sequelize.js: Unhandled rejection SequelizeForeignKeyConstraintError - node.js

Question

I am trying to insert/update data into a postgresql db using the following function:
var updateStudentDataAndReturn = function(req, res, { redirectLink: redirectLink, studentId: studentId }) {
models.Student.update({
firstName: req.body.firstName,
lastName: req.body.lastName,
phoneNumber: req.body.phoneNumber,
skypeUsername: req.body.skypeUsername,
typeOfStudent: req.body.typeOfStudent,
school: req.body.school,
expectedYearOfGraduation: req.body.expectedYearOfGraduation,
TeamId: req.body.TeamId
}, {
where: {
id: studentId
}
}).then(() => {
return models.StudentMajor.destroy({
where: {
StudentId: studentId
}
})
}).then(() => {
return models.StudentSchool.destroy({
where: {
StudentId: studentId
}
})
}).then(() => {
if (!Array.isArray(req.body.major)) {req.body.major = [req.body.major]};
return req.body.major.forEach((major) => {
return models.StudentMajor.create({
StudentId: studentId,
major: major
});
});
}).then(() => {
if (!Array.isArray(req.body.school)) {req.body.school = [req.body.school]};
return req.body.school.forEach((school) => {
return models.StudentSchool.create({
StudentId: studentId,
school: school
});
});
}).then(() => {
return res.redirect(redirectLink);
}).catch((err) => {
console.log('ERROR', err);
});
}
I've already looked at every other similar question I could find, but none of the solutions seem to work. I keep getting the following error.
Executing (default): INSERT INTO "StudentSchools" ("id","school","createdAt","updatedAt","StudentId") VALUES (DEFAULT,'sas','2017-07-22 00:41:49.763 +00:00','2017-07-22 00:41:49.763 +00:00',96) RETURNING *;
Unhandled rejection SequelizeForeignKeyConstraintError: insert or update on table "StudentMajors" violates foreign key constraint "StudentMajors_StudentId_fkey"
at Query.formatError (/Users/Prathmesh/UPennTrackerDB/node_modules/sequelize/lib/dialects/postgres/query.js:296:14)
at Result.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/sequelize/lib/dialects/postgres/query.js:88:19)
at emitOne (events.js:96:13)
at Result.emit (events.js:188:7)
at Result.Query.handleError (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/query.js:163:8)
at Client.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/client.js:188:26)
at emitOne (events.js:96:13)
at Connection.emit (events.js:188:7)
at TLSSocket.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/connection.js:133:12)
at emitOne (events.js:96:13)
at TLSSocket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at TLSSocket.Readable.push (_stream_readable.js:134:10)
at TLSWrap.onread (net.js:543:20)
Executing (default): SELECT "id", "email", "hash", "salt", "role", "createdAt", "updatedAt" FROM "Users" AS "User" WHERE "User"."id" = 96;
Unhandled rejection SequelizeForeignKeyConstraintError: insert or update on table "StudentSchools" violates foreign key constraint "StudentSchools_StudentId_fkey"
at Query.formatError (/Users/Prathmesh/UPennTrackerDB/node_modules/sequelize/lib/dialects/postgres/query.js:296:14)
at Result.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/sequelize/lib/dialects/postgres/query.js:88:19)
at emitOne (events.js:96:13)
at Result.emit (events.js:188:7)
at Result.Query.handleError (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/query.js:163:8)
at Client.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/client.js:188:26)
at emitOne (events.js:96:13)
at Connection.emit (events.js:188:7)
at TLSSocket.<anonymous> (/Users/Prathmesh/UPennTrackerDB/node_modules/pg/lib/connection.js:133:12)
at emitOne (events.js:96:13)
at TLSSocket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at TLSSocket.Readable.push (_stream_readable.js:134:10)
at TLSWrap.onread (net.js:543:20)
Any help would be much appreciated