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apps/api/app/modules/zootech/lab/calc/racion/tables.py

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+"""Загрузка справочников норм RACION (БД → JSON fallback)."""
+
+from __future__ import annotations
+
+import json
+from functools import lru_cache
+from pathlib import Path
+
+_SEED_DIR = Path(__file__).resolve().parents[4] / "data" / "seed" / "racion"
+
+
+def _read_json(name: str) -> dict:
+    path = _SEED_DIR / name
+    if not path.exists():
+        raise FileNotFoundError(f"Справочник не найден: {path}")
+    return json.loads(path.read_text(encoding="utf-8"))
+
+
+def _load_from_db(loader_name: str) -> dict | None:
+    try:
+        from flask import has_app_context
+
+        if not has_app_context():
+            return None
+        from app.modules.zootech.lab.services.racion_reference import (
+            load_moskwa_lactir_from_db,
+            load_normy_info_from_db,
+            load_piter_lactir_from_db,
+        )
+
+        loaders = {
+            "moskwa": load_moskwa_lactir_from_db,
+            "piter": load_piter_lactir_from_db,
+            "info": load_normy_info_from_db,
+        }
+        fn = loaders.get(loader_name)
+        if fn is None:
+            return None
+        data = fn()
+        return data if data else None
+    except Exception:
+        return None
+
+
+@lru_cache(maxsize=1)
+def load_moskwa_lactir() -> dict:
+    data = _load_from_db("moskwa")
+    if data:
+        return data
+    return _read_json("moskwa_lactir.json")
+
+
+@lru_cache(maxsize=1)
+def load_piter_lactir() -> dict:
+    data = _load_from_db("piter")
+    if data:
+        return data
+    return _read_json("piter_lactir.json")
+
+
+@lru_cache(maxsize=1)
+def load_normy_info() -> dict:
+    data = _load_from_db("info")
+    if data:
+        return data
+    try:
+        return _read_json("normy_info.json")
+    except FileNotFoundError:
+        return {"rows": [], "mass_kg_values": [400, 450, 500, 550, 600, 650, 700, 750]}
+
+
+def clear_tables_cache() -> None:
+    load_moskwa_lactir.cache_clear()
+    load_piter_lactir.cache_clear()
+    load_normy_info.cache_clear()