Add CostFieldRenderer and tweak product view template

latter being for easier customization

tailbone/forms/renderers/__init__.py

@@ -44,7 +44,7 @@ from .vendors import VendorFieldRenderer, PurchaseFieldRenderer
 from .products import (GPCFieldRenderer, ScancodeFieldRenderer,
                        DepartmentFieldRenderer, SubdepartmentFieldRenderer, CategoryFieldRenderer,
                        BrandFieldRenderer, ProductFieldRenderer,
-                       PriceFieldRenderer, PriceWithExpirationFieldRenderer)
+                       CostFieldRenderer, PriceFieldRenderer, PriceWithExpirationFieldRenderer)
 
 from .custorders import CustomerOrderFieldRenderer
 

tailbone/forms/renderers/products.py

@@ -1,8 +1,8 @@
-# -*- coding: utf-8 -*-
+# -*- coding: utf-8; -*-
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2016 Lance Edgar
+#  Copyright © 2010-2017 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -30,6 +30,7 @@ from rattail.gpc import GPC
 from rattail.db import model
 from rattail.db.util import maxlen
 
+import formalchemy as fa
 from formalchemy import TextFieldRenderer
 from formalchemy.fields import SelectFieldRenderer
 from webhelpers.html import tags, literal
@@ -158,6 +159,18 @@ class BrandFieldRenderer(AutocompleteFieldRenderer):
     service_route = 'brands.autocomplete'
 
 
+class CostFieldRenderer(fa.FieldRenderer):
+    """
+    Renders fields which reference a ProductCost object
+    """
+
+    def render_readonly(self, **kwargs):
+        cost = self.raw_value
+        if not cost:
+            return ''
+        return '${:0.2f}'.format(cost.unit_cost)
+
+
 class PriceFieldRenderer(TextFieldRenderer):
     """
     Renderer for fields which reference a :class:`ProductPrice` instance.