This document summarizes key aspects of Rails 2 including migrations, validation, controllers, views, partials, database tasks using Rake, working with tables and columns, model relationships, validation helpers, callbacks, filters, and controller responses. It outlines the main functions and purposes of migrations, validation, controllers, views, and models in Rails.

1. RoR – Rails 2
● Миграции
● Валидация
● Контроллер
● Отображение
● Partial

2. Rake таски
● rake db:migrate
● rake db:migrate:rollback
● rake db:migrate:redo
● rake db:migrate:rollback STEP=3
● rake db:migrate:redo STEP=3
● rake db:migrate:up VERSION=xxxxxxxxxxxxx
● rake db:migrate:down VERSION=xxxxxxxxxxxx

3. Работа с таблицами
● Операции с таблицами
create_table, drop_table, change_table
● Операции с колонками:
add_column, change_column, change_column_default,
rename_column, remove_column, add_index,
remove_index
● Типы полей:
:primary_key, :string, :text, :integer, :float, :decimal,
:datetime, :timestamp, :time, :date, :binary, :boolean

4. Связи между моделями
● belongs_to
● has_one
● has_many
● has_many :through
● has_one :through
● has_and_belongs_to_many

5. Валидации
● Валидации проверяются при вызове:
create, create!, save, save!, update, update_attributes,
update_attributes!
● Не проверяются для:
decrement!, decrement_counter, increment!,
increment_counter, toggle!, update_all, update_attribute,
update_counters
● Проверка валидности объекта:
valid? and invalid?
● Получить массив ошибок
entity.errors[:attribute]

6. Хелперы
● validates_acceptance_of
● validates_associated
● validates_confirmation_of
<%= text_field :person, :email %>
<%= text_field :person, :email_confirmation %>
● validates_exclusion_of, validates_inclusion_of
validates_exclusion_of :field, :in => [values], :message =>
'message'
● validates_format_of
validates_format_of :field, :with => /Regexp/,
:message => "message"

7. Хелперы
● validates_length_of
:minimum, :maximum, :in, :is
● validates_numericality_of (:only_integer => true)
● validates_uniqueness_of (:scope => :attribute)
● validate :validate_method
def validate_method
end
● пр.

8. Callbacks
● before_validation
● after_validation
● before_save
● after_save
● before_update
● around_update
● after_update
● before_destroy
● after_destroy
● around_destroy
● around_destroy

9. Котроллеры → фильтры
● before_filter
● after_filter
● around_filter

10. Controller → response
● render
● redirect_to to
● head