Refactor some things, per patterns learned w/ woocommerce

tailbone_corepos/templates/corepos-util.mako

@@ -1,18 +1,22 @@
 ## -*- coding: utf-8; -*-
 
+<%def name="render_xref_button()">
+  <b-button type="is-primary"
+            % if core_office_url:
+            tag="a" href="${core_office_url}" target="_blank"
+            % else:
+            disabled title="${core_office_why_no_url}"
+            % endif
+            >
+    View in CORE Office
+  </b-button>
+</%def>
+
 <%def name="render_xref_helper()">
   <div class="object-helper">
     <h3>Cross-Reference</h3>
     <div class="object-helper-content">
-      <b-button type="is-primary"
-                % if core_office_url:
-                tag="a" href="${core_office_url}" target="_blank"
-                % else:
-                disabled title="${core_office_why_no_url}"
-                % endif
-                >
-        View in CORE Office
-      </b-button>
+      ${self.render_xref_button()}
     </div>
   </div>
 </%def>

tailbone_corepos/templates/products/view.mako

@@ -1,13 +1,26 @@
 ## -*- coding: utf-8; -*-
 <%inherit file="tailbone:templates/products/view.mako" />
-<%namespace file="/corepos-util.mako" import="render_xref_helper" />
+<%namespace name="corepos" file="/corepos-util.mako" />
 
 <%def name="object_helpers()">
   ${parent.object_helpers()}
-  ${render_xref_helper()}
+  ${self.render_xref_helper()}
+</%def>
+
+<%def name="render_xref_helper()">
+  ${corepos.render_xref_helper()}
+</%def>
+
+<%def name="render_xref_button()">
+  ${corepos.render_xref_button()}
 </%def>
 
 <%def name="extra_main_fields(form)">
+  ${parent.extra_main_fields(form)}
+  ${self.extra_main_fields_corepos(form)}
+</%def>
+
+<%def name="extra_main_fields_corepos(form)">
   ${form.render_field_readonly('corepos_id')}
 </%def>
 

tailbone_corepos/views/products.py

@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2020 Lance Edgar
+#  Copyright © 2010-2021 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -40,23 +40,35 @@ class ProductView(base.ProductsView):
     @property
     def form_fields(self):
         fields = super(ProductView, self).form_fields
-        return fields + [
+        return self.corepos_add_form_fields(fields)
+
+    def corepos_add_form_fields(self, fields):
+        fields.extend([
             'corepos_id',
-        ]
+        ])
+        return fields
 
     def query(self, session):
         query = super(ProductView, self).query(session)
+        return self.corepos_modify_query(query)
+
+    def corepos_modify_query(self, query):
         model = self.rattail_config.get_model()
         return query.outerjoin(model.CoreProduct)
 
     def configure_grid(self, g):
         super(ProductView, self).configure_grid(g)
+        self.corepos_configure_grid(g)
+
+    def corepos_configure_grid(self, g):
         model = self.rattail_config.get_model()
         g.set_filter('corepos_id', model.CoreProduct.corepos_id)
 
     def configure_form(self, f):
         super(ProductView, self).configure_form(f)
+        self.corepos_configure_form(f)
 
+    def corepos_configure_form(self, f):
         f.set_required('corepos_id', False)
         if self.creating:
             f.remove('corepos_id')
@@ -65,28 +77,35 @@ class ProductView(base.ProductsView):
         if data is None:
             data = form.validated
         product = super(ProductView, self).objectify(form, data)
+        return self.corepos_objectify(product)
 
+    def corepos_objectify(self, product):
         # remove the corepos extension record outright, if we just lost the ID
         if product._corepos and not product.corepos_id:
             self.Session.delete(product._corepos)
             self.Session.flush()
-
         return product
 
     def get_version_child_classes(self):
+        classes = super(ProductView, self).get_version_child_classes()
+        return self.corepos_add_version_classes(classes)
+
+    def corepos_add_version_classes(self, classes):
         model = self.rattail_config.get_model()
-        return super(ProductView, self).get_version_child_classes() + [
+        classes.extend([
             model.CoreProduct,
-        ]
+        ])
+        return classes
 
     def template_kwargs_view(self, **kwargs):
-        """
-        Supplements the default logic as follows:
+        kwargs = super(ProductView, self).template_kwargs_view(**kwargs)
+        return self.corepos_template_kwargs_view(**kwargs)
 
+    def corepos_template_kwargs_view(self, **kwargs):
+        """
         Adds the URL for viewing the product within CORE Office, or else the
         reason for lack of such a URL.
         """
-        kwargs = super(ProductView, self).template_kwargs_view(**kwargs)
         product = kwargs['instance']
 
         # CORE Office URL