mirror of https://github.com/langgenius/dify.git
67 lines
1.7 KiB
Python
67 lines
1.7 KiB
Python
from datetime import datetime
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from uuid import uuid4
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from sqlalchemy import DateTime, func
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from sqlalchemy.orm import DeclarativeBase, Mapped, MappedAsDataclass, mapped_column
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from libs.datetime_utils import naive_utc_now
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from libs.uuid_utils import uuidv7
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from .engine import metadata
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from .types import StringUUID
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class Base(DeclarativeBase):
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metadata = metadata
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class TypeBase(MappedAsDataclass, DeclarativeBase):
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"""
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This is for adding type, after all finished, rename to Base.
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"""
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metadata = metadata
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class DefaultFieldsMixin:
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id: Mapped[str] = mapped_column(
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StringUUID,
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primary_key=True,
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# NOTE: The default serve as fallback mechanisms.
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# The application can generate the `id` before saving to optimize
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# the insertion process (especially for interdependent models)
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# and reduce database roundtrips.
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default=lambda: str(uuidv7()),
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)
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created_at: Mapped[datetime] = mapped_column(
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DateTime,
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nullable=False,
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default=naive_utc_now,
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server_default=func.current_timestamp(),
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)
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updated_at: Mapped[datetime] = mapped_column(
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DateTime,
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nullable=False,
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default=naive_utc_now,
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server_default=func.current_timestamp(),
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onupdate=func.current_timestamp(),
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)
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__}(id={self.id})>"
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def gen_uuidv4_string() -> str:
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"""gen_uuidv4_string generate a UUIDv4 string.
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NOTE: This function exists only for historical reasons. New models should use uuidv7 for primary key generation.
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"""
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return str(uuid4())
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def gen_uuidv7_string() -> str:
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"""gen_uuidv4_string generate a UUIDv4 string."""
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return str(uuidv7())
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