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How do you implement custom validation logic in SilverStripe?

How do you implement custom validation logic in SilverStripe?

To implement custom validation logic in SilverStripe, follow these steps:

Step 1: Create a Custom Validation Method

  • In your DataObject class, define a custom validation method. This method should return a boolean indicating the validity of the object and add validation errors to the ValidationResult if necessary.

Example

<?php
use SilverStripe\ORM\DataObject;
use SilverStripe\Core\Validation\ValidationResult;

class MyDataObject extends DataObject
{
    private static $db = [
        'Name' => 'Varchar',
    ];

    public function validate()
    {
        $result = ValidationResult::create();

        if (empty($this->Name)) {
            $result->addError('Name cannot be empty', 'Name');
        }

        return $result;
    }
}
?>

Step 2: Call the Custom Validation Method

  • The validate method is automatically called during the saving process. You don’t need to call it manually; SilverStripe will invoke it for you when the object is saved.

Step 3: Use the DataObject in Forms

  • When you use this DataObject in a form, the validation messages will be automatically displayed if validation fails.

Example

<?php
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\TextField;
use SilverStripe\Forms\SubmitButton;

class MyDataObjectController extends PageController
{
    public function MyForm()
    {
        $form = new Form(
            $this,
            'MyForm',
            FieldList::create(
                TextField::create('Name', 'Enter your name')
            ),
            FieldList::create(
                SubmitButton::create('Submit')
            )
        );

        return $form;
    }
}
?>

Step 4: Handle Validation Errors

  • If validation fails, the errors will automatically be displayed in the form. You can customize how errors are displayed in the template if needed.

Step 5: Test the Implementation

  • Create or edit a record using the form and test the validation logic by submitting the form with invalid data.

By following these steps, you can implement custom validation logic for your DataObject in SilverStripe effectively.

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