Why Open struct for dynamic objects in Ruby? - Purpose & Use Cases

The Big Idea

What if you could create objects that change shape as easily as you change your mind?

The Scenario

Imagine you need to store information about different things, like a person, a book, or a car, but each has different details. Writing a class for each one takes a lot of time and effort.

The Problem

Manually creating many classes or hashes for each type is slow and confusing. You might forget to add a detail or make mistakes when accessing data, causing bugs and frustration.

The Solution

OpenStruct lets you create flexible objects on the fly. You can add any properties you want without predefining a class. It makes your code cleaner and easier to change.

Before vs After

✗ Before

person = {name: 'Alice', age: 30}
puts person[:name]

✓ After

require 'ostruct'
person = OpenStruct.new(name: 'Alice', age: 30)
puts person.name

What It Enables

It enables you to build simple, adaptable objects quickly, making your programs more flexible and easier to maintain.

Real Life Example

When working with data from a web API that returns different fields for each item, OpenStruct lets you handle this data smoothly without writing many classes.

Key Takeaways

Manually defining many classes is slow and error-prone.

OpenStruct creates flexible objects with dynamic properties.

This makes your code simpler and more adaptable.