Add common logic for xref buttons, links when viewing object

about dang time for this..probaby needs improvement but a good start

tailbone/static/themes/falafel/css/layout.css

@@ -93,6 +93,10 @@ header .level .theme-picker {
  * "object helper" panel
  ******************************/
 
+.object-helpers .panel-heading {
+    white-space: nowrap;
+}
+
 .object-helpers a {
     white-space: nowrap;
 }

tailbone/templates/master/view.mako

@@ -47,6 +47,35 @@
   ${instance_title}
 </%def>
 
+<%def name="object_helpers()">
+  ${parent.object_helpers()}
+  ${self.render_xref_helper()}
+</%def>
+
+<%def name="render_xref_helper()">
+  % if xref_buttons or xref_links:
+      % if use_buefy:
+          <nav class="panel">
+            <p class="panel-heading">Cross-Reference</p>
+            <div class="panel-block">
+              % for link in xref_links:
+                  ${link}
+              % endfor
+            </div>
+          </nav>
+      % else:
+          <div class="object-helper">
+            <h3>Cross-Reference</h3>
+            <div class="object-helper-content">
+              % for link in xref_links:
+                  ${link}
+              % endfor
+            </div>
+          </div>
+      % endif
+  % endif
+</%def>
+
 <%def name="context_menu_items()">
   ## TODO: either make this configurable, or just lose it.
   ## nobody seems to ever find it useful in practice.

tailbone/views/master.py

@@ -2502,8 +2502,23 @@ class MasterView(View):
         """
         Method stub, so subclass can always invoke super() for it.
         """
+        obj = kwargs['instance']
+        kwargs['xref_buttons'] = self.get_xref_buttons(obj)
+        kwargs['xref_links'] = self.get_xref_links(obj)
         return kwargs
 
+    def get_xref_buttons(self, obj):
+        buttons = []
+        for supp in self.iter_view_supplements():
+            buttons.extend(supp.get_xref_buttons(obj))
+        return buttons
+
+    def get_xref_links(self, obj):
+        links = []
+        for supp in self.iter_view_supplements():
+            links.extend(supp.get_xref_links(obj))
+        return links
+
     def template_kwargs_edit(self, **kwargs):
         """
         Method stub, so subclass can always invoke super() for it.
@@ -5062,10 +5077,8 @@ class ViewSupplement(object):
 
     def __init__(self, master):
         self.master = master
-
-    @property
-    def model(self):
-        return self.master.model
+        self.request = master.request
+        self.model = master.model
 
     def get_grid_query(self, query):
         """
@@ -5111,6 +5124,12 @@ class ViewSupplement(object):
         renderers, default values etc. for them.
         """
 
+    def get_xref_buttons(self, obj):
+        return []
+
+    def get_xref_links(self, obj):
+        return []
+
     def get_version_child_classes(self):
         """
         Return a list of additional "version child classes" which are

tailbone/views/products.py

@@ -187,27 +187,12 @@ class ProductView(MasterView):
         self.handler = self.products_handler
 
     def query(self, session):
-        user = self.request.user
-        if user and user not in session:
-            user = session.merge(user)
+        query = super(ProductView, self).query(session)
 
-        query = session.query(model.Product)
-        # TODO: was this old `has_permission()` call here for a reason..? hope not..
-        # if not auth.has_permission(session, user, 'products.view_deleted'):
-        if not self.request.has_perm('products.view_deleted'):
+        if not self.has_perm('view_deleted'):
             query = query.filter(model.Product.deleted == False)
 
-        # TODO: This used to be a good idea I thought...but in dev it didn't
-        # seem to make much difference, except with a larger (50K) data set it
-        # totally bogged things down instead of helping...
-        # query = query\
-        #     .options(orm.joinedload(model.Product.brand))\
-        #     .options(orm.joinedload(model.Product.department))\
-        #     .options(orm.joinedload(model.Product.subdepartment))\
-        #     .options(orm.joinedload(model.Product.regular_price))\
-        #     .options(orm.joinedload(model.Product.current_price))\
-        #     .options(orm.joinedload(model.Product.vendor))
-
+        # TODO: surely this is not always needed
         query = query.outerjoin(model.ProductInventory)
 
         return query
@@ -1190,6 +1175,7 @@ class ProductView(MasterView):
         return jsdata
 
     def template_kwargs_view(self, **kwargs):
+        kwargs = super(ProductView, self).template_kwargs_view(**kwargs)
         product = kwargs['instance']
         use_buefy = self.get_use_buefy()