Improve display of purchase credit data

esp. within a receiving batch row

tailbone/views/purchasing/batch.py

@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2018 Lance Edgar
+#  Copyright © 2010-2019 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -34,9 +34,9 @@ from rattail.time import localtime
 import colander
 from deform import widget as dfwidget
 from pyramid import httpexceptions
-from webhelpers2.html import tags
+from webhelpers2.html import tags, HTML
 
-from tailbone import forms
+from tailbone import forms, grids
 from tailbone.views.batch import BatchMasterView
 
 
@@ -646,7 +646,6 @@ class PurchasingBatchView(BatchMasterView):
 
         # readonly fields
         f.set_readonly('case_quantity')
-        f.set_readonly('credits')
 
         # quantity fields
         f.set_type('case_quantity', 'quantity')
@@ -670,6 +669,10 @@ class PurchasingBatchView(BatchMasterView):
         # upc
         f.set_type('upc', 'gpc')
 
+        # credits
+        f.set_readonly('credits')
+        f.set_renderer('credits', self.render_row_credits)
+
         if self.creating:
             f.remove_fields(
                 'upc',
@@ -704,6 +707,29 @@ class PurchasingBatchView(BatchMasterView):
             else:
                 f.remove_field('product')
 
+    def render_row_credits(self, row, field):
+        if not row.credits:
+            return ""
+
+        route_prefix = self.get_route_prefix()
+        columns = [
+            'credit_type',
+            'cases_shorted',
+            'units_shorted',
+            'credit_total',
+        ]
+        g = grids.Grid(
+            key='{}.row_credits'.format(route_prefix),
+            data=row.credits,
+            columns=columns,
+            labels={'credit_type': "Type",
+                    'cases_shorted': "Cases",
+                    'units_shorted': "Units"})
+        g.set_type('cases_shorted', 'quantity')
+        g.set_type('units_shorted', 'quantity')
+        g.set_type('credit_total', 'currency')
+        return HTML.literal(g.render_grid())
+
     def configure_mobile_row_form(self, f):
         super(PurchasingBatchView, self).configure_mobile_row_form(f)
         # row = f.model_instance