查询GraphQL中的agregate计数

Question

我在用户和电影之间有一个n：m关联

const UserMovie = db.define('user_movie', {
  state: {
  type: Sequelize.BOOLEAN,
  allowNull: false,
  },
});    

User.belongsToMany(Movie, { through: UserMovie });
Movie.belongsToMany(User, { through: UserMovie });

我想查询UserMovie按电影获取用户组的计数，其中state为“true”。所以我写道：

user_movie: {
    type: new GraphQLList(UserMovie),
    args: {
      offset: {
        type: GraphQLInt
      },
      limit: {
        type: GraphQLInt
      },
      users: {
        type: new GraphQLList(GraphQLInt)
      }
    },
    resolve (root, args) {
      return db.models.user_movie.findAll({
        offset: args.offset,
        limit: args.limit,
        where: {
          state: true,
          userId: [args.users]
        },
        attributes: ['movieId', [sequelize.fn('COUNT', sequelize.col('userId')), 'usercount']],
        group: 'movieId',
      });
    }
  },

但每次我查询它时，都会返回一个usercount null

感谢您的帮助。