feat(medusa): Cart custom query strategy (#4083)

packages/medusa/src/models/cart.ts

@@ -216,6 +216,7 @@
  */
 
 import {
+  AfterLoad,
   BeforeInsert,
   Column,
   Entity,
@@ -390,6 +391,13 @@ export class Cart extends SoftDeletableEntity {
   gift_card_total?: number
   gift_card_tax_total?: number
 
+  @AfterLoad()
+  private afterLoad(): void {
+    if (this.payment_sessions) {
+      this.payment_session = this.payment_sessions.find((p) => p.is_selected)!
+    }
+  }
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "cart")