ActiveRecord

Нистратов Артём

anistratov@go-promo.ru

Validations

validates :email,

presence: true

    uniqunesses: true

    acceptance: true

    acceptance: { accept: 'yes' }

    confirmation: true

    format: {
        with: EMAIL_REGEX
    }

        message: "Невалидный Email"
    }

{ scope: :name }

length: { in: 5..200 }

length: {

    minimum: 10,

    maximum: 200,

    too_long: '%{count} too long',

    too_short: '%{count} too short'
}

    tokenizer: lambda { |str|
        str.split(/\s+/)
    },

numericality: true

numericality: {

    only_integer: true,

    greater_than: 10,

    greater_than_or_equal_to: 10,

    equal_to: 15,

    less_than: 100,

    less_than_or_equal_to: 100,

    odd: true,

    even: true
}

validates :nickname, allow_nill: true

allow_blank: true

validates :rules,
    acceptance: true,
    on: :create

    on: [:create, :publish]

record.valid? :publish

Proc.new do |*args|
  ...
end

proc { |*args| ... }

lambda { |*args| ... }

-> (*args) { ... }

Proc

validates :content,
    if: :content_changed?

validates :title, presence: true,
  if: -> (snippet) { snippet.public? }

validates :first_name, :last_name,
    presence: true,
    unless: "nickname.present?"

validate :langs_count

def langs_count
  if langs.count > 3
    errors.add :langs,
     'Указано слишком много языков'
  end
end

Validators

class ContentChecks < ActiveModel::Validator
  def validate(record)
    ...
    record.errors.add :content, 'Все плохо'
    ...
  end
end

validate_with ContentChecks

Callbacks

before_create do
  ...
end

before_save :recalculate_dates,
    if: :event_at_changed?

def recalculate_dates
  ...
end

after_validation :check_permissions,
    if: -> (record) { ... }

after_commit :send_message,
    on: :create

save context: :publish

around_save do
  ...
  yield
  ...
end

has_many :snippets,
    after_add:    :update_statistic,
    after_remove: :update_statistic

after_initialize :set_defautls

after_touch :log

belongs_to :user, touch: true

class AuditCallbacks
  def before_save
    # log :changes
  end

  def after_destroy
    # log delete
  end
end

audit = AuditCallbacks.new
after_destroy audit
after_save    audit

class AuditObserver < ActiveRecord::Observer
  observe :snippet, :user
end


  def before_save(record)
    # log record.changes
  end

end

third