Optional validations for ActiveModel

This gem provides ability to exclude certain fields from validation process

You can install the gem by typing gem install optional_validations via your command line.

Or use it in your Gemfile:

gem 'optional_validations'

Example:

class User < ActiveRecord::Base
    validates_presence_of :email, :name, :address
end

user = User.new(params)     #suppose params contain only email
user.valid?                 #false

user.validate_only :email do
    user.valid?             #true
end

Thus every instance of ActiveModel::Validations now has the following methods:

1. validate_only(*fields) — change the set of fields that are validated
2. validate_except(*fields) — validate all fields except for specified ones

Make validate_except and validate_only return the value from passed blocks

Please note that this release introduces a major API change.

validate_all method removed

validate_only and validate_except now expect a block to be passed and will only affect the behavior of the block. Object's validations are restored after the block is processed.