Today I Learned

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Group Related ActiveRecord Validations

Today I learned about the with_options feature of ActiveRecord. It's used to group validations together in a block. You could use it to transform code like this:

class User < ApplicationRecord
  validates :password, length: { minimum: 10 }, if: :is_admin?
  validates :email, presence: true, if: :is_admin?

Into this:

class User < ApplicationRecord
  with_options if: :is_admin? do |admin|
    admin.validates :password, length: { minimum: 10 }
    admin.validates :email, presence: true

A use case for this might be a collection of validations that should only be checked when a boolean feature flag like enabled? is true.

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