jsondatastore: optimize SQL queries (#68620)

- sort only when needed
- filter on PG side to reduce network usage (and allow for indexing later if needed)

passerelle/apps/jsondatastore/models.py

@@ -52,9 +52,6 @@ class JsonData(models.Model):
     creation_datetime = models.DateTimeField(auto_now_add=True)
     last_update_datetime = models.DateTimeField(auto_now=True)
 
-    class Meta:
-        ordering = ['text']
-
     def save(self, *args, **kwargs):
         text_value_template = self.datastore.text_value_template
         if text_value_template:
@@ -95,7 +92,7 @@ class JsonDataStore(BaseResource):
         },
     )
     def list(self, request, name_id=None, q=None, **kwargs):
-        objects = JsonData.objects.filter(datastore=self)
+        objects = JsonData.objects.filter(datastore=self).order_by('text')
         if name_id is not None:
             objects = objects.filter(name_id=name_id)
         if q:
@@ -186,7 +183,8 @@ class JsonDataStore(BaseResource):
         objects = JsonData.objects.filter(datastore=self)
         if name_id is not None:
             objects = objects.filter(name_id=name_id)
-        for data in objects:
-            if data.content and data.content.get(attribute) == value:
-                return data.to_json()
+        objects = objects.filter(content__contains={attribute: value})
+        data = objects.first()
+        if data is not None:
+            return data.to_json()
         raise APIError('no such object')