Structure of object fetched to firebase from GAS Google sheet - firebase

Question

I have script tied to Google sheet that collects data from 3 columns (date, userID, value) on the sheet and pass them to object that is then fetched to Firebase DB.
The script correctly push the object into Firebase but I have troubles to achieve structure of data object that I need (so the nodes are correctly structured in Firebase). In the “date” column in the sheet I have date under which I want to group userID:value pair but when I iterate over rows in the sheet it only stores last userID:value pair with given date and not all.
My code:
function writeValues() {
// Database reference
const databaseURL = "https://sampledatabaseURL.firebaseio.com/"
const token = ScriptApp.getOAuthToken();
// Get spreadsheet, range of data and all values within
var spreadSheet = SpreadsheetApp.getActiveSpreadsheet();
var sheet = spreadSheet.getSheetByName("test");
const range = sheet.getDataRange();
const allValues = range.getValues();
// Get indexes for headers in columns
const headers = {};
allValues[0].forEach(function (value, index) {
headers[value] = index
});
const dbData = {};
allValues.forEach(function (row, index) {
if (index === 0) { return } // skip header row
dbData[row[headers.date]] = {
[row[headers.userID]] : row[headers.value]
}
})
const url = databaseURL + "/test.json?access_token=" + encodeURIComponent(token)
const response = UrlFetchApp.fetch(url, {
method: 'put',
payload: JSON.stringify(dbData)
})
Logger.log(response.getResponseCode());
}
Output JSON file it produces and that’s fetched to Firebase:
{
"20180118" : {"userID2" : "value2"},
"20200705" : {"userID4" : "value4"},
"20210324" : {"userID6" : "value6"}
}
Desired output structure:
{
"20180118" : {"userID1" : "value1", "userID2" : "value2"},
"20200705" : {"userID3" : "value3", "userID4" : "value4"},
"20210324" : {"userID5" : "value5", "userID6" : "value6"}
}

Answer 1

I believe your goal as follows.
You want to achieve the following situation.
From: This image is from your question.
To: You want to retrieve the following output as the value of dbData.
{
"20180118" : {"userID1" : "value1", "userID2" : "value2"},
"20200705" : {"userID3" : "value3", "userID4" : "value4"},
"20210324" : {"userID5" : "value5", "userID6" : "value6"}
}
In this case, how about the following modidfication? When your script is modified, it becomes as follows.
From:
const allValues = range.getValues();
// Get indexes for headers in columns
const headers = {};
allValues[0].forEach(function (value, index) {
headers[value] = index
});
const dbData = {};
allValues.forEach(function (row, index) {
if (index === 0) { return } // skip header row
dbData[row[headers.date]] = {
[row[headers.userID]] : row[headers.value]
}
})
To:
const [, ...values] = range.getValues();
const dbData = values.reduce((o, [a,b,c]) => {
if (!o[a]) o[a] = {};
o[a][b] = c;
return o;
}, {});
console.log(dbData)
When above modified script is run for your sample Spreadsheet, the value of dbData is the output you expect.
Reference:
reduce()