Question

我正在使用来增加值

const increment = firestore.FieldValue.increment(1);

this.fb.afs.collection(colId).doc(docId).set({
  invoiceCount: increment
}, {
  merge: true
})

在继续使用此值后，如何立即检索增加的值？

在同时访问情况下，以下内容是否足够或重要：

this.fb.afs.collection(colId).doc(docId).set({
  count: increment
}, {
  merge: true
})
.finally(() => {
  this.fb.afs.collection(colId).doc(docId).valueChanges().pipe(first()).subscribe(res => {
    //proceed with res.count
  })
})

有什么更好的方法？

Answer 1

更新后，您可以在Firestore文档上调用get，这将获取您刚刚更新的文档：

"dependencies": {
    "nativescript-theme-core": "~1.0.4",
    "nativescript-unit-test-runner": "^0.7.0",
    "tns-core-modules": "~5.3.0"
  },
  "devDependencies": {
    "@types/karma-chai": "0.1.1",
    "@types/mocha": "5.2.6",
    "chai": "4.2.0",
    "karma": "4.3.0",
    "karma-chai": "0.1.0",
    "karma-mocha": "1.3.0",
    "karma-nativescript-launcher": "0.4.0",
    "karma-webpack": "3.0.5",
    "mocha": "6.1.4",
    "nativescript-dev-typescript": "~0.9.0",
    "nativescript-dev-webpack": "~0.21.0"
  }

Firebase增量后获取值

1 个答案: