chore: discount module

src/modules/invoices/entities/invoice.entity.ts

@@ -5,6 +5,7 @@ import { Column, Entity, ManyToOne, OneToMany } from "typeorm";
 import { InvoiceItem } from "./invoice-item.entity";
 import { BaseEntity } from "../../../common/entities/base.entity";
 import { DecimalTransformer } from "../../../common/transformers/decimal.transformer";
+import { Discount } from "../../discounts/entities/discount.entity";
 import { User } from "../../users/entities/user.entity";
 import { InvoiceStatus } from "../enums/invoice-status.enum";
 
@@ -28,9 +29,14 @@ export class Invoice extends BaseEntity {
   @Column({ type: "int", default: 0 })
   tax: number;
 
+  //---------------------------------------------
+
   @OneToMany(() => InvoiceItem, (invoiceItem) => invoiceItem.invoice, { cascade: true })
   items: InvoiceItem[];
 
+  @ManyToOne(() => Discount, { nullable: true, onDelete: "SET NULL" })
+  discount: Discount;
+
   get isOverdue(): boolean {
     return this.status === InvoiceStatus.PENDING && new Date() > this.dueDate;
   }