本文介绍了如何使用Firestore填充参考字段的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
您知道如何使用Firestore在文档中填充参考字段吗?
Do you know how I can populate the reference Field on a Document using Firestore?
推荐答案
创建/获取文档引用时,可以将其保存到另一个文档中.此示例用于Node SDK,但应为您提供有关如何在Android上实现此示例的想法.
When you create / get a document reference, you can save this into another document. This example is for the Node SDK, but it should give you an idea of how to implement this for Android.
// Create the references
let myFirstDoc = db.collection('myCollection').doc();
let mySecondDoc = db.collection('otherCollection').doc();
let batch = db.batch();
// Save the two documents to the batch
batch.set(myFirstDoc, {someData: true});
batch.set(mySecondDoc, {firstDocRef: myFirstDoc});
// Commit the batch
return batch.commit()
.then(response => {
console.log('Data saved');
})
.catch(err => {
console.error(err);
});
获取现有参考
return db.collection('myCollection').doc('myDocId')
.then(documentSnapshot => {
let newDoc = db.collection('otherCollection').add({otherDoc: documentSnapshot.ref});
})
.then(response => {
console.log('Data saved');
})
.catch(err => {
console.error(err)
})
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