fix(index): index enum fields (#13428)

https://github.com/medusajs/medusa/issues/13372

What:
 - It handles enum fields corretly when added to filterable fields

.changeset/chilled-pillows-destroy.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/index": patch
+---
+
+fix(index): index enum fields

integration-tests/modules/__tests__/index/query-index.spec.ts

@@ -514,6 +514,49 @@ medusaIntegrationTestRunner({
         expect(resultset.data.length).toEqual(1)
         expect(resultset.data[0].origin_country).toEqual("USA")
       })
+
+      it("should use query.index to filter enum field", async () => {
+        const products = await populateData(api)
+
+        const brandModule = appContainer.resolve("brand")
+        const link = appContainer.resolve(ContainerRegistrationKeys.LINK)
+        const brand = await brandModule.createBrands({
+          name: "Medusa Brand",
+        })
+
+        await link.create({
+          [Modules.PRODUCT]: {
+            product_id: products.find((p) => p.title === "Extra product").id,
+          },
+          brand: {
+            brand_id: brand.id,
+          },
+        })
+
+        const query = appContainer.resolve(
+          ContainerRegistrationKeys.QUERY
+        ) as RemoteQueryFunction
+
+        const resultset = await fetchAndRetry(
+          async () =>
+            await query.index({
+              entity: "product",
+              fields: ["id"],
+              filters: {
+                status: "published",
+                brand: {
+                  status: "active",
+                },
+              },
+            }),
+          ({ data }) => data.length > 0,
+          {
+            retries: 3,
+            waitSeconds: 3,
+          }
+        )
+        expect(resultset.data.length).toEqual(1)
+      })
     })
   },
 })

integration-tests/modules/src/links/product-brand.ts

@@ -12,7 +12,7 @@ const link =
         },
         {
           linkable: BrandModule.linkable.brand.id,
-          filterable: ["id", "name"],
+          filterable: ["id", "name", "status"],
           isList: false,
         }
       )

integration-tests/modules/src/modules/brand/migrations/Migration20250805184935.ts

@@ -3,7 +3,7 @@ import { Migration } from "@mikro-orm/migrations"
 export class Migration20250805184935 extends Migration {
   override async up(): Promise<void> {
     this.addSql(
-      `create table if not exists "brand" ("id" text not null, "name" text not null, "created_at" timestamptz not null default now(), "updated_at" timestamptz not null default now(), "deleted_at" timestamptz null, constraint "brand_pkey" primary key ("id"));`
+      `create table if not exists "brand" ("id" text not null, "name" text not null, "status" text default 'active', "created_at" timestamptz not null default now(), "updated_at" timestamptz not null default now(), "deleted_at" timestamptz null, constraint "brand_pkey" primary key ("id"));`
     )
     this.addSql(
       `CREATE INDEX IF NOT EXISTS "IDX_brand_deleted_at" ON "brand" (deleted_at) WHERE deleted_at IS NULL;`

integration-tests/modules/src/modules/brand/models/brand.ts

@@ -3,4 +3,5 @@ import { model } from "@medusajs/utils"
 export const Brand = model.define("brand", {
   id: model.id({ prefix: "brand" }).primaryKey(),
   name: model.text(),
+  status: model.enum(["active", "inactive"]).default("active"),
 })

packages/modules/index/src/utils/build-config.ts

@@ -1180,11 +1180,13 @@ function buildSchemaFromFilterableLinks(
       return
     }
 
-    const isEnum =
+    const fieldType = fieldRef.type.toString()
-      fieldRef.type?.astNode?.kind === GraphQLUtils.Kind.ENUM_TYPE_DEFINITION
-    const fieldType = isEnum ? "String" : fieldRef.type.toString()
     const isArray = fieldType.startsWith("[")
-    const currentType = fieldType.replace(/\[|\]|\!/g, "")
+    let currentType = fieldType.replace(/\[|\]|\!/g, "")
+    const isEnum = currentType.endsWith("Enum")
+    if (isEnum) {
+      currentType = "String"
+    }
 
     return isArray ? `[${currentType}]` : currentType
   }