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Can not add role for a user in case g = _, _, _

See original GitHub issue

I have the following role definition:

[role_definition]
g = _, _, _

But, when I am trying to add a role for a user, the function addRoleForUser accepts only two parameters (it is hardcoded), so I can not provide the domain.

Here is the test-case I wrote to check that:

    it('Should properly add new role to user and remove it from the enforcer', async () => {
        const enforcer = await getEnforcer();

        assert.deepEqual(await enforcer.getGroupingPolicy(), []);
        // here I am trying to add role, but signature for the method accepts only user and role
        assert.isTrue(await enforcer.addRoleForUser('subject', 'role', 'domain'));
    });

So, as a result, I am getting the following error:

Error: grouping policy elements do not meet role definition
      at Assertion.buildRoleLinks (node_modules/casbin/lib/model/assertion.js:40:23)
      at astMap.forEach.value (node_modules/casbin/lib/model/model.js:123:19)
      at Map.forEach (<anonymous>)
      at Model.buildRoleLinks (node_modules/casbin/lib/model/model.js:122:16)
      at Enforcer.buildRoleLinks (node_modules/casbin/lib/coreEnforcer.js:246:20)
      at Enforcer.<anonymous> (node_modules/casbin/lib/managementEnforcer.js:339:22)
      at Generator.next (<anonymous>)
      at fulfilled (node_modules/casbin/lib/managementEnforcer.js:17:58)