I am trying to query on rally api by using below 

```
req.Query = new Query("User.ObjectID", Query.Operator.Equals, loggedinUser.ToString()).And(new Query("Role", Query.Operator.Contains, Role).And(new Query("Workspace.ObjectID", Query.Operator.Contains, workspaceID)).And(new Query("Project.ObjectID", Query.Operator.Equals, projectObjectID)));

```

But it is throwing error as 

```
The operator [ contains ] is not supported for this attribute type. The available operators are [ =, !=, >, <, >=, <=, in ]

```

is it contains key word is deprecated? please help me alternative in such case.