What is the purpose of ActiveRecord?

Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database. It is an implementation of the Active Record pattern which itself is a description of an Object Relational Mapping system.

What is ActiveRecord in Ruby on Rails?

Rails Active Records provide an interface and binding between the tables in a relational database and the Ruby program code that manipulates database records. Each Active Record object has CRUD (Create, Read, Update, and Delete) methods for database access.

What is ActiveRecord PHP?

Active Record. An object that wraps a row in a database table or view, encapsulates the database access, and adds domain logic on that data. An object carries both data and behavior. Much of this data is persistent and needs to be stored in a database.

Why do we need migration in Rails?

The main purpose of Rails’ migration feature is to issue commands that modify the schema using a consistent process. Migrations can also be used to add or modify data. This is useful in an existing database that can’t be destroyed and recreated, such as a production database.

What are the main functions of active record?

Active Record gives us several mechanisms, the most important being the ability to: Represent models and their data. Represent associations between these models. Represent inheritance hierarchies through related models. Validate models before they get persisted to the database. Perform database operations in an object-oriented fashion.

Why do I need ActiveRecord on my database?

No one knows!” ActiveRecord is great. Really, it is. But it’s an abstraction, intended to insulate you from the actual SQL queries being run on your database. And, if you don’t understand how ActiveRecord works, you may be causing SQL queries to run that you didn’t intend to.

What’s the difference between rails engine and ActiveRecord?

While it may seem the same in basic Rails applications, there actually is an important difference once you begin to use rails engines, plugins / gems or direct methods from ActiveRecord::Base.

How does ActiveRecord use caching to avoid unnecessary trips?

ActiveRecord makes accessing your database easy, but it can also help make it faster by its intelligent use of caching. In this article, Jonathan Miles shows us the tricks that Rails uses to ensure that your database isn’t doing more work than it needs to.