mirror of
https://github.com/fastapi-practices/fastapi_best_architecture.git
synced 2025-08-14 19:04:00 +08:00
73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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from decimal import Decimal
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from typing import Any, Sequence, TypeVar
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from fastapi.encoders import decimal_encoder
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from msgspec import json
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from sqlalchemy import Row, RowMapping
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from sqlalchemy.orm import ColumnProperty, SynonymProperty, class_mapper
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from starlette.responses import JSONResponse
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RowData = Row | RowMapping | Any
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R = TypeVar('R', bound=RowData)
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def select_columns_serialize(row: R) -> dict[str, Any]:
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"""
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序列化 SQLAlchemy 查询表的列，不包含关联列
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:param row: SQLAlchemy 查询结果行
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:return:
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"""
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result = {}
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for column in row.__table__.columns.keys():
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value = getattr(row, column)
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if isinstance(value, Decimal):
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value = decimal_encoder(value)
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result[column] = value
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return result
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def select_list_serialize(row: Sequence[R]) -> list[dict[str, Any]]:
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"""
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序列化 SQLAlchemy 查询列表
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:param row: SQLAlchemy 查询结果列表
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:return:
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"""
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return [select_columns_serialize(item) for item in row]
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def select_as_dict(row: R, use_alias: bool = False) -> dict[str, Any]:
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"""
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将 SQLAlchemy 查询结果转换为字典，可以包含关联数据
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:param row: SQLAlchemy 查询结果行
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:param use_alias: 是否使用别名作为列名
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:return:
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"""
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if not use_alias:
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result = row.__dict__
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if '_sa_instance_state' in result:
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del result['_sa_instance_state']
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else:
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result = {}
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mapper = class_mapper(row.__class__) # type: ignore
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for prop in mapper.iterate_properties:
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if isinstance(prop, (ColumnProperty, SynonymProperty)):
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key = prop.key
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result[key] = getattr(row, key)
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return result
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class MsgSpecJSONResponse(JSONResponse):
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"""
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使用高性能的 msgspec 库将数据序列化为 JSON 的响应类
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"""
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def render(self, content: Any) -> bytes:
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return json.encode(content)
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