# Data access control via target object

Through DataControl objects is possible control the access to data  of the logged user for a given object connected to the target. 

For instance if we want to give access only to voyages connected with the business units that the user belong to, a DataControl object like this has to be posted:

```

{
    "matcherTarget": "BusinessUnit",
    "matcherAttributeTarget": "users.key",
    "objectName": "Voyage",
    "attribute": "voyageHeader.businessUnit"
}
```

* **matcherTarget** defines the Dataloy object that has to be used as target object
* **matherAttributeTarget** defines the attribute in the object target that links the object with the user
* **objectName** the Dataloy object that has to be applied the access control
* **attribute** the attribute name that link the  Dataloy object with the target object