Laravel eloquent model model attribute casting (Which attribute types should I cast?)
Stefan Izdrail
Founder & Senior Architect · 2026-06-29
Title: Comprehensive Guide on Laravel Eloquent Model Attribute Casting: Which Attributes to Cast?
Introduction: Laravel is well-known for its expressive and elegant syntax. One of the framework's unique features is the Eloquent ORM, which provides a simple and intuitive interface for working with database tables. A lesser-known but equally powerful feature of Eloquent is attribute casting. In this blog post, we will delve into the world of Laravel model attribute casting, discussing what it is, why we should use it, and which types of attributes to cast when developing applications.
What is Attribute Casting?
Attribute casting in Laravel is about transforming data retrieved from database tables before storing or querying it in your application logic. It allows us to define a set of rules for how our model's properties should be handled and manipulated. These rules govern the conversion between different data types, ensuring consistency across our application while making the code cleaner and more maintainable.
Casting Supported Types:
As mentioned in the official documentation (https://laravel.com/docs/8.x/eloquent-mutators#attribute-casting), Laravel supports the following attribute casting types:
1. integer
2. real, float, or double
3. string
4. boolean
5. object
6. array
7. collection
8. date
9. datetime
10. timestamp
11. encrypted
12. encrypted:object (encrypted and wrapped as an object)
13. encrypted:array (encrypted and wrapped as an array)
14. encrypted:collection (encrypted and wrapped as a collection)
Why Use Attribute Casting?
Attribute casting brings several benefits to your application, including:
- Improved consistency: By defining the expected data type in your models, you ensure that all values are handled appropriately throughout your codebase. This makes it easier for future developers to work with and maintain your project.
- Reduced errors and bugs: Attribute casting helps prevent common mistakes due to incorrect data types, such as performing arithmetic operations on strings rather than numbers or trying to sort an array alphabetically because of a string attribute.
- Increased performance: By ensuring that all attribute values are in the correct type, your application can perform faster database queries and optimize memory usage.
When Should I Cast Attributes?
As for when to cast attributes, there are two main approaches: cast only if the field's database type is different from the expected data type or cast always regardless of the database type. Let us explain these strategies in detail:
1. Cast When Database Types Vary: This practice entails casting an attribute when its data type in the database differs from the one you prefer to store it as in your application model. For instance, you might choose to cast a field that stores integers as strings but should be handled as numbers throughout your codebase.
2. Cast Regardless of Database Types: This approach involves casting every attribute in your models, regardless of their database types. While this may seem overly cautious, it ensures consistency across your entire application and minimizes the risk of future errors or bugs due to inconsistent data handling.
Conclusion:
In summary, understanding Laravel Eloquent model attribute casting is a crucial aspect of developing efficient applications. It helps ensure data consistency, reduced errors, better performance, and maintainable code. Although there are various approaches to using attribute casting in your models, the best practice generally involves casting regardless of database types or at least when the field's type varies from the expected one in your application logic. By following these guidelines, you will create robust Laravel applications that will stand the test of time and scale easily as your project grows.