An array of Promise<Employee> cannot be used as a parameter for an array of type Employee[]

I am currently facing an issue with loading my Collection of Employees from a Firestore Database and fetching a 'Workday' for each Employee, which is stored as a Document in a Subcollection named 'Employees'. Below is the code snippet I am working with:

loadEmployees() {
    return new Promise<Employee[]>(resolve => {
        this.db.collection('Employees').snapshotChanges().pipe(
            map(changes => changes.map(async a => {
                const employee = a.payload.doc.data() as Employee;
                employee.id = a.payload.doc.id;
                employee.workday = await this.loadWorkday(employee);    // <-- returns a Promise<Workday>

                return employee;
            }))
        ).subscribe(
            employees => {
                resolve(employees); // Error: <--- Promise<Employee>[]' is not assignable to parameter of type 'Employee[]
            }
        );
    });
}

However, I am encountering a Syntax Error stating

Promise<Employee>[]' is not assignable to parameter of type 'Employee[]
. I am unsure how to obtain the Employee[] from the Promise<Employee>[] so that I can call the resolve function.

Answer №1

Implement Promise.resolve() in order to elevate your constant/variable employees into a Promise structure.

Prior to executing subscribe(), utilize reduce() to compile your employees into an array of Employee.

If each employee is returned as a Promise, then extract that promise with the help of flatMap() combined with Rx.Observable.from() before applying reduce().

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