fix: now parent can be expanded in external api (#5511)

apiserver/plane/api/serializers/__init__.py

@@ -10,6 +10,7 @@ from .issue import (
     IssueAttachmentSerializer,
     IssueActivitySerializer,
     IssueExpandSerializer,
+    IssueLiteSerializer,
 )
 from .state import StateLiteSerializer, StateSerializer
 from .cycle import CycleSerializer, CycleIssueSerializer, CycleLiteSerializer

apiserver/plane/api/serializers/base.py

@@ -67,6 +67,7 @@ class BaseSerializer(serializers.ModelSerializer):
                     # Import all the expandable serializers
                     from . import (
                         IssueSerializer,
+                        IssueLiteSerializer,
                         ProjectLiteSerializer,
                         StateLiteSerializer,
                         UserLiteSerializer,
@@ -86,6 +87,7 @@ class BaseSerializer(serializers.ModelSerializer):
                         "actor": UserLiteSerializer,
                         "owned_by": UserLiteSerializer,
                         "members": UserLiteSerializer,
+                        "parent": IssueLiteSerializer,
                     }
                     # Check if field in expansion  then expand the field
                     if expand in expansion:

apiserver/plane/api/serializers/issue.py

@@ -274,6 +274,17 @@ class IssueSerializer(BaseSerializer):
         return data
 
 
+class IssueLiteSerializer(BaseSerializer):
+    class Meta:
+        model = Issue
+        fields = [
+            "id",
+            "sequence_id",
+            "project_id",
+        ]
+        read_only_fields = fields
+
+
 class LabelSerializer(BaseSerializer):
     class Meta:
         model = Label