feat(utils,link-modules): link between fulfillment provider and stock location (#8275)

what:

- adds link between fulfillment provider and stock location

RESOLVES CC-233

packages/core/utils/src/link/links.ts

@@ -44,6 +44,12 @@ export const LINKS = {
     Modules.STOCK_LOCATION,
     "location_id"
   ),
+  LocationFulfillmentProvider: composeLinkName(
+    Modules.STOCK_LOCATION,
+    "stock_location_id",
+    Modules.FULFILLMENT,
+    "fulfillment_provider_id"
+  ),
   LocationFulfillmentSet: composeLinkName(
     Modules.STOCK_LOCATION,
     "stock_location_id",

packages/modules/link-modules/src/definitions/fulfillment-provider-location.ts

@@ -0,0 +1,68 @@
+import { ModuleJoinerConfig } from "@medusajs/types"
+import { LINKS, Modules } from "@medusajs/utils"
+
+export const LocationFulfillmentProvider: ModuleJoinerConfig = {
+  serviceName: LINKS.LocationFulfillmentProvider,
+  isLink: true,
+  databaseConfig: {
+    tableName: "location_fulfillment_provider",
+    idPrefix: "locfp",
+  },
+  alias: [
+    {
+      name: ["location_fulfillment_provider", "location_fulfillment_providers"],
+      args: { entity: "LinkLocationFulfillmentProvider" },
+    },
+  ],
+  primaryKeys: ["id", "stock_location_id", "fulfillment_provider_id"],
+  relationships: [
+    {
+      serviceName: Modules.STOCK_LOCATION,
+      primaryKey: "id",
+      foreignKey: "stock_location_id",
+      alias: "location",
+      args: { methodSuffix: "StockLocations" },
+    },
+    {
+      serviceName: Modules.FULFILLMENT,
+      primaryKey: "id",
+      foreignKey: "fulfillment_provider_id",
+      alias: "fulfillment_provider",
+      args: { methodSuffix: "FulfillmentProviders" },
+    },
+  ],
+  extends: [
+    {
+      serviceName: Modules.STOCK_LOCATION,
+      relationship: {
+        serviceName: LINKS.LocationFulfillmentProvider,
+        primaryKey: "stock_location_id",
+        foreignKey: "id",
+        alias: "fulfillment_provider_link",
+        isList: true,
+      },
+      fieldAlias: {
+        fulfillment_providers: {
+          path: "fulfillment_provider_link.fulfillment_provider",
+          isList: true,
+        },
+      },
+    },
+    {
+      serviceName: Modules.FULFILLMENT,
+      relationship: {
+        serviceName: LINKS.LocationFulfillmentProvider,
+        primaryKey: "fulfillment_provider_id",
+        foreignKey: "id",
+        alias: "locations_link",
+        isList: true,
+      },
+      fieldAlias: {
+        locations: {
+          path: "locations_link.location",
+          isList: true,
+        },
+      },
+    },
+  ],
+}