feat: deals filters

utils/sorting.py

@@ -0,0 +1,21 @@
+from typing import Optional
+
+from fastapi import Query
+from sqlalchemy import Select
+
+from schemas.base import SortingSchema, SortDir
+from utils.strings import camel_to_snake
+
+
+async def sorting_parameters(
+    field: Optional[str] = Query(default=None, alias="sortingField"),
+    direction: Optional[SortDir] = Query(default=None, alias="sortingDirection"),
+) -> SortingSchema:
+    return SortingSchema(field=camel_to_snake(field), direction=direction)
+
+
+def apply_sorting(stmt: Select, cls: type, field: str, direction: SortDir) -> Select:
+    attr = getattr(cls, field)
+    if direction == "asc":
+        return stmt.order_by(attr.asc())
+    return stmt.order_by(attr.desc())

utils/strings.py

@@ -0,0 +1,8 @@
+import re
+from typing import Optional
+
+
+def camel_to_snake(string: Optional[str]) -> str:
+    if not string:
+        return string
+    return re.sub(r"(?<!^)(?=[A-Z])", "_", string).lower()