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always print # Design Patterns in the Project

# Design Patterns in the Project

## SOLID Principles
- **S**ingle Responsibility: Each class should have a single responsibility.
- **O**pen/Closed: Classes should be open for extension, closed for modification.
- **L**iskov Substitution: Subclasses must be interchangeable with their base classes.
- **I**nterface Segregation: Avoid interfaces with unnecessary methods.
- **D**ependency Inversion: Dependencies should be based on abstractions.

## Use of Design Patterns
- **Service Objects**: To encapsulate business logic in separate classes.
- **Repository Pattern**: To handle data access.
- **Factory Pattern**: For creating complex objects.
- **Command Pattern**: For operations that need to be reversible.

## Example of a Service Object
```ruby
class ProcessPaymentService
  def initialize(user, order)
    @user = user
    @order = order
  end

  def call
    process_payment
    notify_user
  end

  private

  def process_payment
    PaymentGateway.charge(@user, @order.total_price)
  end

  def notify_user
    NotificationService.send_email(@user, "Payment processed successfully.")
  end
end
```
```