Add desktop support for creating inventory batches

with a workflow form of sorts

tailbone/forms/core.py

@@ -585,11 +585,14 @@ class Form(object):
         else:
             raise ValueError("unknown type for '{}' field: {}".format(key, type_))
 
-    def set_enum(self, key, enum):
+    def set_enum(self, key, enum, empty=None):
         if enum:
             self.enums[key] = enum
             self.set_type(key, 'enum')
-            self.set_widget(key, dfwidget.SelectWidget(values=list(enum.items())))
+            values = list(enum.items())
+            if empty:
+                values.insert(0, empty)
+            self.set_widget(key, dfwidget.SelectWidget(values=values))
         else:
             self.enums.pop(key, None)
 

tailbone/forms/types.py

@@ -26,9 +26,12 @@ Form Schema Types
 
 from __future__ import unicode_literals, absolute_import
 
+import re
+
 import six
 
 from rattail.db import model
+from rattail.gpc import GPC
 
 import colander
 
@@ -60,6 +63,28 @@ class JQueryTime(colander.Time):
         return colander.timeparse(cstruct, formats[0])
 
 
+class GPCType(colander.SchemaType):
+    """
+    Schema type for product GPC data.
+    """
+
+    def serialize(self, node, appstruct):
+        if appstruct is colander.null:
+            return colander.null
+        return six.text_type(appstruct)
+
+    def deserialize(self, node, cstruct):
+        if not cstruct:
+            return None
+        digits = re.sub(r'\D', '', cstruct)
+        if not digits:
+            return None
+        try:
+            return GPC(digits)
+        except Exception as err:
+            raise colander.Invalid(node, six.text_type(err))
+
+
 class ModelType(colander.SchemaType):
     """
     Custom schema type for scalar ORM relationship fields.