ref: use http error types in place of raw numbers

backend/src/main.py

@@ -3,7 +3,7 @@ from re import IGNORECASE, sub as substitute
 from typing import List, Optional
 from urllib.parse import unquote_plus
 
-from fastapi import Depends, FastAPI, File, HTTPException, UploadFile
+from fastapi import Depends, FastAPI, File, HTTPException, UploadFile, status
 from sqlalchemy.orm import Session
 
 from . import crud, models, schemas, spreadsheet
@@ -58,7 +58,7 @@ def create_items(file: UploadFile = File(...), db: Session = Depends(get_db)):
             )
             if unknown_headers:
                 raise HTTPException(
-                    status_code=422,
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
                     detail="Unknown headers in the spreadsheet: {}. Missing headers from the database: {}. Check the coordinated format".format(
                         unknown_headers, missing_headers
                     ),
@@ -81,11 +81,13 @@ def create_items(file: UploadFile = File(...), db: Session = Depends(get_db)):
 
     except spreadsheet.InvalidFileException:
         raise HTTPException(
-            status_code=422, detail="Invalid file upload (expected .xlsx)"
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Invalid file upload (expected .xlsx)",
         )
     except spreadsheet.DataInUnnamedColumnException:
         raise HTTPException(
-            status_code=422, detail="Data is found in a column with empty header"
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Data is found in a column with empty header",
         )
 
     return schemas.InsertStatus(
@@ -105,7 +107,9 @@ def read_item(item_id: int, db: Session = Depends(get_db)):
     """индивидуальные страницы для каждого Описания набора данных"""
     db_item = crud.get_item(db=db, item_id=item_id)
     if db_item is None:
-        raise HTTPException(status_code=404, detail="Item not found")
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Item not found"
+        )
     return db_item
 
 
@@ -149,7 +153,9 @@ def search(q: str, skip: int = 0, limit: int = 20, db: Session = Depends(get_db)
     # replace all full ИЛИ words with OR
     q = substitute(r"\bИЛИ\b", "OR", q, flags=IGNORECASE)
     if len(q) < 3:
-        raise HTTPException(status_code=400, detail="Query too short")
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Query too short"
+        )
     return crud.get_item_by_description(db=db, needle=q, skip=skip, limit=limit)