Implement qualification details (#26)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: #26
Reviewed-by: Constantin Simonis <constantin@simonis.lol>

src/app/services/qualification.service.ts

@@ -2,6 +2,7 @@ import {inject, Injectable} from "@angular/core";
 import {HttpClient} from "@angular/common/http";
 import {map, Observable} from "rxjs";
 import {Qualification} from "../qualification/Qualification";
+import {Employee} from "../employee/Employee";
 
 
 @Injectable({
@@ -14,7 +15,7 @@ export default class QualificationService {
 
   public getAll(): Observable<Qualification[]> {
     return this.http.get<Qualification[]>(`${QualificationService.BASE_URL}/qualifications`).pipe(
-        map(qualifications => qualifications.sort((a, b) => a.id - b.id))
+      map(qualifications => qualifications.sort((a, b) => a.id - b.id))
     )
   }
 
@@ -26,7 +27,14 @@ export default class QualificationService {
     return this.http.put(`${QualificationService.BASE_URL}/qualifications/${id}`, data)
   }
 
-  delete(id: number) {
+  public delete(id: number) {
     return this.http.delete(`${QualificationService.BASE_URL}/qualifications/${id}`)
   }
+
+  public findEmployees(id: number): Observable<Employee[]> {
+    return this.http.get<any>(`${QualificationService.BASE_URL}/qualifications/${id}/employees`)
+      .pipe(
+        map(response => response.employees)
+      );
+  }
 }