Add AppHandler methods to get/save/delete settings

rattail/app.py

@@ -71,6 +71,8 @@ class AppHandler(object):
         'vendors': 'rattail.autocomplete.vendors:VendorAutocompleter',
     }
 
+    setting_utctime_format = '%Y-%m-%d %H:%M:%S'
+
     def __init__(self, config):
         self.config = config
 
@@ -199,6 +201,40 @@ class AppHandler(object):
         value = session.execute(sql).scalar()
         return value
 
+    def get_setting(self, session, name, typ=None, **kwargs):
+        model = self.model
+        setting = session.query(model.Setting).get(name)
+        value = None if setting is None else setting.value
+
+        if typ == 'utctime':
+            if value:
+                value = datetime.datetime.strptime(value, self.setting_utctime_format)
+            else:
+                value = None
+
+        return value
+
+    def save_setting(self, session, name, value, typ=None, **kwargs):
+        model = self.model
+
+        if typ == 'utctime':
+            if value:
+                value = value.strftime(self.setting_utctime_format)
+            else:
+                value = None
+
+        setting = session.query(model.Setting).get(name)
+        if not setting:
+            setting = model.Setting(name=name)
+            session.add(setting)
+        setting.value = value
+
+    def delete_setting(self, session, name, **kwargs):
+        model = self.model
+        setting = session.query(model.Setting).get(name)
+        if setting:
+            session.delete(setting)
+
     def get_active_stores(self, session, **kwargs):
         """
         Returns the list of "active" stores.  A store is considered