Folder structure by domain vs class type

[ollehar]

Two different ways to organize your folders:

• By class type

• By domain

Yii application example uses the first type. I’m thinking the second alternative might put files together in a single folder that have tighter coupling. E.g. PostController has tight coupling with PostEntity, PostRepository, PostDTO, etc, not so much with CommentController.

Second alternative might be better to isolate change.

Thoughts?

Edit: Oh, you actually did this in the Yii example app. Great! yii-demo/src at master · yiisoft/yii-demo · GitHub

[samdark (Alexander Makarov)]

That’s the way to go. The only thing is:

@ollehar

I’m thinking the second alternative might put files together in a single folder that have tighter coupling.

Cohesion, not coupling.

[ollehar]

@samdark

Cohesion, not coupling.

Wait wait. Cohesion is a metric for a single class? And coupling a metric for how two classes interact? Or did I get that wrong?

[samdark (Alexander Makarov)]

Yes, you did. Both metrics are for a module(s) which is multiple classes.

[olleharstedt (Olle Härstedt)]

Well, there are cohesive metric for classes, too. LCOM, for example: Project Metrics Help - Cohesion metrics

[samdark (Alexander Makarov)]

Well, yes. You can measure cohesion of methods as well.