Created
March 3, 2023 23:50
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Fastapi, Pydantic, Sqlalchemy List filter, order, limit model
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| from typing import List, Optional | |
| from accentdatabase.session import get_session | |
| from fastapi import Depends, Query | |
| from pydantic import BaseModel, Field | |
| from sqlalchemy import func, or_, select | |
| from sqlalchemy.ext.asyncio import AsyncSession | |
| from models import Model | |
| class ListFilter(BaseModel): | |
| """ | |
| usage: | |
| ?search=foo | |
| ?search=foo&search=bar | |
| ?limit=100 | |
| ?search=foo&limit=100 | |
| ordering is by the searched fields in order for simplicity only | |
| """ | |
| limit: int = 200 | |
| search: Optional[List[str]] = Field(Query([])) | |
| @property | |
| def search_regex(self): | |
| q = "".join(map(lambda s: f"(?=.*{s})", self.search)) | |
| return f"{q}.*" | |
| def prepare(self, statement, *search_field): | |
| if len(self.search) > 0: | |
| terms = map(lambda f: f.op("~*")(self.search_regex), search_field) | |
| statement = statement.filter(or_(*terms)) | |
| return statement.limit(self.limit).order_by(*search_field) | |
| @router.get("", response_model=List[ModelRead]) | |
| async def get_items( | |
| filters: ListFilter = Depends(), | |
| session: AsyncSession = Depends(get_session), | |
| ): | |
| qs = filters.prepare(select(Model), Model.name, Model.title) | |
| return list(await session.scalars(qs)) |
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