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Updated Bundles Best Practices for Symfony 4 #8616

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Updated Bundles Best Practices for Symfony 4
javiereguiluz Nov 10, 2017
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javiereguiluz Nov 10, 2017
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javiereguiluz Nov 16, 2017
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104 changes: 62 additions & 42 deletions bundles/best_practices.rst
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Expand Up @@ -4,21 +4,10 @@
Best Practices for Reusable Bundles
===================================

There are two types of bundles:

* Application-specific bundles: only used to build your application;
* Reusable bundles: meant to be shared across many projects.

This article is all about how to structure your **reusable bundles** so that
they're easy to configure and extend. Many of these recommendations do not
apply to application bundles because you'll want to keep those as simple
as possible. For application bundles, just follow the practices shown throughout
the guides.

.. seealso::

The best practices for application-specific bundles are discussed in
:doc:`/best_practices/introduction`.
they're easy to configure and extend. Reusable bundles are those meant to be
shared privately across many company projects or publicly so any Symfony project
can install them.

.. index::
pair: Bundle; Naming conventions
Expand All @@ -28,10 +17,10 @@ the guides.
Bundle Name
-----------

A bundle is also a PHP namespace. The namespace must follow the `PSR-0`_ or
`PSR-4`_ interoperability standards for PHP namespaces and class names: it starts
with a vendor segment, followed by zero or more category segments, and it ends
with the namespace short name, which must end with ``Bundle``.
A bundle is also a PHP namespace. The namespace must follow the `PSR-4`_
interoperability standard for PHP namespaces and class names: it starts with a
vendor segment, followed by zero or more category segments, and it ends with the
namespace short name, which must end with ``Bundle``.

A namespace becomes a bundle as soon as you add a bundle class to it. The
bundle class name must follow these simple rules:
Expand Down Expand Up @@ -116,21 +105,21 @@ The following classes and files have specific emplacements (some are mandatory
and others are just conventions followed by most developers):

=================================================== ========================================
Type Directory
Type Directory
=================================================== ========================================
Commands ``Command/``
Controllers ``Controller/``
Service Container Extensions ``DependencyInjection/``
Commands ``Command/``
Controllers ``Controller/``
Service Container Extensions ``DependencyInjection/``
Doctrine ORM entities (when not using annotations) ``Entity/``
Doctrine ODM documents (when not using annotations) ``Document/``
Event Listeners ``EventListener/``
Configuration ``Resources/config/``
Web Resources (CSS, JS, images) ``Resources/public/``
Translation files ``Resources/translations/``
Event Listeners ``EventListener/``
Configuration (routes, services, etc.) ``Resources/config/``
Web Assets (CSS, JS, images) ``Resources/public/``
Translation files ``Resources/translations/``
Validation (when not using annotations) ``Resources/config/validation/``
Serialization (when not using annotations) ``Resources/config/serialization/``
Templates ``Resources/views/``
Unit and Functional Tests ``Tests/``
Templates ``Resources/views/``
Unit and Functional Tests ``Tests/``
=================================================== ========================================

Classes
Expand Down Expand Up @@ -177,16 +166,26 @@ the ``Tests/`` directory. Tests should follow the following principles:
A test suite must not contain ``AllTests.php`` scripts, but must rely on the
existence of a ``phpunit.xml.dist`` file.

Installation
------------

Bundles should set ``"type": "symfony-bundle"`` in their ``composer.json`` file.
With this, :doc:`Symfony Flex </setup/flex>` will be able to automatically
enable your bundle when it's installed.

If your bundle requires any setup (e.g. configuration, new files, changes to
`.gitignore`, etc), then you should create a `Symfony Flex recipe`_.

Documentation
-------------

All classes and functions must come with full PHPDoc.

Extensive documentation should also be provided in the ``Resources/doc/``
Extensive documentation should also be provided in the ``Resources/doc/``
directory.
The index file (for example ``Resources/doc/index.rst`` or
``Resources/doc/index.md``) is the only mandatory file and must be the entry
point for the documentation. The
The index file (for example ``Resources/doc/index.rst`` or
``Resources/doc/index.md``) is the only mandatory file and must be the entry
point for the documentation. The
:doc:`reStructuredText (rST) </contributing/documentation/format>` is the format
used to render the documentation on symfony.com.

Expand All @@ -203,8 +202,19 @@ following standardized instructions in your ``README.md`` file.
Installation
============

Step 1: Download the Bundle
---------------------------
Applications that use Symfony Flex
----------------------------------

Open a command console, enter your project directory and execute:

```console
$ composer require <package-name>
```

Applications that don't use Symfony Flex
----------------------------------------

### Step 1: Download the Bundle

Open a command console, enter your project directory and execute the
following command to download the latest stable version of this bundle:
Expand All @@ -217,8 +227,7 @@ following standardized instructions in your ``README.md`` file.
in the [installation chapter](https://getcomposer.org/doc/00-intro.md)
of the Composer documentation.

Step 2: Enable the Bundle
-------------------------
### Step 2: Enable the Bundle

Then, enable the bundle by adding it to the list of registered bundles
in the `app/AppKernel.php` file of your project:
Expand Down Expand Up @@ -249,8 +258,20 @@ following standardized instructions in your ``README.md`` file.
Installation
============

Applications that use Symfony Flex
----------------------------------

Open a command console, enter your project directory and execute:

.. code-block:: bash

$ composer require <package-name>

Applications that don't use Symfony Flex
----------------------------------------

Step 1: Download the Bundle
---------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Open a command console, enter your project directory and execute the
following command to download the latest stable version of this bundle:
Expand All @@ -263,7 +284,7 @@ following standardized instructions in your ``README.md`` file.
in the `installation chapter`_ of the Composer documentation.

Step 2: Enable the Bundle
-------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~

Then, enable the bundle by adding it to the list of registered bundles
in the ``app/AppKernel.php`` file of your project:
Expand Down Expand Up @@ -422,9 +443,8 @@ The ``composer.json`` file should include at least the following metadata:
a string (or array of strings) with a `valid license identifier`_, such as ``MIT``.

``autoload``
This information is used by Symfony to load the classes of the bundle. The
`PSR-4`_ autoload standard is recommended for modern bundles, but `PSR-0`_
standard is also supported.
This information is used by Symfony to load the classes of the bundle. It's
recommended to use the `PSR-4`_ autoload standard.

In order to make it easier for developers to find your bundle, register it on
`Packagist`_, the official repository for Composer packages.
Expand All @@ -450,8 +470,8 @@ Learn more
* :doc:`/bundles/extension`
* :doc:`/bundles/configuration`

.. _`PSR-0`: http://www.php-fig.org/psr/psr-0/
.. _`PSR-4`: http://www.php-fig.org/psr/psr-4/
.. _`Symfony Flex recipe`: https://github.com/symfony/recipes
.. _`Semantic Versioning Standard`: http://semver.org/
.. _`Packagist`: https://packagist.org/
.. _`choose any license`: http://choosealicense.com/
Expand Down