Raven.AspNetProviders.RavenRoleProvider.DeleteRole C# (CSharp) Method

        public override bool DeleteRole(string roleName, bool throwOnPopulatedRole)
        {
            if (throwOnPopulatedRole && GetUsersInRole(roleName).Length > 0)
            {
                throw new ProviderException("Cannot delete a populated role.");
            }

            _documentStore.DatabaseCommands.UpdateByIndex("Users/ByApplicationNameAndRoleName",
                new IndexQuery{ Query = string.Format("ApplicationName:{0} AND RoleName:{1} ", ApplicationName, roleName) }, 
                new[] 
                {
                    new PatchRequest()
                    {
                        Type = PatchCommandType.Remove,
                        Name = "Roles",
                        Value = roleName
                    }
                });

            using (var session = _documentStore.OpenSession())
            {
                var app = session.Query<Application>().SingleOrDefault(x => x.Name == ApplicationName);
                if (app == null)
                {
                    return false;
                }

                app.Roles.Remove(roleName);
                session.SaveChanges();
            }
            return true;
        }