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storage.py
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storage.py
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from typing import List
from typing import Optional
from sqlalchemy import ForeignKey, String, Text
from sqlalchemy.orm import Mapped, relationship
from sqlalchemy.orm import mapped_column
from sqlalchemy.orm import DeclarativeBase
from sqlalchemy.orm import Session
from sqlalchemy.exc import IntegrityError
from sqlalchemy import select
class Storage:
def store_all(self, engine, projects):
with Session(engine) as session:
for project in projects:
session.add(project)
try:
session.commit()
except IntegrityError:
session.rollback()
def read_all(self, engine):
with Session(engine) as session:
projects = select(Project)
return session.scalars(projects)
class Base(DeclarativeBase):
pass
class Project(Base):
__tablename__ = "projects"
id: Mapped[int] = mapped_column(primary_key=True)
title: Mapped[str] = mapped_column(Text)
url: Mapped[str] = mapped_column(Text, unique=True)
description: Mapped[Optional[str]]
posted_date: Mapped[Optional[int]]
deadline: Mapped[Optional[int]]
expected_time_limit: Mapped[Optional[int]]
price_fixed: Mapped[Optional[float]]
price_fixed_min: Mapped[Optional[float]]
price_hourly: Mapped[Optional[float]]
price_hourly_min: Mapped[Optional[float]]
tags: Mapped[List["Tag"]] = relationship(
back_populates="project", cascade="all, delete-orphan")
class Tag(Base):
__tablename__ = "tags"
id: Mapped[int] = mapped_column(primary_key=True)
name: Mapped[str] = mapped_column(String(30))
project_id: Mapped[int] = mapped_column(ForeignKey("projects.id"))
project: Mapped["Project"] = relationship( back_populates="tags")