Be sure to update Rattail Product, when VendorItem changes in CORE

b/c of the `Product.case_size` field

rattail_corepos/datasync/rattail.py

@@ -79,16 +79,34 @@ class FromCOREAPIToRattail(NewDataSyncImportConsumer):
                 self.process_change(session, self.importers['Member'],
                                     host_object=member)
 
-        # process all remaining supported models with typical logic
+        # sync all "product meta" changes
         types = [
             'Department',
             'Subdepartment',
             'Vendor',
+        ]
+        for change in [c for c in changes if c.payload_type in types]:
+            # normal logic works fine here
+            self.invoke_importer(session, change)
+
+        # sync all Product-related changes
+        types = [
             'Product',
             'VendorItem',
         ]
         for change in [c for c in changes if c.payload_type in types]:
+
+            # process deletion per usual logic
+            if change.deletion:
                 self.invoke_importer(session, change)
+                if change.payload_type == 'Product':
+                    continue # stop here if we just deleted a Product
+
+            # try to process change for Product
+            product = self.get_product(change)
+            if product:
+                self.process_change(session, self.importers['Product'],
+                                    host_object=product)
 
     def get_host_object(self, session, change):
         if change.payload_type == 'Member':
@@ -108,6 +126,16 @@ class FromCOREAPIToRattail(NewDataSyncImportConsumer):
                 if vendorID.isdigit():
                     return self.api.get_vendor_item(upc, int(vendorID))
 
+    def get_product(self, change):
+        if change.payload_type == 'Product':
+            return self.api.get_product(change.payload_key)
+        if change.payload_type == 'VendorItem':
+            fields = change.payload_key.split('|')
+            if len(fields) == 2:
+                upc, vendorID = fields
+                if upc:
+                    return self.api.get_product(upc)
+
 
 class FromCOREPOSToRattailBase(NewDataSyncImportConsumer):
     """