Cloud functions Trigger

clodfunctions.js

'use strict';

const functions = require('firebase-functions');


const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.addLoanReq = functions.firestore
  .document('loans/{documentId}')
  .onCreate(event => {

	var loanInfo = event.data.data();
	var loanType = loanInfo.loanType;
	var loanAmt = loanInfo.loanAmt;
	var recUserId = loanInfo.userId;
        console.log(`loan amout ${loanAmt}`);
        console.log(`user id ${recUserId}`);

	var loansRef = admin.firestore().collection('loans')

	var loanReqCount;
	loansRef.where('userId', '==', recUserId).get()
    		.then(snapshot => {
		  loanReqCount = snapshot.size;
		  console.log(`no of loan requests ${snapshot.size}`);
    	})
    	.catch(err => {
           console.log('Error getting total request loans', err);
       });

	var statusVal;
	if (loanReqCount > 6){
	  statusVal = 'Loan is rejected due to limit on no of loans';
	}else if(loanAmt < 100000 && loanReqCount < 3){
	   statusVal = 'Loan is accepted for further processing';
	}else if(loanAmt < 50000 && loanReqCount < 4){
	   statusVal = 'Loan is approved, loan office will contact you';
	}else if(loanAmt < 20000 && loanReqCount < 2 && loanType == 'auto'){
	   statusVal = 'Ready to issue disbursment check to auto retailer';
	}else{
	   statusVal = 'Contact loan office at your nearest branch';
	}

        return event.data.ref.set({status: statusVal}, {merge: true});
});
exports.updateLoanReq = functions.firestore
  .document('loans/{documentId}')
  .onUpdate(event => {

	var loanInfo = event.data.data();
	var loanType = loanInfo.loanType;
	var loanAmt = loanInfo.loanAmt;

 	var prevLoanInfo = event.data.previous.data();
	var prevLoanType = prevLoanInfo.loanType;
	var prevLoanAmt = prevLoanInfo.loanAmt;
	console.log(`prev loan amout ${prevLoanAmt}`);
	var prevStatus = prevLoanInfo.status;
	console.log(`prev loan status ${prevStatus}`);
	if ( typeof prevStatus == 'undefined')
	{
  		return;
	}
	var statusVal;

	if(prevStatus.indexOf('rejected') > -1) {
	     statusVal = 'Manual review';
	}else {
	 if (prevLoanAmt > loanAmt){
	  statusVal = 'Loan is accepted for further processing';
	 }else if(prevLoanType == loanType && prevLoanAmt < loanAmt){
	   statusVal = prevStatus;
	 }else{
	   statusVal = 'Contact loan office at your nearest branch';
	 }
	}
        return event.data.ref.set({status: statusVal}, {merge: true});
});
exports.deleteLoanReq = functions.firestore
  .document('loans/{documentId}')
  .onDelete(event => {

        var loanInfo = event.data.previous.data();
	var loanTypeDel = loanInfo.loanType;
	var loanAmtDel = loanInfo.loanAmt;
	var recUserIdDel = loanInfo.userId;

	var addDoc = admin.firestore().collection('loansHistory').add({
        loanType: loanTypeDel,
        loanAmt: loanAmtDel,
	userId: recUserIdDel
        }).then(ref => {
          console.log('Added loan info to history table ', ref.id);
       });

      return addDoc.then(res => {
        console.log('Add: ', res);
      });
});

transactions.ts

import { FirebaseApp } from 'angularfire2';
//...
export class QuestionComponent implements OnInit {
  questionRef;

  constructor(private fb: FirebaseApp) {}
  ngOnInit() {
    this.questionRef = this.fb.firestore().collection('questions').doc(this.id);
  }

  voteYes() {
    this.fb.firestore().runTransaction(transaction => {
      return transaction.get(this.questionRef).then(question => {
        const newVotes = question.data().yesVotes + 1;
        transaction.update(this.questionRef, { yesVotes: newVotes });
      });
    });
  }