feat: упростить создание заказов и рефакторинг единиц измерения

- Добавить inline-редактирование цен в списке товаров
- Оптимизировать карточки товаров в POS-терминале
- Рефакторинг моделей единиц измерения
- Миграция unit -> base_unit в SalesUnit
- Улучшить UI форм создания/редактирования товаров

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

myproject/products/views/product_views.py

@@ -10,7 +10,7 @@ from django.db.models.functions import Coalesce
 from itertools import chain
 
 from ..models import Product, ProductCategory, ProductTag, ProductKit
-from ..forms import ProductForm
+from ..forms import ProductForm, ProductSalesUnitFormSet
 from .utils import handle_photos
 from ..models import ProductPhoto
 from user_roles.mixins import ManagerOwnerRequiredMixin
@@ -110,11 +110,36 @@ class ProductCreateView(LoginRequiredMixin, ManagerOwnerRequiredMixin, CreateVie
     def get_success_url(self):
         return reverse_lazy('products:products-list')
 
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        if self.request.POST:
+            context['sales_unit_formset'] = ProductSalesUnitFormSet(
+                self.request.POST,
+                prefix='sales_units'
+            )
+        else:
+            context['sales_unit_formset'] = ProductSalesUnitFormSet(prefix='sales_units')
+        return context
+
     def form_valid(self, form):
         from django.db import IntegrityError
 
+        context = self.get_context_data()
+        sales_unit_formset = context['sales_unit_formset']
+
         try:
-            response = super().form_valid(form)
+            # Сначала сохраняем товар
+            self.object = form.save()
+
+            # Затем сохраняем единицы продажи
+            if sales_unit_formset.is_valid():
+                sales_unit_formset.instance = self.object
+                sales_unit_formset.save()
+            else:
+                # Если formset невалиден, показываем ошибки
+                for error in sales_unit_formset.errors:
+                    if error:
+                        messages.warning(self.request, f'Ошибка в единицах продажи: {error}')
 
             # Обработка загрузки фотографий
             photo_errors = handle_photos(self.request, self.object, ProductPhoto, 'product')
@@ -127,7 +152,7 @@ class ProductCreateView(LoginRequiredMixin, ManagerOwnerRequiredMixin, CreateVie
                         messages.error(self.request, error)
 
             messages.success(self.request, f'Товар "{form.instance.name}" успешно создан!')
-            return response
+            return super().form_valid(form)
 
         except IntegrityError as e:
             # Обработка ошибки дублирования slug'а или других unique constraints
@@ -161,7 +186,7 @@ class ProductDetailView(LoginRequiredMixin, ManagerOwnerRequiredMixin, DetailVie
             'photos',
             'categories',
             'tags',
-            'sales_units__unit'
+            'sales_units'
         ).annotate(
             total_available=total_available,
             total_reserved=total_reserved,
@@ -199,13 +224,40 @@ class ProductUpdateView(LoginRequiredMixin, ManagerOwnerRequiredMixin, UpdateVie
         # Добавляем фотографии товара в контекст
         context['product_photos'] = self.object.photos.all().order_by('order', 'created_at')
         context['photos_count'] = self.object.photos.count()
+
+        # Добавляем formset единиц продажи
+        if self.request.POST:
+            context['sales_unit_formset'] = ProductSalesUnitFormSet(
+                self.request.POST,
+                instance=self.object,
+                prefix='sales_units'
+            )
+        else:
+            context['sales_unit_formset'] = ProductSalesUnitFormSet(
+                instance=self.object,
+                prefix='sales_units'
+            )
         return context
 
     def form_valid(self, form):
         from django.db import IntegrityError
 
+        context = self.get_context_data()
+        sales_unit_formset = context['sales_unit_formset']
+
         try:
-            response = super().form_valid(form)
+            # Сначала сохраняем товар
+            self.object = form.save()
+
+            # Затем сохраняем единицы продажи
+            if sales_unit_formset.is_valid():
+                sales_unit_formset.instance = self.object
+                sales_unit_formset.save()
+            else:
+                # Если formset невалиден, показываем ошибки
+                for error in sales_unit_formset.errors:
+                    if error:
+                        messages.warning(self.request, f'Ошибка в единицах продажи: {error}')
 
             # Обработка загрузки фотографий
             photo_errors = handle_photos(self.request, self.object, ProductPhoto, 'product')
@@ -218,7 +270,7 @@ class ProductUpdateView(LoginRequiredMixin, ManagerOwnerRequiredMixin, UpdateVie
                         messages.error(self.request, error)
 
             messages.success(self.request, f'Товар "{form.instance.name}" успешно обновлен!')
-            return response
+            return super().form_valid(form)
 
         except IntegrityError as e:
             # Обработка ошибки дублирования slug'а или других unique constraints