refactor!: map BigInteger to new BigInt scalar (#101)

* fix: map BigInteger to a new Int64 custom scalar

* docs: update readme

* docs: add RELEASE.md file

* fix: rename Int64 to BigInt

---------

Authored by: Ido Slonimsky <[email protected]>

README.md

@@ -136,7 +136,7 @@ Natively supports the following SQLAlchemy types:
 ```python
 Integer: int,
 Float: float,
-BigInteger: int,
+BigInteger: BigInt,
 Numeric: Decimal,
 DateTime: datetime,
 Date: date,

RELEASE.md

@@ -0,0 +1,3 @@
+Release type: patch
+
+This change implements a new custom scalar `BigInt` that is mapped to SQLAlchemy's `BigInteger`.

src/strawberry_sqlalchemy_mapper/mapper.py

@@ -93,6 +93,7 @@
     resolve_model_node,
     resolve_model_nodes,
 )
+from strawberry_sqlalchemy_mapper.scalars import BigInt
 
 if TYPE_CHECKING:
     from sqlalchemy.sql.expression import ColumnElement
@@ -193,7 +194,7 @@ class StrawberrySQLAlchemyMapper(Generic[BaseModelType]):
     ] = {
         Integer: int,
         Float: float,
-        BigInteger: int,
+        BigInteger: BigInt,
         Numeric: Decimal,
         DateTime: datetime,
         Date: date,
@@ -353,6 +354,8 @@ def _convert_column_to_strawberry_type(
             if item_type is SkipTypeSentinel:
                 return item_type
             type_annotation = List[item_type]  # type: ignore
+        elif isinstance(column.type, BigInteger):
+            type_annotation = BigInt
         else:
             for (
                 sqlalchemy_type,

src/strawberry_sqlalchemy_mapper/scalars.py

@@ -0,0 +1,10 @@
+from typing import Union
+
+import strawberry
+
+BigInt = strawberry.scalar(
+    Union[int, str],  # type: ignore
+    serialize=lambda v: int(v),
+    parse_value=lambda v: str(v),
+    description="BigInt field",
+)