Smart contract transaction reverted by EVM - asynchronous

Question

I know this question may be better suited for the Ethereum stack exchange but I've gotten no responses over there and I'm wondering if it's more a React issue or something.
I'm trying to run 3 async methods
1: Push a file to IPFS:
pushToIPFS = async(e) => {
return new Promise((resolve, reject) => {
ipfs.add(this.state.buffer, (err, ipfsHash) => {
resolve(ipfsHash[0].hash);
})
});
}
2: Write to smart contract and Blockchain:
addToBlockchain = async(_ipfsLink) => {
return new Promise((resolve, reject) => {
const rand = uniqueRandom(1, 10000000)
var key = rand()
let newDate = new Date()
newDate = newDate.getTime()
var _account = this.state.account[0]
var _uid = this.state.uid
storehash.methods.sendDocument(_ipfsLink, newDate, key, _uid).send({from: _account})
resolve(key)
})
}
3: Add an entry to a firebase database:
createStudent = async(_key) => {
//get student details from state variables & current user uid
var _uid = this.state.uid
var _studentName = this.state.StudentName
var _studentNumber = this.state.StudentNumber
var _courseCode = this.state.CourseCode
var _courseName = this.state.CourseName
var _idForBlockchain = _key
// database.ref.students.uid.studentNumber
const db = firebase.database()
db.ref().child("students").child(_uid).child(_studentNumber).set(
{ studentName: _studentName,
courseCode: _courseCode,
courseName: _courseName,
blockchainKey: _idForBlockchain
}
);
alert("Student added")
}
These are called in that order by this function:
AddMyStuff = async (e) => {
e.preventDefault()
const ipfsHash = await this.pushToIPFS()
//await this.createStudent()
const _key = await this.addToBlockchain(ipfsHash)
await this.createStudent(_key)
}
The problem is the student is being added to the database before the metamask (smart contract) transaction has been confirmed. And also After the smart contract executes, all the correct details are written to the Blockchain, but the following error appears in the console:
web3-core-method.umd.js:1191 Uncaught (in promise) Error: Transaction has been reverted by the EVM: { "transactionHash":
"0xe3f411d872bb5f42bd7bd15676647f5056421c5accb5aa6fa22d75eadd09973a",
"transactionIndex": 0, "blockHash":
"0x749ccd76a6888b261b00d8851dca36545fde563fce4c8513407a180d6cac3a00",
"blockNumber": 6, "from":
"0xa5fcbc63d6bcb8e07750cb75073ec3ff7b98c4f5", "to":
"0xadb13cc1a32b64f938be7c1d3447dfcd20c09ae9", "gasUsed": 175983,
"cumulativeGasUsed": 175983, "contractAddress": null, "logs": [],
"status": true, "logsBloom":
"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"v": "0x2d46", "r":
"0xa1dfe4e9a4ac8dbbdf49186741cd74bda4fed78b280458ed2cd7f979a3020ccd",
"s":
"0x477fa20a2176975f3db9fb1e375fceeedb6ae0e7be35177d4908ad1744dddd1a" }
at SafeSubscriber._next (web3-core-method.umd.js:1191)
at SafeSubscriber.__tryOrUnsub (Subscriber.js:245)
at SafeSubscriber.next (Subscriber.js:174)
at Subscriber._next (Subscriber.js:99)
at Subscriber.next (Subscriber.js:68)
at TransactionObserver.emitNext (web3-core-method.umd.js:510)
at _callee$ (web3-core-method.umd.js:357)
at tryCatch (runtime.js:63)
at Generator.invoke [as _invoke] (runtime.js:282)
at Generator.prototype.(anonymous function) [as next] (http://localhost:3000/static/js/0.chunk.js:276708:21)
at asyncGeneratorStep (asyncToGenerator.js:3)
at _next (asyncToGenerator.js:25)
Scary stuff indeed, does anyone know what could be causing this? Again sorry if this is better suited for Ethereum stack exchange, but I've gotten no responses and I don't know what else to try. Thanks in advance for any help!

Answer 1

in case sendDocument is a promise, you can try that..
addToBlockchain = async (_ipfsLink) => {
const rand = uniqueRandom(1, 10000000)
var key = rand()
let newDate = new Date()
newDate = newDate.getTime()
var _account = this.state.account[0]
var _uid = this.state.uid
await storehash.methods.sendDocument(_ipfsLink, newDate, key, _uid).send({from: _account})
return key
}