Add Operation Service.

src/operations/operation.module.ts

@@ -10,7 +10,8 @@ import { RestangularModule } from 'ngx-restangular';
 
 import { BalanceChartComponent } from './balanceChart.component';
 import { CategoryChartComponent } from './categoryChart.component';
-import { CategoryService } from './category.service'
+import { CategoryService } from './category.service';
+import { OperationService } from './operation.service';
 
 @NgModule({
   imports: [
@@ -22,6 +23,7 @@ import { CategoryService } from './category.service'
   ],
   providers: [
     CategoryService,
+    OperationService,
   ],
   declarations: [
     BalanceChartComponent,

src/operations/operation.service.ts

@@ -0,0 +1,43 @@
+// vim: set tw=80 ts=2 sw=2 sts=2 :
+
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs/Rx';
+
+import { Restangular } from "ngx-restangular";
+
+import { Operation } from './operation';
+
+@Injectable()
+export class OperationService {
+  constructor(
+    private restangular: Restangular
+  ) {}
+
+  private all() {
+    return this.restangular.all('operation');
+  }
+
+  private one(id: number) {
+    return this.restangular.one('operation', id);
+  }
+
+  query(): Observable<Operation[]> {
+    return this.all().getList();
+  }
+  
+  get(id: number): Observable<Operation> {
+    return this.one(id).get();
+  }
+
+  create(operation: Operation): Observable<Operation> {
+    return this.all().post(operation);
+  }
+
+  update(operation: Operation): Observable<Operation> {
+    return this.one(operation.id).post(null, operation);
+  }
+
+  delete(operation: Operation): Observable<Operation> {
+    return this.one(operation.id).delete();
+  }
+}

src/operations/operation.ts

@@ -0,0 +1,9 @@
+// vim: set tw=80 ts=2 sw=2 sts=2:
+
+export class Operation {
+    id: number;
+    operation_date: string;
+    label: string;
+    value: number;
+    category: string;
+}