WIP checkpoint: US-1: glTF Asset Upload with Metadata Extraction

backend/app/models/asset.py

@@ -3,6 +3,8 @@ from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 import enum
+import json
+from typing import Any, Optional
 
 from app.database import Base
 
@@ -38,3 +40,32 @@ class Asset(Base):
 
     owner = relationship("User", back_populates="assets")
     world = relationship("World", back_populates="assets")
+
+    # ------------------------------------------------------------------
+    # Computed properties
+    # ------------------------------------------------------------------
+
+    @property
+    def has_gltf_metadata(self) -> bool:
+        """Return True when metadata_json contains glTF-specific keys.
+
+        glTF metadata is considered present when the stored JSON contains at
+        least one of the keys that *extract_gltf_metadata* produces
+        (mesh_count, vertex_count, has_animation, texture_refs,
+        bounding_box_min, bounding_box_max).
+        """
+        if not self.metadata_json:
+            return False
+        try:
+            data: dict[str, Any] = json.loads(self.metadata_json)
+        except (json.JSONDecodeError, TypeError):
+            return False
+        gltf_keys = {
+            "mesh_count",
+            "vertex_count",
+            "has_animation",
+            "texture_refs",
+            "bounding_box_min",
+            "bounding_box_max",
+        }
+        return bool(gltf_keys & data.keys())