save() {
    const data = this.transactionForm.value;
    data.type = data.type == 'true' || data.type == true ? true : false;
    data.updated = firebase.firestore.FieldValue.serverTimestamp();
    // Date string to timestamp
    data.date =  new Date(data.date.split("-").reverse().join("-")).getTime();
    let id = data.id;
    this.transCollection.doc(id).update(data);
}