[英]Unable to read the value of a document - Firestore
I have a collection which saves totals datewise .我有一个集合节省总计datewise。
Name of collection is scan_total_dtwise
, name of document is company's name, for example Patrol 1
.集合名称为
scan_total_dtwise
,文档名称为公司名称,例如Patrol 1
。 In this document I am setting records datewise, see pic below:在本文档中,我正在按日期设置记录,请参见下图:
If Doc
does not exist, I am able to create it and assign it number 1, using below code:如果
Doc
不存在,我可以使用以下代码创建它并将其分配为 1:
firebase.firestore().collection("scan_total_dtwise").doc(this.splitted_1).set({
[this.show_year_month_date] : 1,
But if it exists, I am not able to update it, because I dont know how to access incDoc.data().4-AUG-2020
.但如果它存在,我无法更新它,因为我不知道如何访问
incDoc.data().4-AUG-2020
。
How do I access console.log(incDoc.data().date_doc_to_update);
我如何访问
console.log(incDoc.data().date_doc_to_update);
as it is coming undefined .因为它即将到来undefined 。 See image below
console.log("Document data:", doc.data());
请参见下图
console.log("Document data:", doc.data());
: :
update_exisiting_serial_total(){
var date_doc_to_update = this.show_year_month_date
var docRef = firebase.firestore().collection('scan_total_dtwise').doc(this.splitted_1);
firebase.firestore().runTransaction(transaction=> {
return transaction.get(docRef).then(incDoc=> {
//if no value exist, assume it as 0 and increase to 1
console.log(incDoc.data().date_doc_to_update);
var newIncId = (incDoc.data().date_doc_to_update || 0) + 1;
transaction.update(docRef, { [this.show_year_month_date]: newIncId });
return newIncId;
...//more code
If you want to access an object property using a variable, you should use JavaScript's bracket notation to index into the object:如果要使用变量访问对象属性,则应使用 JavaScript 的括号表示法来索引对象:
incDoc.data()[date_doc_to_update]
Or to put in more clearly, IMO:或者更清楚地说,IMO:
const data = incDoc.data();
value = data[date_doc_to_update];
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