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Nullable Embeddable Bundle

A Symfony bundle that provides support for nullable Doctrine Embeddables. It allows embeddable objects to become null when all their properties are null, providing a cleaner way to handle optional embedded values.

Installation

Install the bundle using Composer:

The bundle supports:

• PHP 8.1 or higher
• Symfony 6.4 or 7.0 or higher
• Doctrine ORM 2.14 or 3.0 or higher

Usage

1. Create your embeddable class

Create a standard Doctrine embeddable class:

2. Set up the containing entity

First, add the #[ContainsNullableEmbeddable] attribute to your entity. Then, you have two options to make an embeddable property nullable:

Option 1: Using PHP type hints (recommended)

Simply declare the embeddable property with a nullable type hint (? or null type):

Option 2: Using the custom NullableEmbedded attribute

For properties without type hints or when you need to explicitly mark an embeddable as nullable:

You can choose either approach based on your needs. Using PHP type hints is recommended as it provides better type safety and IDE support.

3. Configuration

The bundle will automatically register its Doctrine event subscriber. No additional configuration is required.

How It Works

The bundle uses a Doctrine event subscriber that listens to the postLoad event. When an entity marked with #[ContainsNullableEmbeddable] is loaded, the subscriber checks its embedded properties that either have a nullable type hint or are marked with the #[NullableEmbedded] attribute. If an embeddable property has all its values set to null, the entire embeddable is set to null.

The postLoad event occurs after the entity has been loaded into the current EntityManager from the database or after refresh() has been applied to it.

Example

Features

• Zero configuration required: Just add the attribute(s), set type hints and it works
• Automatically converts empty embeddable objects to null during database loads (instead of keeping objects with all-null properties)
• Fine-grained control: Mark only the properties you want to be nullable
• Works with any Doctrine Embeddable
• Supports both PHP attribute and XML mapping configurations
• Type-safe through PHP 8 features

Troubleshooting

Common Issues

• Embeddable not becoming null:

  • Verify the entity has the #[ContainsNullableEmbeddable] attribute
  • Verify the property has a nullable type (? or null type) or has the #[NullableEmbedded] attribute set
  • Check that all properties in the embeddable are actually null
• Type errors:
  • Ensure your embeddable properties are nullable (?type)
  • Ensure your entity's embeddable property is nullable

Testing

Run the test suite:

Run all checks (CS Fixer, Psalm, and PHPUnit):

License

This bundle is released under the MIT License. See the LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.