Fix type errors

fastview/forms.py

@@ -2,18 +2,19 @@
 Form classes
 """
 
-from typing import List, Optional
+from typing import List
 
-from django.forms import ModelForm, BaseInlineFormSet
+from django.forms import BaseInlineFormSet, ModelForm
 
 
 class InlineParentModelForm(ModelForm):
-    formsets: Optional[List[BaseInlineFormSet]]
+    formsets: List[BaseInlineFormSet]
 
-    def add_formset(self, formset: BaseInlineFormSet):
-        if not hasattr(self, "formsets"):
-            self.formsets = []
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.formsets = []
 
+    def add_formset(self, formset: BaseInlineFormSet):
         self.formsets.append(formset)
 
     def is_valid(self):

fastview/views/inlines.py

@@ -6,7 +6,7 @@
 from typing import Any, Dict, Optional, Type
 
 from django.db.models import Model
-from django.forms import ModelForm, BaseInlineFormSet
+from django.forms import BaseInlineFormSet, ModelForm
 from django.forms.models import inlineformset_factory
 
 from ..forms import InlineParentModelForm

fastview/views/mixins.py

@@ -11,15 +11,13 @@
 from django.urls import reverse
 
 from ..constants import INDEX_VIEW
-from ..permissions import Denied, Permission
 from ..forms import InlineParentModelForm
+from ..permissions import Denied, Permission
 from .display import AttributeValue, DisplayValue
 from .objects import AnnotatedObject
 
 
 if TYPE_CHECKING:
-    from django.forms import BaseInlineFormSet
-
     from ..viewgroup import ViewGroup
     from .inlines import Inline
 
@@ -243,6 +241,7 @@ class InlineMixin:
 
     # TODO: Consider merging with FormFieldMixin when adding support for nested inlines
     model: Model  # Help type hinting to identify the intended base classes
+    get_form_kwargs: Callable  # Help type hinting
     inlines: Optional[List[Inline]] = None
 
     def get_form(self, form_class=None):