Update settings API endpoints: (#5684)

* Update settings API endpoints:

- Use cache to prevent unnecessary hits to db
- Make settings detail endpoints case insensitive
- Update API version

* Remove is_admin and is_superuser

- Contaminated from other commit

* revert seralizers.py

* Revert breaking change to users/api.py

InvenTree/common/api.py

@@ -229,9 +229,9 @@ class GlobalSettingsDetail(RetrieveUpdateAPI):
 
     def get_object(self):
         """Attempt to find a global setting object with the provided key."""
-        key = self.kwargs['key']
+        key = str(self.kwargs['key']).upper()
 
-        if key not in common.models.InvenTreeSetting.SETTINGS.keys():
+        if key.startswith('_') or key not in common.models.InvenTreeSetting.SETTINGS.keys():
             raise NotFound()
 
         return common.models.InvenTreeSetting.get_setting_object(
@@ -296,9 +296,9 @@ class UserSettingsDetail(RetrieveUpdateAPI):
 
     def get_object(self):
         """Attempt to find a user setting object with the provided key."""
-        key = self.kwargs['key']
+        key = str(self.kwargs['key']).upper()
 
-        if key not in common.models.InvenTreeUserSetting.SETTINGS.keys():
+        if key.startswith('_') or key not in common.models.InvenTreeUserSetting.SETTINGS.keys():
             raise NotFound()
 
         return common.models.InvenTreeUserSetting.get_setting_object(

InvenTree/common/models.py

@@ -205,6 +205,12 @@ class BaseInvenTreeSetting(models.Model):
         If a particular setting is not present, create it with the default value
         """
 
+        cache_key = f"BUILD_DEFAULT_VALUES:{str(cls.__name__)}"
+
+        if InvenTree.helpers.str2bool(cache.get(cache_key, False)):
+            # Already built default values
+            return
+
         try:
             existing_keys = cls.objects.filter(**kwargs).values_list('key', flat=True)
             settings_keys = cls.SETTINGS.keys()
@@ -224,6 +230,8 @@ class BaseInvenTreeSetting(models.Model):
             logger.exception("Failed to build default values for %s (%s)", str(cls), str(type(exc)))
             pass
 
+        cache.set(cache_key, True, timeout=3600)
+
     def _call_settings_function(self, reference: str, args, kwargs):
         """Call a function associated with a particular setting.
 
@@ -1241,7 +1249,7 @@ class InvenTreeSetting(BaseInvenTreeSetting):
 
         'BARCODE_ENABLE': {
             'name': _('Barcode Support'),
-            'description': _('Enable barcode scanner support'),
+            'description': _('Enable barcode scanner support in the web interface'),
             'default': True,
             'validator': bool,
         },

InvenTree/common/serializers.py

@@ -51,6 +51,8 @@ class SettingsSerializer(InvenTreeModelSerializer):
 
     value = SettingsValueField()
 
+    units = serializers.CharField(read_only=True)
+
     def get_choices(self, obj):
         """Returns the choices available for a given item."""
         results = []
@@ -81,6 +83,7 @@ class GlobalSettingsSerializer(SettingsSerializer):
             'name',
             'description',
             'type',
+            'units',
             'choices',
             'model_name',
             'api_url',
@@ -103,6 +106,7 @@ class UserSettingsSerializer(SettingsSerializer):
             'description',
             'user',
             'type',
+            'units',
             'choices',
             'model_name',
             'api_url',