🐛(backend) route share invitation link to file view for files

Clicking the invitation link for a shared file opened the folder
explorer page with an empty children listing, because
`Item.send_email` hardcoded `/explorer/items/<uuid>/` regardless of
the item type.

Branch on `item.type` to use the dedicated file route
`/explorer/items/files/<uuid>/` already served by nginx and used by
the in-app share-link copy button.

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to
 - 🐛(front) set size and variant on trash navigate modal #666
 - 🐛(frontend) fix uploads continuing after parent folder deletion
 - 🐛(frontend) fix SDK picker link reach promotion
+- 🐛(backend) route share invitation link to file view for files
 
 ### Fixed
 

src/backend/core/models.py

@@ -922,7 +922,11 @@ class Item(TreeModel, BaseModel):
                 "brandname": settings.EMAIL_BRAND_NAME,
                 "item": self,
                 "domain": domain,
-                "link": f"{domain}/explorer/items/{self.id}/",
+                "link": (
+                    f"{domain}/explorer/items/files/{self.id}/"
+                    if self.type == ItemTypeChoices.FILE
+                    else f"{domain}/explorer/items/{self.id}/"
+                ),
                 "logo_img": settings.EMAIL_LOGO_IMG,
             }
         )

src/backend/core/tests/test_models_items.py

@@ -759,7 +759,7 @@ def test_models_items__email_invitation__success():
     """
     The email invitation is sent successfully.
     """
-    item = factories.ItemFactory()
+    item = factories.ItemFactory(type=models.ItemTypeChoices.FOLDER)
 
     # pylint: disable-next=no-member
     assert len(mail.outbox) == 0
@@ -787,7 +787,7 @@ def test_models_items__email_invitation__success_fr():
     """
     The email invitation is sent successfully in french.
     """
-    item = factories.ItemFactory()
+    item = factories.ItemFactory(type=models.ItemTypeChoices.FOLDER)
 
     # pylint: disable-next=no-member
     assert len(mail.outbox) == 0
@@ -816,6 +816,37 @@ def test_models_items__email_invitation__success_fr():
     assert f"items/{item.id}/" in email_content
 
 
+def test_models_items__email_invitation__link_for_folder():
+    """
+    The invitation email link for a folder item points to the folder explorer route.
+    """
+    item = factories.ItemFactory(type=models.ItemTypeChoices.FOLDER)
+    sender = factories.UserFactory()
+
+    item.send_invitation_email("guest-folder@example.com", models.RoleChoices.EDITOR, sender, "en")
+
+    # pylint: disable-next=no-member
+    email = mail.outbox[-1]
+    assert f"/explorer/items/{item.id}/" in email.body
+    assert f"/explorer/items/files/{item.id}/" not in email.body
+
+
+def test_models_items__email_invitation__link_for_file():
+    """
+    The invitation email link for a file item points to the dedicated file route,
+    so the recipient opens the file preview rather than an empty folder view.
+    """
+    item = factories.ItemFactory(type=models.ItemTypeChoices.FILE, filename="doc.pdf")
+    sender = factories.UserFactory()
+
+    item.send_invitation_email("guest-file@example.com", models.RoleChoices.EDITOR, sender, "en")
+
+    # pylint: disable-next=no-member
+    email = mail.outbox[-1]
+    assert f"/explorer/items/files/{item.id}/" in email.body
+    assert f"/explorer/items/{item.id}/" not in email.body
+
+
 @mock.patch(
     "core.models.send_mail",
     side_effect=smtplib.SMTPException("Error SMTPException"),