Product Group renamed to Menu Category

Extracted Product Group -> Group_type to a a new object called Sale Category.
Moved tax from product to Sale Category for uniform taxes on types of sales.

bookie/src/app/sale-category/sale-category.service.ts

@@ -0,0 +1,72 @@
+import {Injectable} from '@angular/core';
+import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
+import {ErrorLoggerService} from '../core/error-logger.service';
+import {catchError} from 'rxjs/operators';
+import {Observable} from 'rxjs/internal/Observable';
+import {SaleCategory} from '../core/sale-category';
+
+const httpOptions = {
+  headers: new HttpHeaders({'Content-Type': 'application/json'})
+};
+const url = '/v1/sale-categories';
+const serviceName = 'SaleCategoryService';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class SaleCategoryService {
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {
+  }
+
+  get(id: string): Observable<SaleCategory> {
+    const getUrl: string = (id === null) ? `${url}/new` : `${url}/${id}`;
+    return <Observable<SaleCategory>>this.http.get<SaleCategory>(getUrl)
+      .pipe(
+        catchError(this.log.handleError(serviceName, `get id=${id}`))
+      );
+  }
+
+  list(): Observable<SaleCategory[]> {
+    const options = {params: new HttpParams().set('l', '')};
+    return <Observable<SaleCategory[]>>this.http.get<SaleCategory[]>(url, options)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'list'))
+      );
+  }
+
+  save(saleCategory: SaleCategory): Observable<SaleCategory> {
+    return <Observable<SaleCategory>>this.http.post<SaleCategory>(`${url}/new`, saleCategory, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'save'))
+      );
+  }
+
+  update(saleCategory: SaleCategory): Observable<SaleCategory> {
+    return <Observable<SaleCategory>>this.http.put<SaleCategory>(`${url}/${saleCategory.id}`, saleCategory, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'update'))
+      );
+  }
+
+  updateSortOrder(list: SaleCategory[]): Observable<boolean> {
+    return <Observable<boolean>>this.http.post<SaleCategory[]>(url, list, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'updateSortOrder'))
+      );
+  }
+
+  saveOrUpdate(saleCategory: SaleCategory): Observable<SaleCategory> {
+    if (!saleCategory.id) {
+      return this.save(saleCategory);
+    } else {
+      return this.update(saleCategory);
+    }
+  }
+
+  delete(id: string): Observable<SaleCategory> {
+    return <Observable<SaleCategory>>this.http.delete<SaleCategory>(`${url}/${id}`, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'delete'))
+      );
+  }
+}