Just created hgraca/doctrine-test-db-regeneration-bundle

While working on the next post of The Software Architecture Chronicles I ended up creating a little symfony bundle which I called hgraca/doctrine-test-db-regeneration-bundle to generate and regenerate the tests database used by a phpunit tests suite.

It is inspired by some code that Luis Cobucci wrote back in 2017, and it uses the Doctrine fixtures to generate a backup of the tests DB, which is then put in place just before every test method and removed just after every test method.

It has 3 options:

  1. We can opt to use an existing tests DB backup, if it is available. This saves us the time to generate the DB, but it will not be useful if we want to test queries that are based on time like “select all users created in the last hour” because if the backup is older than 1h our tests will fail;
  2. We can opt to not put in place a new copy of the DB at the beginning of a test method, so that we can safely use the DAMA\DoctrineTestBundle together with this bundle;
  3. We can opt to not remove the DB at the end of a test method, so that we can safely use the DAMA\DoctrineTestBundle together with this bundle.

You can check out the bundle here: hgraca/doctrine-test-db-regeneration-bundle

Hope it’s useful for more people and constructive feedback is always welcome.

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When to use events

Typically, in a layered architecture, the top layers are aware of the lower layers and start logic in the lower layers. But, the lower layers are not aware of the layers above and can not start logic in the layers above. However, in highly complex situations, the lower layers might need to fire logic in the top layers.

Continue reading “When to use events”

About class naming over-simplification

Naming a class as ProductProperties, instead of simply Properties despite the namespace refer it to be in the Product namespace, does NOT defeat the purpose of the namespaces.

Namespaces are supposed to prevent clashes in class naming, to prevent ambiguity at a auto-loading level. They do not prevent ambiguity at a development level.

If at development I see a class named Properties, I will assume it to be Properties. Would any dev go look at the top of the file for the “use bladibla” to make sure about what class it is? I dont think so. However, that Properties class might actually be the ProductProperties, or the CategoryProperties, or something else. So a class name should be as accurate and unambiguous as possible, independently of the namespace.

Bottom line: If its a Properties class, name it Properties, but if it is a ProductProperties class, name it ProductProperties!

Creating relationships between entities with Symfony2, Doctrine and yml

So I’m starting a new project now, I’ve set up the logger, I’ve set up the mailing, and now it’s time I start to set up the model layer with Doctrine. In Symfony2 you can choose to have the configuration of this layer in xml files, yml files or as annotations directly in the entities classes. Personaly I find xml files too verbose, and annotations put logic in the entities which makes them less readable and if we want to change ORM we will have Doctrine configurations in entities that do not deal with Doctrine, so I prefer to have the configurations in yml files. Symfony has some documentation on how to set this up, but its not complete, as far as I can remember it only has documentation about one to many relationships, but in real life situations we rarely find only those types of relationships in a DB schema, so here I will document how to configure one to one, one to many, many to many and many to many to many relationships.

Continue reading “Creating relationships between entities with Symfony2, Doctrine and yml”