How to Prevent Eloquent from Casting a String Primary Key to 0 in Laravel 5.2?

Laravel 5.2: Using a String as a Custom Primary Key for Eloquent Table

When working with Eloquent models in Laravel 5.2, it is possible to encounter an issue where a custom primary key of type string is cast to 0 when fetching data from the database.

Problem Statement:
A user encountered this issue while using an email as the primary key for a table, resulting in the primary key value becoming 0 after fetching it using the where method.

Solution:
To resolve this issue, it is necessary to inform Laravel that the primary key is not an auto-incrementing integer. This can be achieved by setting both the $incrementing and $primaryKey properties in the model class. Additionally, setting the $keyType property to 'string' is recommended in Laravel 6.0 versions.

Here's an example of how to update the model class:

class UserVerification extends Model
{
    protected $primaryKey = 'verification_token';
    public $incrementing = false;
    protected $keyType = 'string';
}

By making these changes, Laravel will be aware that the primary key is a string and will not attempt to cast it as an integer, resolving the issue where the primary key becomes 0.

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