Firebase-如何将orderBy添加到复合查询?

假设我的电脑里有一些虚拟数据 users

[
  {email: 'foo@bar.com', claims: {admin: true}}
  {email: 'foo1@bar.com', claims: {admin: true}}
  {email: 'foo2@bar.com', claims: {support: true}}
  {email: 'foo3@bar.com', claims: {support: true}}
  {email: 'foo4@bar.com', claims: {support: true}}
]

我有两个问题:

const admins = this.db.collection('users', (ref) => ref
 .where('claims.admin', '==', true));
const support = this.db.collection('users', (ref) => ref
 .where('claims.support', '==', true));

复合 查询:

this.dataSub = combineLatest(
  admins.valueChanges(),
  support.valueChanges()
)
.pipe(
  map((items) => {
    return [].concat(...items);
  })
)
.subscribe((items) => {
  this.items = items;
});

现在我想补充一下 orderBy 但这到底是怎么回事?放置 订货人 比如:

const admins = this.db.collection('users', (ref) => ref
 .where('claims.admin', '==', true)
 .orderBy('email', 'asc'));
const support = this.db.collection('users', (ref) => ref
 .where('claims.support', '==', true)
 .orderBy('email', 'asc'));

感觉这应该被记录在某个地方,但它只是没有,我怎么能做到这一点?