Module: Parse::Validations

Defined in:

lib/parse/model/validations.rb,
lib/parse/model/validations/uniqueness_validator.rb

Overview

The Validations module provides custom validators for Parse::Object subclasses.

Parse Stack builds on ActiveModel::Validations, which means all standard Rails validations are available:

• ‘validates :field, presence: true`

• ‘validates :field, length: { minimum: 1, maximum: 200 }`

• ‘validates :field, numericality: { greater_than: 0 }`

• ‘validates :field, format: { with: /A@[a-zd-](.)*.[a-z]z/i }`

• ‘validates :field, inclusion: { in: %w[small medium large] }`

• ‘validates :field, exclusion: { in: %w[admin root] }`

In addition, Parse Stack provides:

• ‘validates :field, uniqueness: true` - Queries Parse to ensure uniqueness

Examples:

Full validation example

class User < Parse::Object
  property :email, :string
  property :username, :string
  property :age, :integer
  property :status, :string

  # Standard ActiveModel validations
  validates :email, presence: true,
                    format: { with: URI::MailTo::EMAIL_REGEXP }
  validates :username, presence: true,
                       length: { minimum: 3, maximum: 30 }
  validates :age, numericality: { greater_than_or_equal_to: 0 },
                  allow_nil: true
  validates :status, inclusion: { in: %w[active inactive pending] }

  # Parse-specific uniqueness validation
  validates :email, uniqueness: true
  validates :username, uniqueness: { case_sensitive: false }

  # Custom validation method
  validate :email_domain_allowed

  private

  def email_domain_allowed
    return if email.blank?
    domain = email.split('@').last
    unless %w[company.com partner.org].include?(domain)
      errors.add(:email, "must be from an allowed domain")
    end
  end
end

Validation callbacks

class Song < Parse::Object
  property :title, :string

  validates :title, presence: true

  before_validation :normalize_title
  after_validation :log_validation_result

  private

  def normalize_title
    self.title = title.strip.titleize if title.present?
  end

  def log_validation_result
    if errors.any?
      puts "Validation failed: #{errors.full_messages.join(', ')}"
    end
  end
end

Conditional validations

class Order < Parse::Object
  property :status, :string
  property :shipping_address, :string
  property :tracking_number, :string

  validates :shipping_address, presence: true, if: :requires_shipping?
  validates :tracking_number, presence: true, if: -> { status == "shipped" }

  def requires_shipping?
    status.in?(%w[processing shipped delivered])
  end
end

Defined Under Namespace

Classes: UniquenessValidator