Question

我想使用Firestore和云功能将用户状态字段更新为值（true）时向用户发送电子邮件。

我的案子：我有一个users（collections），其中有更多的userId（documents）文档，每个文档都包含字段和值。字段之一是状态：true |错误（布尔值）。

如果要使用云功能和sendgrid api将该用户的状态更改为true，我想向该用户发送电子邮件。

users
   - dOpjjsjssdsk2121j131
        - id : dOpjjsjssdsk2121j131
        - status : false
   - pspjjsjssdsdsk2121j131
        - id : pspjjsjssdsdsk2121j131
        - status : false
   - yspjjsjssdsdsk2121j131
        - id : yspjjsjssdsdsk2121j131
        - status : false


const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
const SENDGRID_API_KEY = functions.config().sendgrid.key;
const sgMail = require('@sendgrid/mail');
sgMail.setApiKey(SENDGRID_API_KEY);
exports.sendEmail = functions.firestore.document('users/{userId}')
  .onUpdate((change, context) => {  
   const after = change.after.val();

    if(after.status === 'VERIFIED'){
      console.log('profile verified')
      const db = admin.firestore();

      return db.collection('users').doc(userId)
      .get()
      .then(doc => {
         const user = doc.data();
         const msg = {
           to: 'email',
           from: 'email',
           templateId: 'template id',
           dynamic_template_data: {
            subject: 'Profile verified',
            name: 'name',
        },
       };

       return sgMail.send(msg)
   })
   .then(() => console.log('email sent!') )
   .catch(err => console.log(err) )

    } 

  });

Answer 1

由于在Firestore中没有val()的情况下，您遇到了错误。

尝试将您的change.after.val()更改为change.after.data()，因此您的代码如下所示：

exports.sendEmail = functions.firestore.document('users/{userId}')
  .onUpdate((change, context) => {  
   const after = change.after.data();

    if(after.status === 'VERIFIED'){
      console.log('profile verified')
      const db = admin.firestore();


      return db.collection('users').doc(userId)  // get userId
      .get()
      .then(doc => {
         const user = doc.data();
         const msg = {
           to: 'email',
           from: 'email',
           templateId: 'template id',
           dynamic_template_data: {
            subject: 'Profile verified',
            name: 'name',
        },
       };
       return sgMail.send(msg)
   })
   .then(() => console.log('email sent!') )
   .catch(err => console.log(err) )
    } 
  });

Answer 2

除“ context.params”外，所有答案均对上述答案均正确。 （staffId）

中缺少

当前：

return db.collection('users').doc(userId)  // get userId

应该是：

>     return db.collection('users').doc(context.params.userId)  // get userId

这还将回答以上评论：

how to get the userId before return.db.collection('users').doc(userId) . ? – Fortray Sep 6 '19 at 9:13

Answer 3

you can compare the target field by before and after data, if your target field is not the same. It means the field value has changed.

    const beforedata=change.before.data()
const afterdata=change.after.data()

if(afterdata.status == beforedata.status){
// Status not changed
}else{
//status changed
}

如何在字段值更新时触发Firestore云功能？

3 个答案: