Improve user form handling, to prevent unwanted Person creation

i.e. only create new person if name(s) were provided

tailbone/views/users.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.
 #
@@ -63,9 +63,9 @@ class UsersView(PrincipalMasterView):
     form_fields = [
         'username',
         'person',
-        'first_name',
+        'first_name_',
-        'last_name',
+        'last_name_',
-        'display_name',
+        'display_name_',
         'active',
         'active_sticky',
         'set_password',
@@ -170,6 +170,18 @@ class UsersView(PrincipalMasterView):
                     field_display=person_display, service_url=people_url))
                 f.set_label('person_uuid', "Person")
 
+        # person name(s)
+        if self.editing:
+            # must explicitly set default, for "custom" field names
+            f.set_default('first_name_', user.first_name or "")
+            f.set_default('last_name_', user.last_name or "")
+            f.set_default('display_name_', user.display_name or "")
+        elif not self.creating:
+            # must provide custom renderer as well
+            f.set_renderer('first_name_', self.render_person_name)
+            f.set_renderer('last_name_', self.render_person_name)
+            f.set_renderer('display_name_', self.render_person_name)
+
         # set_password
         f.set_widget('set_password', dfwidget.CheckedPasswordWidget())
         # if self.creating:
@@ -218,10 +230,38 @@ class UsersView(PrincipalMasterView):
                            .order_by(model.Role.name)
 
     def objectify(self, form, data):
+
+        # create/update user as per normal
+        if data is None:
+            data = form.validated
         user = super(UsersView, self).objectify(form, data)
+
+        # create/update person as needed
+        names = {}
+        if 'first_name_' in form:
+            names['first'] = data['first_name_']
+        if 'last_name_' in form:
+            names['last'] = data['last_name_']
+        if 'display_name_' in form:
+            names['display'] = data['display_name_']
+        # note, do *not* create new person unless name(s) provided
+        if not user.person and any([n for n in names.values()]):
+            user.person = model.Person()
+        if user.person:
+            if 'first' in names:
+                user.person.first_name = names['first']
+            if 'last' in names:
+                user.person.last_name = names['last']
+            if 'display' in names:
+                user.person.display_name = names['display']
+
+        # maybe set user password
         if data['set_password']:
             set_user_password(user, data['set_password'])
+
+        # update roles for user
         self.update_roles(user, data)
+
         return user
 
     def update_roles(self, user, data):
@@ -243,6 +283,14 @@ class UsersView(PrincipalMasterView):
         url = self.request.route_url('people.view', uuid=person.uuid)
         return tags.link_to(person, url)
 
+    def render_person_name(self, user, field):
+        if not field.endswith('_'):
+            return ""
+        name = getattr(user, field[:-1], None)
+        if not name:
+            return ""
+        return six.text_type(name)
+
     def render_roles(self, user, field):
         roles = user.roles
         items = []