fix: Correctly list files for all ids that are passed (#12575)

packages/core/types/src/file/service.ts

@@ -135,17 +135,17 @@ export interface IFileModuleService extends IModuleService {
   ): Promise<FileDTO>
 
   /**
-   * This method is used to retrieve a file by ID, similarly to `retrieve`. It doesn't retrieve multiple files, but it's added to support retrieving files with [Query](https://docs.medusajs.com/learn/fundamentals/module-links/query).
+   * This method is used to list files. It only supports filtering by ID.
    *
    * @param {FilterableFileProps} filters - The filters to apply on the retrieved files.
    * @param {FindConfig<FileDTO>} config -
    * The configurations determining how the files are retrieved. Its properties, such as `select` or `relations`, accept the
    * attributes or relations associated with a file.
    * @param {Context} sharedContext - A context used to share resources, such as transaction manager, between the application and the module.
-   * @returns {Promise<FileDTO[]>} The list of files. In this case, it will have at most one file.
+   * @returns {Promise<FileDTO[]>} The list of files.
    *
    * @example
-   * const files = await fileModuleService.listFiles({ id: "file_123" })
+   * const files = await fileModuleService.listFiles({ id: ["file_123", "file_456"] })
    */
   listFiles(
     filters?: FilterableFileProps,
@@ -154,14 +154,14 @@ export interface IFileModuleService extends IModuleService {
   ): Promise<FileDTO[]>
 
   /**
-   * This method is used to retrieve a file by ID, similarly to `retrieve`. It doesn't retrieve multiple files, but it's added to support retrieving files with [Query](https://docs.medusajs.com/learn/fundamentals/module-links/query).
+   * This method is used to list files and their count. It only supports filtering by ID.
    *
    * @param {FilterableFileProps} filters - The filters to apply on the retrieved files.
    * @param {FindConfig<FileDTO>} config -
    * The configurations determining how the files are retrieved. Its properties, such as `select` or `relations`, accept the
    * attributes or relations associated with a file.
    * @param {Context} sharedContext - A context used to share resources, such as transaction manager, between the application and the module.
-   * @returns {Promise<[FileDTO[], number]>} The list of files and their count. In this case, it will have at most one file.
+   * @returns {Promise<[FileDTO[], number]>} The list of files and their count.
    *
    * @example
    * const [files] = await fileModuleService.listAndCountFiles({ id: "file_123" })

packages/modules/file/src/services/file-module-service.ts

@@ -104,28 +104,25 @@ export default class FileModuleService implements FileTypes.IFileModuleService {
     config?: FindConfig<FileDTO>,
     sharedContext?: Context
   ): Promise<FileDTO[]> {
-    const id = Array.isArray(filters?.id) ? filters?.id?.[0] : filters?.id
-    if (!id) {
+    if (!filters?.id) {
       throw new MedusaError(
         MedusaError.Types.INVALID_DATA,
         "Listing of files is only supported when filtering by ID."
       )
     }
 
+    const ids = Array.isArray(filters?.id) ? filters?.id : [filters?.id]
+
+    const res = await Promise.all(
+      ids.map(async (id) => {
         const res = await this.fileProviderService_.getPresignedDownloadUrl({
           fileKey: id,
         })
+        return { id, url: res }
+      })
+    )
 
-    if (!res) {
-      return []
-    }
-
-    return [
-      {
-        id,
-        url: res,
-      },
-    ]
+    return res
   }
 
   async listAndCountFiles(
@@ -133,31 +130,25 @@ export default class FileModuleService implements FileTypes.IFileModuleService {
     config?: FindConfig<FileDTO>,
     sharedContext?: Context
   ): Promise<[FileDTO[], number]> {
-    const id = Array.isArray(filters?.id) ? filters?.id?.[0] : filters?.id
-    if (!id) {
+    if (!filters?.id) {
       throw new MedusaError(
         MedusaError.Types.INVALID_DATA,
-        "Listing and counting of files is only supported when filtering by ID."
+        "Listing of files is only supported when filtering by ID."
       )
     }
 
+    const ids = Array.isArray(filters?.id) ? filters?.id : [filters?.id]
+
+    const res = await Promise.all(
+      ids.map(async (id) => {
         const res = await this.fileProviderService_.getPresignedDownloadUrl({
           fileKey: id,
         })
+        return { id, url: res }
+      })
+    )
 
-    if (!res) {
-      return [[], 0]
-    }
-
-    return [
-      [
-        {
-          id,
-          url: res,
-        },
-      ],
-      1,
-    ]
+    return [res, res.length]
   }
 
   /**