Active Model
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ActiveModel is a gem that provides common interfaces and functionality for model classes, including validation, dirty tracking, callbacks, and serialization. It includes modules like ActiveModel::Validations, ActiveModel::Dirty, and ActiveModel::Callbacks that define APIs for validations, detecting changes, and hooks. While part of Rails, ActiveModel can also be used independently with the 'activemodel' gem. It provides fundamental modeling frameworks that both ActiveRecord and other ORM/ODM gems are built upon.
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The document outlines the contents of a Selenium automation testing course, including 30 hours of lessons on topics like introduction to automation testing, Selenium IDE, Selenium Core, JavaScript, Java fundamentals, Eclipse, FireBug, XPath, Selenium RC, Selenium Grid, Selenium WebDriver, TestNG, JUnit, AutoIT, frameworks, and more. The course also provides materials, interview questions, resume assistance, and help with job interviews.
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Active Model
- 2. Gem Spec • Part of Rails gem package • Own standalone gem: • gem ‘activemodel’ • Dependencies: • gem ‘activesupport’
- 3. ActiveModel Packages • ActiveModel::AttributeMethods • ActiveModel::Callbacks • ActiveModel::Conversion • ActiveModel::Dirty • ActiveModel::Naming • ActiveModel::Observer • ActiveModel::Serialization • ActiveModel::Translation • ActiveModel::Validations
- 4. ActiveModel Packages • ActiveModel::AttributeMethods • ActiveModel::Callbacks • ActiveModel::Conversion • ActiveModel::Dirty • ActiveModel::Naming • ActiveModel::Observer • ActiveModel::Serialization • ActiveModel::Translation • ActiveModel::Validations
- 5. Validations • Most Rails validations originate from ActiveModel • Including ActiveModel::Validations gives you • #valid? • #errors • Class methods for validation API
- 6. Validations API declarative • validates_acceptance_of • validates_exclusion_of • validates_confirmation_of • validates_length_of • validates_each • validates_numericality_of • validates_format_of • validates_presence_of • validates_inclusion_of • validates_with
- 7. Validations API short form • validates :field_name, :validator => options
- 8. Validation API • validates_each :field_name, &block • validate :method_name • validate &block • validates_with ValidatorClass
- 9. Callbacks • In ActiveRecord, this is how before_create, after_create and around_create are made. • Two different steps: register callbacks and execute callbacks.
- 10. Observers • Use observers to decouple logic from models. • Observers use convention to identify targets: ModelObserver observes Model unless explicitly overridden.
- 11. Serialization • Allows for models to define how they would like to be serialized in a variety of formats (including XML and JSON). • Important for creation of presenters that get sent as JSON in RESTful API.
- 12. Dirty • ActiveModel provides an API for detecting whether an object is “dirty” or not (changed). • Could be useful for operations that may or may not be idempotent and you need to know which (e.g. marking a message as read).
- 13. Questions?
Editor's Notes
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