firestore中的angularfire2事务和批写入

如何在angular2应用程序中使用firestore进行批量写入/运行事务

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如果可能，我如何在angular2应用程序中将JS代码转换为TS代码。

如果您使用的是AngularFirestore，首先您需要确保您的构造函数设置如下：

constructor(private db: AngularFirestore)

现在，您可以使用db.firestore获取firebase.firestore实例

您只需从链接复制代码，并用db.firestore替换db。或者，您可以使用箭头功能使其更美观：

使用事务更新数据：

// Create a reference to the SF doc.
const sfDocRef = db.firestore.collection("cities").doc("SF");

// Uncomment to initialize the doc.
// sfDocRef.set({ population: 0 });

db.firestore.runTransaction(transaction => 
// This code may get re-run multiple times if there are conflicts.
  transaction.get(sfDocRef)
  .then(sfDoc => {
    const newPopulation = sfDoc.data().population + 1;
    transaction.update(sfDocRef, { population: sfDoc.data().population + 1 });
  })).then(() => console.log("Transaction successfully committed!"))
.catch(error => console.log("Transaction failed: ", error));

// Create a reference to the SF doc.
const sfDocRef = db.firestore.collection("cities").doc("SF");

db.firestore.runTransaction(transaction =>
  transaction.get(sfDocRef).then(sfDoc => {
      const newPopulation = sfDoc.data().population + 1;
      if (newPopulation <= 1000000) {
          transaction.update(sfDocRef, { population: newPopulation });
          return newPopulation;
      } else {
          return Promise.reject("Sorry! Population is too big.");
      }
    }))
    .then(newPop => console.log("Population increased to ", newPop)
  ).catch(err => console.error(err));  // This will be an "population is too big" error.

从交易中传递信息：

// Create a reference to the SF doc.
const sfDocRef = db.firestore.collection("cities").doc("SF");

// Uncomment to initialize the doc.
// sfDocRef.set({ population: 0 });

db.firestore.runTransaction(transaction => 
// This code may get re-run multiple times if there are conflicts.
  transaction.get(sfDocRef)
  .then(sfDoc => {
    const newPopulation = sfDoc.data().population + 1;
    transaction.update(sfDocRef, { population: sfDoc.data().population + 1 });
  })).then(() => console.log("Transaction successfully committed!"))
.catch(error => console.log("Transaction failed: ", error));

// Create a reference to the SF doc.
const sfDocRef = db.firestore.collection("cities").doc("SF");

db.firestore.runTransaction(transaction =>
  transaction.get(sfDocRef).then(sfDoc => {
      const newPopulation = sfDoc.data().population + 1;
      if (newPopulation <= 1000000) {
          transaction.update(sfDocRef, { population: newPopulation });
          return newPopulation;
      } else {
          return Promise.reject("Sorry! Population is too big.");
      }
    }))
    .then(newPop => console.log("Population increased to ", newPop)
  ).catch(err => console.error(err));  // This will be an "population is too big" error.

很简单：

constructor(private db: AngularFirestore){}

inserting(){
        //--create batch-- 
        var batch = this.db.firestore.batch();

        //--create a reference-- 
        const userRef = this.db.collection('users').doc('women').ref;
        batch.set(userRef , {
          name: "Maria"
        });

        //--create a reference-- 
        const userRef = this.db.collection('users').doc('men').ref;
        batch.set(userRef , {
          name: "Diego"
        });

        //--Others more 54 batch's--

        //--finally--
        return batch.commit();
    }

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这对我来说非常有效。这也有助于将.ref也放在末尾，或者batch.set抱怨参数是AngularFirestoreDocument而不是DocumentReference。谢谢