+function updateInstanceWithAnother <T extends Model<T>> (instanceToUpdate: Model<T>, baseInstance: Model<T>) {
+ const obj = baseInstance.toJSON()
+
+ for (const key of Object.keys(obj)) {
+ instanceToUpdate[key] = obj[key]
+ }
+}
+
+function resetSequelizeInstance (instance: Model<any>, savedFields: object) {
+ Object.keys(savedFields).forEach(key => {
+ instance[key] = savedFields[key]
+ })
+}
+
+function afterCommitIfTransaction (t: Transaction, fn: Function) {
+ if (t) return t.afterCommit(() => fn())
+
+ return fn()
+}
+
+function deleteNonExistingModels <T extends { hasSameUniqueKeysThan (other: T): boolean } & Model<T>> (
+ fromDatabase: T[],
+ newModels: T[],
+ t: Transaction
+) {
+ return fromDatabase.filter(f => !newModels.find(newModel => newModel.hasSameUniqueKeysThan(f)))
+ .map(f => f.destroy({ transaction: t }))
+}
+