Как сохранить динамические данные в массиве и разместить их в базе данных с помощью API в ionic 3

Question

Я отображаю список сведений о студентах из базы данных на основе выбранной категории.Мне нужно хранить эти данные в массиве и многократно хранить все данные (все данные о студентах) в базе данных.

home.html

<ion-list>
    <!-- Select Stream  -->
    <ion-item>
        <ion-label>Stream:</ion-label>
        <ion-select [(ngModel)]="streamId" (ionChange)="selectedStream(id)" class="optionsStyle" placeholder="Select Stream">
            <ion-option *ngFor="let list of getListStream" value="{{list.Stream_Id}}">{{list.Stream_Name}}</ion-option>
        </ion-select>
    </ion-item>

    <!-- Select Medium -->
    <ion-item>
        <ion-label>Medium:</ion-label>
        <ion-select [(ngModel)]="mediumId" (ionChange)="selectedMedium(id)" class="optionsStyle" placeholder="Select">
            <ion-option *ngFor="let list of getListMedium" value="{{list.Medium_Id}}">{{list.Medium_Name}}</ion-option>
        </ion-select>
    </ion-item>

    <!-- Select Standard -->
    <ion-item>
        <ion-label>Standard:</ion-label>
        <ion-select [(ngModel)]="standardId" (ionChange)="selectedStandard(id)" class="optionsStyle" placeholder="Select">
            <ion-option *ngFor="let list of getListStandard" value="{{list.Standard_Id}}">{{list.Standard_Name}}</ion-option>
        </ion-select>
    </ion-item>

    <ion-item>
        <ion-label>Section:</ion-label>
        <ion-select [(ngModel)]="sectionId" (ionChange)="selectedSection(id)" class="optionsStyle" placeholder="Select">
            <ion-option *ngFor="let list of getListSection" value="{{list.Section_Id}}">{{list.Section_Name}}</ion-option>
        </ion-select>
    </ion-item>


        <ion-item *ngFor="let list of getStudentList">
            <ion-label>{{list.Student_FirstName}}</ion-label>
            <ion-toggle [(ngModel)]="list.Student_LastName" (ionChange)="changeToggle(list)"></ion-toggle>
        </ion-item>

        <button ion-button full *ngIf="getStudentList" (click)="sendAttendanceStstus(getStudentList)">Submit</button>

</ion-list>

home.ts

constructor
(
    public nvCtrl: NavController,
    private restAttendance: RestAttendanceProvider,
    public alertCtrl: AlertController
) { }

ionViewDidEnter() {
    this.restAttendance.getStudentAttendanceStreamDetails()
        .then(data => {
            this.getListStream = data;
            console.log(this.getListStream);
        });
}


//Stream Id
selectedStream(id) {
    console.log(this.streamId);

    id = this.streamId;

    this.restAttendance.getStudentAttendanceMediumDetails(this.streamId)
        .then(data => {
            this.getListMedium = data;
            console.log(this.getListMedium);
        });
}

//MediumId
selectedMedium(id) {
    console.log(this.streamId + this.mediumId);

    id = this.mediumId;

    this.restAttendance.getStudentAttendanceStandardDetails(this.streamId, this.mediumId)
        .then(data => {
            this.getListStandard = data;
            console.log(this.getListStandard);
        });
}

//StandardId
selectedStandard(id) {
    console.log(this.standardId);

    id = this.standardId;

    this.restAttendance.getStudentAttendanceSectionDetails(this.streamId, this.mediumId, this.standardId)
        .then(data => {
            this.getListSection = data;
            console.log(this.getListSection);
        });
}

//SectionId
selectedSection(id) {
    console.log(this.sectionId);

    id = this.sectionId;

    this.restAttendance.getStudentAttendanceList(this.streamId, this.mediumId, this.standardId, this.sectionId)
        .then(data => {
            this.getStudentList = data;
            console.log(this.getStudentList);
        });
}

changeToggle(list) {
    console.log(list.Student_Id + list.Student_LastName);
}

sendAttendanceStstus(getStudentList) {

    if (!this.streamId || !this.mediumId || !this.standardId || !this.sectionId) {
        let alert = this.alertCtrl.create({
            title: "Select",
            subTitle: "please select all details",
            buttons: ['ok']
        }).present();
        console.log("Select details");
    } else {
        console.log('StreamId: '+ this.streamId + ' mediumId: ' + this.mediumId + ' StandardId: ' + this.standardId + ' SectionId: ' + this.sectionId + ' '+getStudentList);
        // this.restAttendance.postStudentAttendanceDetails(this.streamId, this.mediumId, this.standardId, this.sectionId, this.studentId, this.Student_Name)
        //     .then(data => {
        //         console.log(data);
        //         this.nvCtrl.push(DashboardPage);
        //     }).catch(err => {
        //         console.log(err);
        //     });
    }

}

поставщик

    getStudentAttendanceList(streamId, mediumId, standardId, sectionId) {
    return new Promise(resolve => {
      this.http.get(this.apiStudentList+'?StreamId='+streamId+'&MediumId='+mediumId+'&StandardId='+standardId+'&SectionId='+sectionId).subscribe(data => {
        resolve(data);
        console.log(data);
      }, err => {
        console.log(err);
      });
    });
  }

    postStudentAttendanceDetails(streamId, mediumId, standardId, sectionId, id, name) {
    return new Promise(resolve => {
      this.http.post('http://localhost:49379/api/Attendance/PostStudentAttendance', {

        "Student_Id": id,
        "Student_Name": name,
        "Attendance_Status": 1,
        "section_Id": '10',
        "Date": 15/10/2018
      }).subscribe(data => {
        resolve(data);
      }, err => {
        console.log(err);
      });
    });

Мне нужно, чтобы каждое значение переключателя в отношении идентификатора студента сохранялось в переменной и отправлялось в базу данных каждого студента в списке.