB with tons of possible acceptable legacy validation issues
• Your option

Overview

This is the add-on for ActiveModel validations. The gem allows to store ActiveModel validations in some backend, like DB. Each record with ActiveValidation belongs to ActiveValidation::Manifest which holds general information about the validation, including name, version and id. Assumed, that ActiveValidation::Manifest's with the same version are compatible and share the same validation methods. Folder structure example for model MyModelName:

.
└── app
    └── models
        ├── my_model_name
        │   └── validations
        │       └── v1.rb
        └── my_model_name.rb

for different versions of the records. Validation versions are stored in the selected backend. Validations themselves are stored in ActiveValidation::Check, 1 validation per one record. ActiveValidation::Manifest has many ActiveValidation::Check's.

Manifest's and Check's are immutable by design. Instead of updating or patching the existed objects the developer should clone and create the new record.

It is assumed that inside one version manifests are compatible. Verifier version is a border between new version and the existed one, which allows co-existing of both versions at the same time.

To control ActiveValidation::Manifest's there is ActiveValidation::Verifier class. Each model with activated ActiveValidation has one corresponding ActiveValidation::Verifier instance (which can easily taken with MyModelName.active_validation method). Through this instance user can add or find Minifest(s).

Installation

Add this line to your application's Gemfile:

gem 'active_validation'

Also will be required create dependent tables in the migration.

ActiveRecord

  create_table :active_validation_manifests do |t|
	t.string   :name
	t.string   :version
	t.string   :base_klass

	t.datetime :created_at
  end

  create_table :active_validation_checks do |t|
	t.integer    :manifest_id
	t.string     :type
	t.string     :argument

	t.json       :options

	t.datetime   :created_at
  end

Quick start

Initial configuration

ActiveValidation.configuration do |c|
  c.orm_adapter = :active_record
end

# app/models/foo
class Foo < ActiveRecord::Base
  active_validation

#  active_validation do |verifier|          # this is a form with optional block
# 	verifier.manifest = some_manifest       # lock manifest to some particular existed manifest
# 	verifier.version = 42 			        # lock version
# 	verifier.orm_adapter = :active_record	# ORM adapter name
#  end
end

The usage described in special spec. Only this way allows to keep it always up-to-date.

Configuration

You can manage default values with the configuration:

ActiveValidation.configuration do |c|
  c.manifest_name_formatter # You can set custom manifest name generator, see lib/active_validation/formatters/manifest_name_formatter.rb

  c.validation_context_formatter # You can set custom validation context generator, see lib/active_validation/formatters/validation_context_formatter.rb

  c.orm_adapter # currently supported `active_record`

  c.verifier_defaults do |v|
    v.validations_module_name # folder with validations versions, default: "Validations"

	v.failed_attempt_retry_time # Rate limiter for check of missing Manifest, default: `1 day`
  end
end

FAQ

License

The gem is available as open source under the terms of the MIT License.