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model_validations

🔒 Validations in Models​

Model validations help ensure data integrity before saving records. Place validations in your model to automatically check attributes and return errors if they’re invalid.

class User < ApplicationRecord
  # Ensure email is present and unique
  validates :email, presence: true, uniqueness: true

  # Validate format with a regex
  validates :email, format: { with: URI::MailTo::EMAIL_REGEXP, message: "invalid email" }
end

Use user.valid? to run validations without saving, and user.errors.full_messages to inspect errors.