<ion-input *ngIf="property.component == 'number'"
    type="number" [attr.id]="property.id"
    [formControlName]="property.label">
</ion-input>

private createFormGroup = (question: SurveyQuestion) => {

    const formGroup = this.formBuilder.group({
        [question.label]: this.formBuilder.array([])
    });
    const items = formGroup.get(question.label) as FormArray;
    question.properties.forEach((property, index) => {

        let validatorArray = [];

        if (!property.is_optional)
        {
            validatorArray.push(Validators.required);
        }

        //Other validators are added to array here

        items.push(this.formBuilder.group({
            [property.label]: new FormControl("",  Validators.compose(validatorArray))
        }))
    });

    return formGroup;

};