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QuerySet 预加载管理器
为核心 Model 提供带预加载配置的查询集工厂方法，
消除各 Service 中重复的 select_related/prefetch_related 定义。
"""
from __future__ import annotations
from typing import TYPE_CHECKING, Any
if TYPE_CHECKING:
from django.db.models import QuerySet
class CaseQuerySetManager:
"""案件查询集管理器"""
SELECT_RELATED: tuple[str, ...] = ("contract",)
PREFETCH_RELATED: tuple[str, ...] = (
"parties__client",
"assignments__lawyer",
"assignments__lawyer__law_firm",
"logs__attachments",
"case_numbers",
"supervising_authorities",
"contract__supplementary_agreements__parties__client",
)
@classmethod
def with_standard_prefetch(cls) -> QuerySet[Any, Any]:
"""返回带标准预加载的查询集"""
from django.apps import apps
from django.db.models import QuerySet as QS
Case = apps.get_model("cases", "Case")
qs: QS[Any] = Case.objects.select_related(*cls.SELECT_RELATED).prefetch_related(*cls.PREFETCH_RELATED)
return qs
@classmethod
def with_extra_prefetch(cls, *extra: str) -> QuerySet[Any, Any]:
"""返回带额外预加载的查询集"""
return cls.with_standard_prefetch().prefetch_related(*extra)
class ContractQuerySetManager:
"""合同查询集管理器"""
PREFETCH_RELATED: tuple[str, ...] = (
"cases",
"contract_parties__client",
"payments",
"reminders",
"assignments__lawyer",
"assignments__lawyer__law_firm",
)
@classmethod
def with_standard_prefetch(cls) -> QuerySet[Any, Any]:
"""返回带标准预加载的查询集"""
from django.apps import apps
from django.db.models import QuerySet as QS
Contract = apps.get_model("contracts", "Contract")
qs: QS[Any] = Contract.objects.prefetch_related(*cls.PREFETCH_RELATED)
return qs
@classmethod
def with_extra_prefetch(cls, *extra: str) -> QuerySet[Any, Any]:
"""返回带额外预加载的查询集"""
return cls.with_standard_prefetch().prefetch_related(*extra)
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