add server to monorepo.

packages/server/src/repositories/VendorRepository.ts

@@ -0,0 +1,50 @@
+import { Vendor } from "models";
+import TenantRepository from "./TenantRepository";
+
+export default class VendorRepository extends TenantRepository {
+  /**
+   * Contact repository. 
+   */
+  constructor(knex, cache, i18n) {
+    super(knex, cache, i18n);
+    this.repositoryName = 'VendorRepository';
+  }
+
+  /**
+   * Gets the repository's model.
+   */
+  get model() {
+    return Vendor.bindKnex(this.knex);
+  }
+
+  unpaid() {
+      
+  }
+
+  changeBalance(vendorId: number, amount: number) {
+    return super.changeNumber({ id: vendorId }, 'balance', amount);
+  }
+
+  async changeDiffBalance(
+    vendorId: number,
+    amount: number,
+    oldAmount: number,
+    oldVendorId?: number,
+  ) {
+    const diffAmount = amount - oldAmount;
+    const asyncOpers = [];
+    const _oldVendorId = oldVendorId || vendorId;
+
+    if (vendorId != _oldVendorId) {
+      const oldCustomerOper = this.changeBalance(_oldVendorId, (oldAmount * -1));
+      const customerOper = this.changeBalance(vendorId, amount);
+
+      asyncOpers.push(customerOper);
+      asyncOpers.push(oldCustomerOper);
+    } else {
+      const balanceChangeOper = this.changeBalance(vendorId, diffAmount);
+      asyncOpers.push(balanceChangeOper);
+    }
+    await Promise.all(asyncOpers);
+  }
+}