refactor: migrate cart module to DML (medusajs#10385)

FIXES: FRMW-2815

This PR has no breaking changes

.changeset/sour-cats-sort.md

@@ -0,0 +1,6 @@
+---
+"@medusajs/cart": patch
+"@medusajs/utils": patch
+---
+
+refactor: migrate cart module to DML

packages/core/utils/src/dml/relations/index.ts

@@ -4,3 +4,4 @@ export * from "./has-many"
 export * from "./has-one"
 export * from "./many-to-many"
 export * from "./nullable"
+export * from "./has-one-fk"

packages/modules/cart/integration-tests/__fixtures__/cart/index.ts

@@ -1,18 +1,19 @@
-import { CreateCartDTO } from "@medusajs/framework/types"
+import { CreateCartDTO, InferEntityType } from "@medusajs/framework/types"
 import { SqlEntityManager } from "@mikro-orm/postgresql"
 import { Cart } from "../../../src/models"
 import { defaultCartsData } from "./data"
+import { toMikroORMEntity } from "@medusajs/framework/utils"
 
 export * from "./data"
 
 export async function createCarts(
   manager: SqlEntityManager,
   cartsData: CreateCartDTO[] = defaultCartsData
-): Promise<Cart[]> {
-  const carts: Cart[] = []
+): Promise<InferEntityType<typeof Cart>[]> {
+  const carts: InferEntityType<typeof Cart>[] = []
 
   for (let cartData of cartsData) {
-    let cart = manager.create(Cart, cartData)
+    let cart = manager.create(toMikroORMEntity(Cart), cartData)
 
     await manager.persistAndFlush(cart)
   }