mirror of
https://github.com/beak-insights/felicity-lims.git
synced 2025-02-25 01:13:01 +08:00
411 lines
14 KiB
Python
411 lines
14 KiB
Python
from typing import Any, AsyncIterator, Generic, List, Optional, TypeVar
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from sqlalchemy import inspect, or_ as sa_or_
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from sqlalchemy import select, update
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from sqlalchemy.orm import selectinload
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from sqlalchemy.sql import func
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from sqlalchemy.sql.expression import bindparam
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from felicity.apps.common.utils.serializer import marshaller
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from felicity.database.paging import EdgeNode, PageCursor, PageInfo
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from felicity.database.session import async_session
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from felicity.apps.abstract.entity import BaseEntity
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M = TypeVar("M", bound=BaseEntity)
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def apply_nested_loader_options(stmt, model, path):
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"""
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Applies loader options to nested relationships based on a dot-separated path.
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:param stmt: The SQLAlchemy query object.
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:param model: The base model from which to start applying loader options.
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:param path: A dot-separated string representing the nested relationship path.
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:param loader_option: The loader option function (e.g., selectinload, joinedload).
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:return: The modified query with loader options applied to nested relationships.
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select(Order).options(
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selectinload(Order.items).selectinload(Item.keywords)
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)
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"""
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load_option = None
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current_model = model
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for attr in path.split("."):
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if load_option is None:
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load_option = selectinload(getattr(current_model, attr))
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current_option = load_option
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else:
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next_option = selectinload(getattr(current_model, attr))
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current_option = current_option.options(next_option)
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current_option = next_option
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# Update the current model to the next model in the relationship path
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current_model = inspect(current_model).relationships[attr].mapper.class_
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return stmt.options(load_option)
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class BaseRepository(Generic[M]):
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async_session = async_session
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model: M = None
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def __init__(self, model: M) -> None:
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self.model = model
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async def save(self, m: M) -> M:
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async with self.async_session() as session:
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try:
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session.add(m)
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# try:
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# session.add(m)
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# except Exception:
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# await session.merge(m)
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await session.flush()
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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return m
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async def save_all(self, items):
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async with self.async_session() as session:
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try:
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session.add_all(items)
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await session.flush()
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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return items
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async def create(self, **kwargs) -> M:
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filled = self.model.fill(self.model(), **kwargs)
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return await self.save(filled)
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async def bulk_create(self, bulk: list[dict]) -> list[M]:
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to_save = []
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for data in bulk:
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fill = self.model.fill(self.model(), **data)
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to_save.append(fill)
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return await self.save_all(to_save)
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async def update(self, uid: str, **data) -> M:
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item = await self.get(uid=uid)
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filled = self.model.fill(item, **data)
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return await self.save(filled)
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async def bulk_update_where(self, update_data: list[dict], filters: dict):
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"""
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@param update_data a List of dictionary update values.
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@param filters is a dict of filter values.
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e.g [{'uid': 34, update_values}, ...]
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"""
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query = self.model.smart_query(query=update(self.model), filters=filters)
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stmt = query.values(update_data).execution_options(synchronize_session="fetch")
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async with self.async_session() as session:
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results = await session.execute(stmt)
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updated = results.scalars().all()
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return updated
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async def bulk_update_with_mappings(self, mappings: list) -> None:
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"""
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@param mappings a List of dictionary update values with pks.
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e.g [{'uid': 34, update_values}, ...]
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?? there must be zero many-to-many relations
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NB: Function does not return anything
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"""
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if len(mappings) == 0:
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return
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to_update = mappings # [marshaller(data) for data in mappings]
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for item in to_update:
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item["_uid"] = item["uid"]
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query = update(self.model).where(self.model.uid == bindparam("_uid"))
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binds = {}
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for key in to_update[0]:
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if key != "_uid":
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binds[key] = bindparam(key)
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stmt = query.values(binds).execution_options(
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synchronize_session=None
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) # "fetch" not available
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async with self.async_session() as session:
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await session.execute(stmt, to_update)
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await session.flush()
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await session.commit()
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async def table_insert(self, table: Any, mappings: list[dict]) -> None:
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"""
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@param table is a sqlalchemy table model
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@param mappings a dictionary update values.
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e.g {'name': 34, 'day': "fff"}
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"""
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async with self.async_session() as session:
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stmt = table.insert()
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await session.execute(stmt, mappings)
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await session.commit()
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await session.flush()
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async def query_table(self, table, **kwargs):
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stmt = select(table)
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for k, v in kwargs.items():
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stmt = stmt.where(table.c[k] == v)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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return results.unique().scalars().all() # , results.keys()
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async def get(self, **kwargs) -> M:
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stmt = self.model.where(**kwargs)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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found = results.scalars().first()
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return found
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async def get_all(self, **kwargs) -> list[M]:
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stmt = self.model.where(**kwargs)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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found = results.scalars().all()
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return found
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async def all(self) -> list[M]:
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async with self.async_session() as session:
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results = await session.execute(select(self.model))
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return results.scalars().all()
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async def all_by_page(self, page: int = 1, limit: int = 20, **kwargs) -> dict:
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start = (page - 1) * limit
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stmt = self.model.where(**kwargs).limit(limit).offset(start)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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found = results.scalars().all()
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return found
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async def get_by_uids(self, uids: List[str]) -> list[M]:
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stmt = select(self.model).where(self.model.uid.in_(uids)) # type: ignore
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async with self.async_session() as session:
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results = await session.execute(stmt.order_by(self.model.uid))
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return results.scalars().all()
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async def get_related(
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self, related: Optional[list[str]] = None, many: bool = False, **kwargs
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):
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"""Return the first value in database based on given args."""
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try:
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del kwargs["related"]
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except KeyError:
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pass
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try:
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del kwargs["many"]
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except KeyError:
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pass
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stmt = self.model.where(**kwargs)
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if related:
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for key in related:
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stmt = stmt.options(selectinload(getattr(self.model, key)))
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async with self.async_session() as session:
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results = await session.execute(stmt)
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if not many:
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found = results.scalars().first()
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else:
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found = results.scalars().all()
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return found
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async def stream_by_uids(self, uids: List[Any]) -> AsyncIterator[M]:
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stmt = select(self.model).where(self.model.in_(uids)) # type: ignore
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async with self.async_session() as session:
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stream = await session.stream(stmt.order_by(self.model.uid))
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async for row in stream:
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yield row
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async def stream_all(self) -> AsyncIterator[Any]:
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stmt = select(self.model)
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async with self.async_session() as session:
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stream = await session.stream(stmt.order_by(self.model.uid))
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async for row in stream:
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yield row
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async def full_text_search(self, search_string, field):
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"""Full-text Search with PostgreSQL"""
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stmt = select(self.model).filter(
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func.to_tsvector("english", getattr(self.model, field)).match(
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search_string, postgresql_regconfig="english"
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)
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)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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search = results.scalars().all()
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return search
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async def delete(self, uid: str) -> None:
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obj = await self.get(uid=uid)
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async with self.async_session() as session:
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await session.delete(obj)
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await session.flush()
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await session.commit()
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async def count_where(self, filters: dict) -> int:
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"""
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:param filters:
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:return: int
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"""
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# filter_stmt = smart_query(query=select(self), filters=filters) noqa
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filter_stmt = self.model.smart_query(filters=filters)
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count_stmt = select(func.count(filter_stmt.c.uid)).select_from(filter_stmt)
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async with self.async_session() as session:
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res = await session.execute(count_stmt)
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return res.scalars().one()
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async def search(self, **kwargs) -> list[M]:
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filters = []
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combined = set()
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for k, v in kwargs:
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filter_string = f"{k}__ilike"
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filters.append(filter_string)
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arg = dict()
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arg[k] = f"%{v}%"
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query = await self.get_all(**arg)
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for item in query:
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combined.add(item)
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return list(combined)
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async def filter(
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self,
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filters: list[dict],
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sort_attrs: list[str] | None = None,
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limit: int | None = None,
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either: bool = False,
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) -> list[M]:
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if either:
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filters = {sa_or_: filters}
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stmt = self.model.smart_query(filters, sort_attrs)
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if limit:
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stmt = stmt.limit(limit)
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async with self.async_session() as session:
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results = await session.execute(stmt)
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found = results.scalars().all()
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return found
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async def paginate(
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self,
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page_size: int | None,
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after_cursor: str | None,
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before_cursor: str | None,
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filters: dict | list[dict] | None,
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sort_by: list[str] | None,
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**kwargs,
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) -> PageCursor:
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if not filters:
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filters = {}
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# get total count without paging filters from cursors
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total_count: int = await self.count_where(filters=filters)
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total_count = total_count if total_count else 0
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cursor_limit = {}
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if after_cursor:
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cursor_limit = {"uid__gt": self.decode_cursor(after_cursor)}
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if before_cursor:
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cursor_limit = {"uid__lt": self.decode_cursor(before_cursor)}
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# add paging filters
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_filters = None
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if isinstance(filters, dict):
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_filters = [{sa_or_: cursor_limit}, filters] if cursor_limit else filters
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elif isinstance(filters, list):
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_filters = filters
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if cursor_limit:
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_filters.append({sa_or_: cursor_limit})
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stmt = self.model.smart_query(filters=_filters, sort_attrs=sort_by)
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if kwargs.get("get_related"):
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for key in kwargs.get("get_related"):
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# stmt = stmt.options(selectinload(getattr(self.model, key)))
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stmt = apply_nested_loader_options(stmt, self.model, key)
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if page_size:
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stmt = stmt.limit(page_size)
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async with self.async_session() as session:
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res = await session.execute(stmt)
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qs = res.scalars().all()
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if qs is not None:
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items = qs
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else:
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qs = []
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items = []
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has_additional = (
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len(items) == page_size if page_size else True
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) # len(qs) > len(items)s
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page_info = {
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"start_cursor": self.encode_cursor(items[0].uid) if items else None,
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"end_cursor": self.encode_cursor(items[-1].uid) if items else None,
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}
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if page_size is not None:
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page_info["has_next_page"] = has_additional
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page_info["has_previous_page"] = bool(after_cursor)
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return PageCursor(
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**{
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"total_count": total_count,
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"edges": self.build_edges(items=items),
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"items": items,
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"page_info": self.build_page_info(**page_info),
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}
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)
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def build_edges(self, items: List[Any]) -> List[EdgeNode]:
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if not items:
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return []
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return [self.build_node(item) for item in items]
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def build_node(self, item: Any) -> EdgeNode:
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return EdgeNode(**{"cursor": self.encode_cursor(item.uid), "node": item})
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@staticmethod
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def build_page_info(
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start_cursor: str = None,
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end_cursor: str = None,
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has_next_page: bool = False,
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has_previous_page: bool = False,
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) -> PageInfo:
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return PageInfo(
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**{
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"start_cursor": start_cursor,
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"end_cursor": end_cursor,
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"has_next_page": has_next_page,
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"has_previous_page": has_previous_page,
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}
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)
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@staticmethod
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def decode_cursor(cursor):
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return cursor
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@staticmethod
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def encode_cursor(identifier: Any):
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return identifier
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