Firebase Firestore索引和查询返回空结果

数据=>categories集合

[
  {
    "category": "toys and games",
    "factory": 1,
    "link": "action-figure-toys-",
    "name": "action figure toys",
    "type": "subcategory"
  },
  {
    "category": "toys and games",
    "factory": 1,
    "link": "action-figure-toys1",
    "name": "action figure toys1",
    "type": "subcategory"
  },
  {
    "category": "",
    "factory": 1,
    "link": "action-figure-toys-",
    "name": "toys and games",
    "type": "category"
  },

]

索引

质疑

如果我对where子句进行注释，则查询总是返回空结果！ 如果它只有where子句，则返回。

---

where和startAt的组合导致问题

如果删除

startAt

并仅使用

where

，它是否返回结果？如果它仅返回where，则部分是。如果orderby在那里，它不会返回任何东西！

{
  "collectionId": "categories",
  "fields": [
    { "fieldPath": "name", "mode": "ASCENDING" },
    { "fieldPath": "type", "mode": "ASCENDING" },
    { "fieldPath": "factory", "mode": "ASCENDING" },
    { "fieldPath": "category", "mode": "ASCENDING" },
    { "fieldPath": "subCategory", "mode": "ASCENDING" }
  ]
}

this.db
      .collection('categories', ref =>
        ref
          .where('type', '==', 'category')
          .where('factory', '==', 1)
          .orderBy('name')
          .startAt(this.selected)
          .limit(5)
      ).valueChanges();