Add game management features: create MusikGame model, implement game creation and detail views, and update group detail template

game/forms.py

@@ -13,3 +13,16 @@ class GroupAddMembersForm(forms.ModelForm):
     class Meta:
         model = models.Group
         fields = ["members"]
+
+
+class MusikGameForm(forms.ModelForm):
+    class Meta:
+        model = models.MusikGame
+        fields = ["players", "n"]
+
+    def __init__(self, *args, **kwargs):
+        group = models.Group.objects.get(pk=kwargs.pop("group", None))
+        super().__init__(*args, **kwargs)
+        self.fields["players"].queryset = (
+            group.members.all() | models.User.objects.filter(id=group.owner.id)
+        )