add mutation

src/app/data/services/IChangeMerchantNameCommand.ts

@@ -0,0 +1,4 @@
+export interface IChangeMerchantNameCommand {
+  merchantId: string;
+  newName: string;
+}

src/app/data/services/IMerchant.ts

@@ -0,0 +1,5 @@
+export interface IMerchant {
+  id: string;
+  name: string;
+  address: string;
+}

src/app/data/services/merchant.service.ts

@@ -1,36 +1,63 @@
 import { Injectable } from '@angular/core';
 import { GraphQLDataSourceService } from '@poweredsoft/ngx-data-apollo';
 import { IDataSource, DataSource } from '@poweredsoft/data';
-
-export interface IMerchant{
-  id: string,
-  name: string,
-  address: string
-}
+import { Apollo } from 'apollo-angular';
+import { gql } from 'graphql-tag';
+import { of } from 'rxjs';
+import { IChangeMerchantNameCommand } from './IChangeMerchantNameCommand';
+import { IMerchant } from './IMerchant';
 
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 export class MerchantService {
-
-  constructor(private dataSourceGenericService: GraphQLDataSourceService) {
-
-    dataSourceGenericService
-  }
+  constructor(
+    private dataSourceGenericService: GraphQLDataSourceService,
+    private apollo: Apollo
+  ) {}
 
   createMerchantDataSource(): IDataSource<IMerchant> {
-    const optionsBuilder = this.dataSourceGenericService.createDataSourceOptionsBuilder<IMerchant, string>(
+    const builder = this.dataSourceGenericService.createDataSourceOptionsBuilder<
+      IMerchant,
+      string
+    >(
       'merchants',
       'GraphQLAdvanceQueryOfMerchantInput',
       'id, name, address',
       (model) => model.id,
       {
         page: 1,
-        pageSize: 4
+        pageSize: 4,
       },
       true
     );
-    const options = optionsBuilder.create();
+
+    builder.addMutation<IChangeMerchantNameCommand, string>(
+      'changeMerchantName', //<-- command name
+      'changeMerchantName', //<-- graph ql mutation name
+      
+      // implementation of the command.
+      command => {
+        return this.apollo.use('command').mutate<string>({
+          mutation: gql`
+            mutation executeChangeName($command: changeMerchantNameInput) {
+              changeMerchantName(params: $command)
+            }
+          `,
+          variables: {
+            command: command,
+          },
+        });
+      },
+      
+      // viewModel -> transform to the form model for that command -> IChangeMerchantName
+      e => of(<IChangeMerchantNameCommand>{
+        merchantId: e.model.id,
+        newName: e.model.name,
+      })
+    );
+
+    const options = builder.create();
     return new DataSource<IMerchant>(options);
   }
 }