⚡ templates: `list_filter` custom tag - improve performance for json_sections

1 files changed, 8 insertions, 0 deletions

diff --git a/ishtar_common/models_common.py b/ishtar_common/models_common.py
index a94eadb80..10c564024 100644
--- a/ishtar_common/models_common.py
+++ b/ishtar_common/models_common.py
@@ -1339,6 +1339,8 @@ class JsonData(models.Model, CachedGen):
 
     @property
     def json_sections(self):
+        if getattr(self, "__json_sections", None):
+            return self.__json_sections
         sections = []
         try:
             content_type = ContentType.objects.get_for_model(self)
@@ -1382,6 +1384,12 @@ class JsonData(models.Model, CachedGen):
                 # if section name is identical it is the same
                 sections.append((section_name, []))
             sections[-1][1].append((field.name, value))
+        # clean
+        sections = [
+            (label or "", section) for label, section in sections
+            if any(1 for __, value in section if value)
+        ]
+        self.__json_sections = sections
         return sections
 
     @classmethod