Speed up loading by getting all favorite tags at once (BB-65)

boards/abstracts/settingsmanager.py

@@ -1,148 +1,146 b''
 from django.shortcuts import get_object_or_404
 from boards.models import Tag
 
 __author__ = 'neko259'
 
 SESSION_SETTING = 'setting'
 
 # Remove this, it is not used any more cause there is a user's permission
 PERMISSION_MODERATE = 'moderator'
 
 SETTING_THEME = 'theme'
 SETTING_FAVORITE_TAGS = 'favorite_tags'
 SETTING_HIDDEN_TAGS = 'hidden_tags'
 SETTING_PERMISSIONS = 'permissions'
 SETTING_USERNAME = 'username'
 SETTING_LAST_NOTIFICATION_ID = 'last_notification'
 
 DEFAULT_THEME = 'md'
 
 
 class SettingsManager:
     """
     Base settings manager class. get_setting and set_setting methods should
     be overriden.
     """
     def __init__(self):
         pass
 
     def get_theme(self):
         theme = self.get_setting(SETTING_THEME)
         if not theme:
             theme = DEFAULT_THEME
             self.set_setting(SETTING_THEME, theme)
 
         return theme
 
     def set_theme(self, theme):
         self.set_setting(SETTING_THEME, theme)
 
     def has_permission(self, permission):
         permissions = self.get_setting(SETTING_PERMISSIONS)
         if permissions:
             return permission in permissions
         else:
             return False
 
     def get_setting(self, setting):
         pass
 
     def set_setting(self, setting, value):
         pass
 
     def add_permission(self, permission):
         permissions = self.get_setting(SETTING_PERMISSIONS)
         if not permissions:
             permissions = [permission]
         else:
             permissions.append(permission)
         self.set_setting(SETTING_PERMISSIONS, permissions)
 
     def del_permission(self, permission):
         permissions = self.get_setting(SETTING_PERMISSIONS)
         if not permissions:
             permissions = []
         else:
             permissions.remove(permission)
         self.set_setting(SETTING_PERMISSIONS, permissions)
 
     def get_fav_tags(self):
         tag_names = self.get_setting(SETTING_FAVORITE_TAGS)
         tags = []
         if tag_names:
-            for tag_name in tag_names:
-                tag = get_object_or_404(Tag, name=tag_name)
-                tags.append(tag)
+            tags = Tag.objects.filter(name__in=tag_names)
         return tags
 
     def add_fav_tag(self, tag):
         tags = self.get_setting(SETTING_FAVORITE_TAGS)
         if not tags:
             tags = [tag.name]
         else:
             if not tag.name in tags:
                 tags.append(tag.name)
 
         tags.sort()
         self.set_setting(SETTING_FAVORITE_TAGS, tags)
 
     def del_fav_tag(self, tag):
         tags = self.get_setting(SETTING_FAVORITE_TAGS)
         if tag.name in tags:
             tags.remove(tag.name)
             self.set_setting(SETTING_FAVORITE_TAGS, tags)
 
     def get_hidden_tags(self):
         tag_names = self.get_setting(SETTING_HIDDEN_TAGS)
         tags = []
         if tag_names:
             for tag_name in tag_names:
                 tag = get_object_or_404(Tag, name=tag_name)
                 tags.append(tag)
 
         return tags
 
     def add_hidden_tag(self, tag):
         tags = self.get_setting(SETTING_HIDDEN_TAGS)
         if not tags:
             tags = [tag.name]
         else:
             if not tag.name in tags:
                 tags.append(tag.name)
 
         tags.sort()
         self.set_setting(SETTING_HIDDEN_TAGS, tags)
 
     def del_hidden_tag(self, tag):
         tags = self.get_setting(SETTING_HIDDEN_TAGS)
         if tag.name in tags:
             tags.remove(tag.name)
             self.set_setting(SETTING_HIDDEN_TAGS, tags)
 
 
 class SessionSettingsManager(SettingsManager):
     """
     Session-based settings manager. All settings are saved to the user's
     session.
     """
     def __init__(self, session):
         SettingsManager.__init__(self)
         self.session = session
 
     def get_setting(self, setting):
         if setting in self.session:
             return self.session[setting]
         else:
             return None
 
     def set_setting(self, setting, value):
         self.session[setting] = value
 
 
 def get_settings_manager(request) -> SettingsManager:
     """
     Get settings manager based on the request object. Currently only
     session-based manager is supported. In the future, cookie-based or
     database-based managers could be implemented.
     """
     return SessionSettingsManager(request.session)