From 4401163d3f7bb99fd958401fd010ececcccfdc83 Mon Sep 17 00:00:00 2001
From: Toksi <puma-yellow@yandex.ru>
Date: Tue, 25 Nov 2025 15:08:28 +0500
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---
 projects/views.py | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/projects/views.py b/projects/views.py
index 5820f58a..2e4f3181 100644
--- a/projects/views.py
+++ b/projects/views.py
@@ -671,6 +671,43 @@ def patch(self, request, project_pk: int, user_to_leader_pk: int) -> Response:
 class DuplicateProjectView(APIView):
     permission_classes = [IsAuthenticated, CanBindProjectToProgram]
 
+    @staticmethod
+    def _copy_collaborators(original_project: Project, new_project: Project) -> None:
+        """
+        Copy all collaborators from the source project to the duplicated one.
+        Keep the leader collaborator (auto-created by signal) in sync with the original.
+        """
+        leader_id = new_project.leader_id
+        collaborators_to_create: list[Collaborator] = []
+        leader_collaborator = None
+
+        for collaborator in original_project.collaborator_set.select_related("user").all():
+            if collaborator.user_id == leader_id:
+                leader_collaborator = collaborator
+                continue
+
+            collaborators_to_create.append(
+                Collaborator(
+                    user=collaborator.user,
+                    project=new_project,
+                    role=collaborator.role,
+                    specialization=collaborator.specialization,
+                )
+            )
+
+        if collaborators_to_create:
+            Collaborator.objects.bulk_create(collaborators_to_create)
+
+        if leader_collaborator:
+            Collaborator.objects.update_or_create(
+                user_id=leader_id,
+                project=new_project,
+                defaults={
+                    "role": leader_collaborator.role,
+                    "specialization": leader_collaborator.specialization,
+                },
+            )
+
     @swagger_auto_schema(
         request_body=ProjectDuplicateRequestSerializer,
         responses={201: ProjectDuplicateRequestSerializer(), 400: "Validation error"},
@@ -706,6 +743,8 @@ def post(self, request):
                 cover=original_project.cover,
             )
 
+            self._copy_collaborators(original_project, new_project)
+
             program_link = PartnerProgramProject.objects.create(
                 partner_program=partner_program, project=new_project
             )