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shiprocket_devs's avatar

Laravel Query time casting for variables

Hi there, we have certain tables where the column type is a string but sometimes devs miss that and use a variable that might have an int type. This results in a heavy query time as the index doesn't work. Instead of every time using (string) casting, is there a way to by default change the casting to string whenever that specific column is used in any query?

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8 replies
LaryAI's avatar
Level 58

One possible solution to this problem is to use Laravel's Eloquent model events. Specifically, you can use the booted method to automatically cast the specific column to a string whenever it is used in any query.

Here's an example of how you can implement this solution:

use Illuminate\Database\Eloquent\Model;

class YourModel extends Model
{
    protected $casts = [
        'your_column' => 'string',
    ];

    protected static function booted()
    {
        static::retrieved(function ($model) {
            $model->your_column = (string) $model->your_column;
        });
    }
}

In this example, replace YourModel with the name of your actual model class, and your_column with the name of the specific column you want to cast to a string.

The $casts property is used to define the casting rules for your model's attributes. By adding 'your_column' => 'string' to the $casts array, Laravel will automatically cast the your_column attribute to a string whenever it is accessed.

The booted method is a static method that is called when the model is booted. In this method, we use the retrieved event to listen for when a model is retrieved from the database. When this event is fired, we cast the your_column attribute to a string by explicitly casting it using (string).

With this solution in place, whenever you use the your_column attribute in any query, it will be automatically cast to a string, ensuring that the index works correctly and improving query performance.

vincent15000's avatar

The casting is only available as a getter.

As I understand your question, you need to cast the content when the user types it in a field ?

krisi_gjika's avatar

you mean when ->where('field', $value) if field and value are not the same type, the DB engine will have to cast the field and therefore not use an available index of field?

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shiprocket_devs's avatar

@krisi_gjika Yes I mean that. I don't want everyone to keep adding casting before the variable. Maybe handle it at the model level

krisi_gjika's avatar

@shiprocket_devs since the model delegates these functions to the query builder, you would have to overwrite that. Overwrite the newEloquentBuilder method on the model with your own builder that extends Eloquent builder. Although I would be interested to hear your use case. Where your values are not already casted?

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