feat: update customer groups (#1075)

* update customer service prep

* expand on the update customer groups test case

* add the test case for customer group update

* docs for `groups` prop on update customer endpoint

* refactor, update comments

* expend on integration tests, add customer mock with a group

* refactor to use `customerGroupService.list` method

* update units

* remove `updateCustomerGroups`

* fix rebase conflict

* fix customer seed data, add JoinTable on groups

* group retrieval using the expand param

* fix: use `buildQuery_`

* fix: validation for `groups`, enable `expand`param on update customer endpoint

* fix: remove fileds form the `FilterableCustomerGroupProps`

* fix: spearate body/query validation

Co-authored-by: fPolic <frane@medusajs.com>

packages/medusa/src/models/customer.ts

@@ -43,7 +43,10 @@ export class Customer {
   @JoinColumn({ name: "billing_address_id" })
   billing_address: Address
 
-  @OneToMany(() => Address, (address) => address.customer)
+  @OneToMany(
+    () => Address,
+    (address) => address.customer
+  )
   shipping_addresses: Address[]
 
   @Column({ nullable: true, select: false })
@@ -55,9 +58,23 @@ export class Customer {
   @Column({ default: false })
   has_account: boolean
 
-  @OneToMany(() => Order, (order) => order.customer)
+  @OneToMany(
+    () => Order,
+    (order) => order.customer
+  )
   orders: Order[]
 
+  @JoinTable({
+    name: "customer_group_customers",
+    inverseJoinColumn: {
+      name: "customer_group_id",
+      referencedColumnName: "id",
+    },
+    joinColumn: {
+      name: "customer_id",
+      referencedColumnName: "id",
+    },
+  })
   @ManyToMany(() => CustomerGroup, { cascade: true })
   groups: CustomerGroup[]