How to dynamic handle roles|permissions in Symfony2 at database level: CRUD operations over them

[reyn...@gmail.com]

I am working in a Symfony 2.8 project and I have a doubt regarding users/groups/roles|permissions. There are a few ways to handle users and groups as for example [SonataUser][1] on top of [SonataAdmin][2] and lately [EasyAdmin][3] but all of them lacks ROLE|permissions management and this is exactly my doubt: what's the proper way to handle them? Yes, I know I need to write them at `security.yml` but I don't know if I can store then in DB (somewhere) and then read from there. I have research about this and found ACL, Voters and so on but instead of clear my mind the research is confusing me a lot so I need some push from people here. Then:

 - How would you handle this?

 - Any example at code level? (I prefer to see something other than words to get the whole point)

 - Are ROLES sames as permissions?

**Update: improve question**

What I want to have is a `ManyToMany` relationship between `users` and `roles` and possibly `groups` and `roles`. I think that as `SonataUserBundle` handle this is by creating a column `roles` in `user` table and assign a lot of roles to each user, even create new ones if I'm not mistaken but what about if I want to create as much roles as I can without assign them to a user and later add many roles to a user even to a group? 

How would you do that?

 [1]: https://github.com/sonata-project/SonataUserBundle

 [2]: https://github.com/sonata-project/SonataAdminBundle

 [3]: https://github.com/javiereguiluz/EasyAdminBundle

This comes from here: http://stackoverflow.com/questions/34184630/how-to-dynamic-handle-rolespermissions-in-symfony2-at-database-level-crud-oper/