在angular 5 TypeScript中，我想通过数组从firestore中显示图表中的数据，我已成功将数据加载到图表中，但是firestore乱序返回了数组，然后数据错误地到达了图表中。我该怎么办 ？ 仪表板中的代码。ts：
/*an empty arrays*/
public lineChartDataArray = [];
public lineChartData: Array<any> = [
{ data: [this.lineChartDataArray], label: 'כמות לקוחות' }];
public lineChartDateTime: Array<any>;
/*take the days of the month and check if the dates found in firestore*/
async setChartOneMonth(startDate, diffDays) {
var currentDate = this.fromDate;
var days;
for (let i = 0; i <= diffDays - 1; i++) {
currentDate = new Date(currentDate.setDate(startDate.getDate() + i));
days = this.datePipe.transform(currentDate, 'dd/MM/yyyy');
var date = this.datePipe.transform(currentDate, 'yyyy/MM/dd');
this.lineChartDateTime.push(days);
this.clientService.numClientByDate(date).forEach(async data => {
this.lineChartDataArray.push(data.length);
})
}
let result = await this.setChartTable(this.lineChartDataArray);
}
/*axisY by the array that the funstion get*/
setChartTable(lineChartCompletedArray) {
var p = new Promise((resolve, reject) => {
setTimeout(() => {
this.lineChartData = [
{ data: lineChartCompletedArray, label: 'client quantity' }];
}, 1000);
})
return p;`
}
client.service.ts
/*returns the dates in the firestore*/
numClientByDate(createDate) {
return this.afs.collection('Members/' + this.seission.retrieve("user") + '/Clients/', ref => {
// Compose a query using multiple .where() methods
return ref
.where('createDate', '==', createDate)
.orderBy('createDateByDay')
}).valueChanges();
}