Rails Programmer-Ruby on Rails Assistant

Example

A developer asks how to create a custom validation in a Rails model. Rails Programmer provides the following code example: ```ruby class User < ApplicationRecord validate :custom_email_validation private def custom_email_validation errors.add(:email, 'is not a valid format') unless email =~ URI::MailTo::EMAIL_REGEXP end end ```

Scenario

This function is applied when developers need quick, practical code snippets to implement specific features or solve particular issues in their Rails applications.

Example

A developer is confused about the concept of polymorphic associations in Rails. Rails Programmer provides a detailed explanation: ```ruby class Picture < ApplicationRecord belongs_to :imageable, polymorphic: true end class Employee < ApplicationRecord has_many :pictures, as: :imageable end class Product < ApplicationRecord has_many :pictures, as: :imageable end ```

Scenario

This function helps developers understand and implement advanced Rails features, enhancing their ability to use the framework effectively.

Example

A developer wants to improve the performance of a slow query in their Rails application. Rails Programmer suggests using the `includes` method to reduce N+1 query problems: ```ruby # Before users = User.all users.each do |user| puts user.profile.name end # After users = User.includes(:profile).all users.each do |user| puts user.profile.name end ```

Scenario

This function is crucial for developers looking to optimize their Rails applications, ensuring better performance and scalability.