Customer Community Plus User Cannot Add Other User

Explanation

Take a look at sObjects That Cannot Be Used Together in DML Operations. It is not your call to UserInfo.getUserRoleId() that is causing the error. You get the error because you are setting the UserRoleId field to a non-null value.

Based on the below, you could in theory write a class that can insert a User with a UserRoleId if you set the API Version to 14.0 or below. I wouldn't recommend it, however, as there are certainly better workarounds.

• Don't specify UserRoleId or specify it as null
• Setting the UserRoleId in a trigger or @future method might work.

Example

Any code sample along these lines will pass:

insert new User(
    // required fields
    UserRoleId = null
);
insert anotherRecord;

API Version 15.0 +

Insert

You can insert a user in a transaction with other sObjects in Apex code saved using Salesforce API version 15.0 and later if UserRoleId is specified as null.

Update

You can update a user in a transaction with other sObjects in Apex code saved using Salesforce API version 15.0 and later if the following fields are not also updated:

• UserRoleId
• IsActive
• ForecastEnabled
• IsPortalEnabled
• Username
• ProfileId

Prior Versions

Insert

You can insert a user in a transaction with other sObjects in Apex code saved using Salesforce API version 14.0 and earlier.

Update

You can update a user in a transaction with other sObjects in Apex code saved using Salesforce API version 14.0 and earlier.