Add UI support for Product.deleted column.

This leverages the 'products.view_deleted' permission to hide products
which are marked as deleted from various views.  Also adds a 'deleted'
class to product grid rows where the flag is set, and adds a flash warning
when viewing a deleted product.

tailbone/views/crud.py

@@ -162,6 +162,10 @@ class CrudView(View):
 
             self.validation_failed(form)
 
+        result = self.post_crud(model, form)
+        if result is not None:
+            return result
+
         kwargs = self.template_kwargs(form)
         kwargs['form'] = form
         return kwargs
@@ -169,6 +173,9 @@ class CrudView(View):
     def pre_crud(self, model):
         pass
 
+    def post_crud(self, model, form):
+        pass
+
     def template_kwargs(self, form):
         if not form.creating and is_versioned(self.mapped_class):
             return {'version_count': self.count_versions()}

tailbone/views/products.py

@@ -184,6 +184,8 @@ class ProductsGrid(SearchableAlchemyGridView):
 
     def query(self):
         q = self.make_query()
+        if not self.request.has_perm('products.view_deleted'):
+            q = q.filter(model.Product.deleted == False)
         q = q.options(joinedload(Product.brand))
         q = q.options(joinedload(Product.department))
         q = q.options(joinedload(Product.subdepartment))
@@ -194,7 +196,12 @@ class ProductsGrid(SearchableAlchemyGridView):
 
     def grid(self):
         def extra_row_class(row, i):
-            return 'not-for-sale' if row.not_for_sale else None
+            cls = []
+            if row.not_for_sale:
+                cls.append('not-for-sale')
+            if row.deleted:
+                cls.append('deleted')
+            return ' '.join(cls) if cls else None
         g = self.make_grid(extra_row_class=extra_row_class)
         g.upc.set(renderer=GPCFieldRenderer)
         g.regular_price.set(renderer=PriceFieldRenderer)
@@ -278,12 +285,20 @@ class ProductCrud(CrudView):
                 fs.regular_price,
                 fs.current_price,
                 fs.not_for_sale,
+                fs.deleted,
                 ])
         if not self.readonly:
             del fs.regular_price
             del fs.current_price
         return fs
 
+    def pre_crud(self, product):
+        self.product_deleted = not self.creating and product.deleted
+
+    def post_crud(self, product, form):
+        if self.product_deleted:
+            self.request.session.flash("This product is marked as deleted.", 'error')
+
     def template_kwargs(self, form):
         kwargs = super(ProductCrud, self).template_kwargs(form)
         kwargs['image'] = False
@@ -310,6 +325,25 @@ class ProductVersionView(VersionView):
         (model.ProductPrice, 'product_uuid'),
         ]
 
+    def warn_if_deleted(self):
+        """
+        Maybe set flash warning if product is marked deleted.
+        """
+        uuid = self.request.matchdict['uuid']
+        product = Session.query(model.Product).get(uuid)
+        assert product, "No product found for UUID: {0}".format(repr(uuid))
+        if product.deleted:
+            self.request.session.flash("This product is marked as deleted.", 'error')
+
+    def list(self):
+        self.warn_if_deleted()
+        return super(ProductVersionView, self).list()
+
+    def details(self):
+        self.warn_if_deleted()
+        return super(ProductVersionView, self).details()
+
+
 
 def products_search(request):
     """
@@ -328,10 +362,13 @@ def products_search(request):
             upc = GPC(upc, calc_check_digit='upc')
             product = get_product_by_upc(Session, upc)
         if product:
-            product = {
-                'uuid':                 product.uuid,
-                'full_description':     product.full_description,
-                }
+            if product.deleted and not request.has_perm('products.view_deleted'):
+                product = None
+            else:
+                product = {
+                    'uuid':                 product.uuid,
+                    'full_description':     product.full_description,
+                    }
     return {'product': product}