Add chat hiding mentions follow counts waveform and post fixes

src/modules/collaboration-requests/collaboration-requests.service.ts

@@ -62,7 +62,10 @@ export class CollaborationRequestsService {
       throw new NotFoundException('Post not found');
     }
 
-    const targetUserId = post.authorId.toString();
+    const targetUserId = this.extractEntityId(post.authorId);
+    if (!Types.ObjectId.isValid(targetUserId)) {
+      throw new BadRequestException('Post owner is invalid');
+    }
 
     if (requesterId === targetUserId) {
       throw new BadRequestException('You cannot request collaboration on your own post');
@@ -345,10 +348,11 @@ export class CollaborationRequestsService {
   private buildCollaborationDetails(
     dto: CreateCollaborationRequestDto | CreateGeneralCollaborationRequestDto,
   ) {
+    const attachmentUrl = typeof dto.attachmentUrl === 'string' ? dto.attachmentUrl.trim() : '';
     return {
       ...(dto.collaborationType ? { collaborationType: dto.collaborationType } : {}),
       ...(typeof dto.message === 'string' ? { message: dto.message.trim() } : {}),
-      ...(typeof dto.attachmentUrl === 'string' ? { attachmentUrl: dto.attachmentUrl.trim() } : {}),
+      ...(attachmentUrl ? { attachmentUrl } : {}),
       ...(dto.attachmentType ? { attachmentType: dto.attachmentType } : {}),
     };
   }
@@ -565,4 +569,29 @@ export class CollaborationRequestsService {
       deepLink: `/users/${actorId}`,
     };
   }
+
+  private extractEntityId(value: unknown): string {
+    if (!value) {
+      return '';
+    }
+    if (typeof value === 'string') {
+      return value;
+    }
+    if (value instanceof Types.ObjectId) {
+      return value.toString();
+    }
+    if (typeof value === 'object') {
+      const candidate = value as { _id?: unknown; id?: unknown };
+      if (candidate._id instanceof Types.ObjectId) {
+        return candidate._id.toString();
+      }
+      if (typeof candidate._id === 'string') {
+        return candidate._id;
+      }
+      if (typeof candidate.id === 'string') {
+        return candidate.id;
+      }
+    }
+    return '';
+  }
 }