docker-compose doesn't persist data using volumes

[iskyd]

Hi, I have set up two containers db and web app and now i'm trying to run it using docker-compose.
This is my docker-compose.yml

db:
    image: mysql:latest
    ports:
    - "3309:3306"
    volumes:
        - /home/mattia/docker/data/mysql
magento:
    image: eone/magento
    ports:
        - "8001:80"
    links:
        - db
    command:
        bash -c "/sbin/virtualhost.sh create magento.docker /var/www/magento && /sbin/magento-setup.sh && apache2ctl -DFOREGROUND"
    volumes:
        - /home/mattia/docker/data/magento

I omitted all env vars for better reading.
The containers starts and works right, but i have a problem with data-persist.
I created a two folders /home/mattia/docker/data/magento /home/mattia/docker/data/mysql and give them 777 permission.
Now i try to create some db or apply some modify to web app but neither containers persist data on volumes.
If i for example inspect mysql container i get :

"Volumes": {
            "/home/mattia/docker/data/mysql": {},
            "/var/lib/mysql": {}
        },

If i run the containers using docker run and specify -v /home/mattia/docker/data/path the containers seems to persist data correctly.
So where i'm wrong?
Thanks in advance.

[iskyd]

Okay i think that the problem is that i have to specify also the path on the container.
So for example :

volumes:
        - /home/mattia/docker/data/mysql:/var/lib/mysql