Add GroupAddMembersForm and view for editing group members

game/forms.py

@@ -0,0 +1,15 @@
+from django import forms
+
+from . import models
+
+
+class GroupAddMembersForm(forms.ModelForm):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields["members"].queryset = self.fields["members"].queryset.exclude(
+            id=self.instance.owner.id
+        )
+
+    class Meta:
+        model = models.Group
+        fields = ["members"]