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Understanding Design Patterns in Ruby on Rails: A Practical Guide with Examples 🚀

Lakhveer Singh Rajput
CodeX
Published in
6 min readSep 12, 2024

Design patterns are reusable solutions to common problems in software design. They provide a way to structure your code effectively and efficiently. In Ruby on Rails, utilizing these patterns can lead to cleaner, more maintainable code. Let’s explore some of the most commonly used design patterns and see how you can implement them in your Rails applications. 🛠️

1. Singleton Pattern 🦄

What is it?
The Singleton Pattern ensures that a class has only one instance and provides a global point of access to it.

When to use?
Use it when you need exactly one instance of a class and you want to control access to it.

Example in Rails:
Imagine you have a service class that manages configurations and you want to make sure there’s only one instance of this service.

class ConfigurationManager
include Singleton

def initialize
@configurations = {}
end

def set(key, value)
@configurations[key] = value
end

def get(key)
@configurations[key]
end
end

# Usage
config_manager = ConfigurationManager.instance
config_manager.set(:api_key, '12345')
puts config_manager.get(:api_key) # Output: 12345
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Lakhveer Singh Rajput
Lakhveer Singh Rajput

Written by Lakhveer Singh Rajput

Ruby on Rails enthusiast, book lover and DevOps explorer. Follow me for insights on coding, book recommendations, and bridging development with operations.🚀📚

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