130 lines
5.1 KiB
Python
130 lines
5.1 KiB
Python
from sqlalchemy import (BigInteger, Boolean, Column, Integer, DECIMAL, String, LargeBinary)
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from sqlalchemy.orm import relationship
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from models.base import AuditBase, IdBase
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class Blog(AuditBase):
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title = Column(String(255), nullable=False, comment="博客标题")
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top_value = Column(Integer, nullable=False, default=0, comment="置顶值 越大越靠前")
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is_great = Column(Boolean, nullable=False, default=False, comment="是否是精品")
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category_id = Column(BigInteger, nullable=False, comment="博客类别")
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summary = Column(String(255), nullable=False, comment="博客内容概要")
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content_id = Column(BigInteger, nullable=False, comment="博客内容")
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word_count = Column(Integer, nullable=False, default=0, comment="字数统计")
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read_duration = Column(DECIMAL(10, 2), nullable=False, default=0.00, comment="阅读时长")
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is_approved = Column(Boolean, nullable=False, default=False, comment="是否发布")
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# 分类关系（多对一）
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category = relationship(
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"BlogCategory",
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# 与BlogCategory的blogs属性建立双向关系
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back_populates="blogs",
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# 只级联保存和合并操作，不级联删除（删除博客不应删除分类
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cascade="save-update, merge",
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# 明确指定连接条件
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# 如果数据库设置了外键可以省略
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primaryjoin="foreign(Blog.category_id) == BlogCategory.id"
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)
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# 内容关系（一对一）
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content = relationship(
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"BlogContent",
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# 与BlogContent的blog属性建立双向关系
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back_populates="blog",
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# 完全级联操作：保存、合并、刷新、删除等所有操作都会级联
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cascade="all, delete-orphan",
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# 设置为False表示一对一关系，返回单个对象而不是列表
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uselist=False,
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# 确保内容只有一个父博客，与delete-orphan配合使用
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single_parent=True,
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# 明确指定连接条件
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primaryjoin="foreign(Blog.content_id) == BlogContent.id"
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)
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# 访问记录（一对多）
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visits = relationship(
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"BlogVisit",
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# 与BlogVisit的blog属性建立双向关系
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back_populates="blog",
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# 完全级联操作：博客删除时自动删除所有访问记录
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cascade="all, delete-orphan",
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# 明确指定连接条件
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primaryjoin="Blog.id == foreign(BlogVisit.blog_id)"
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)
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# 4. 评论（一对多）
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comments = relationship(
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"BlogComment",
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# 与BlogComment的blog属性建立双向关系
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back_populates="blog",
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# 完全级联操作：博客删除时自动删除所有评论
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cascade="all, delete-orphan",
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# 明确指定连接条件
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primaryjoin="Blog.id == foreign(BlogComment.blog_id)"
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)
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class BlogCategory(AuditBase):
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name = Column(String(45), nullable=False, comment="类别名称")
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blogs = relationship(
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"Blog",
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# 与Blog的category属性建立双向关系
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back_populates="category",
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# 完全级联操作：分类删除时自动删除所有关联的博客
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# 警告：这会级联删除分类下的所有博客，包括博客的内容、访问记录和评论
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cascade="all, delete-orphan",
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# 明确指定连接条件
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primaryjoin="BlogCategory.id == foreign(Blog.category_id)"
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)
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class BlogContent(IdBase):
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content = Column(LargeBinary, nullable=False, comment="博客内容")
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blog = relationship(
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"Blog",
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# 与Blog的content属性建立双向关系
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back_populates="content",
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# 设置为False表示一对一关系
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uselist=False,
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# 明确指定连接条件
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primaryjoin="BlogContent.id == foreign(Blog.content_id)"
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)
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class BlogVisit(AuditBase):
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ip = Column(String(255), nullable=False, comment="IP地址")
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os = Column(String(255), nullable=False, comment="操作系统")
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browser = Column(String(255), nullable=False, comment="浏览器")
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uri = Column(String(255), nullable=False, comment="路径")
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blog_id = Column(BigInteger, nullable=True, comment="博客ID")
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blog = relationship(
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"Blog",
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# 与Blog的visits属性建立双向关系
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back_populates="visits",
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# 明确指定连接条件
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primaryjoin="foreign(BlogVisit.blog_id) == Blog.id"
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)
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class BlogComment(AuditBase):
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blog_id = Column(BigInteger, nullable=False, comment="博客ID")
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parent_id = Column(BigInteger, nullable=False, comment="父评论ID")
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name = Column(String(255), nullable=False, comment="评论人昵称")
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website = Column(String(255), nullable=True, comment="评论人网站")
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ip_address = Column(String(45), nullable=False, comment="评论人IP")
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user_agent = Column(String(255), nullable=False, comment="评论人浏览器信息")
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content = Column(String(255), nullable=False, comment="评论内容")
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is_approved = Column(Boolean, nullable=False, default=False, comment="是否通过")
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blog = relationship(
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"Blog",
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# 与Blog的comments属性建立双向关系
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back_populates="comments",
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# 明确指定连接条件
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primaryjoin="foreign(BlogComment.blog_id) == Blog.id"
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)
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