gallery.accords-library.com/server/szurubooru/model/comment.py

import sqlalchemy as sa
from szurubooru.db import get_session
from szurubooru.model.base import Base


class CommentScore(Base):
    __tablename__ = 'comment_score'

    comment_id = sa.Column(
        'comment_id',
        sa.Integer,
        sa.ForeignKey('comment.id'),
        nullable=False,
        primary_key=True)
    user_id = sa.Column(
        'user_id',
        sa.Integer,
        sa.ForeignKey('user.id'),
        nullable=False,
        primary_key=True,
        index=True)
    time = sa.Column('time', sa.DateTime, nullable=False)
    score = sa.Column('score', sa.Integer, nullable=False)

    comment = sa.orm.relationship('Comment')
    user = sa.orm.relationship(
        'User',
        backref=sa.orm.backref('comment_scores', cascade='all, delete-orphan'))


class Comment(Base):
    __tablename__ = 'comment'

    comment_id = sa.Column('id', sa.Integer, primary_key=True)
    post_id = sa.Column(
        'post_id',
        sa.Integer,
        sa.ForeignKey('post.id'),
        nullable=False,
        index=True)
    user_id = sa.Column(
        'user_id',
        sa.Integer,
        sa.ForeignKey('user.id'),
        nullable=True,
        index=True)
    version = sa.Column('version', sa.Integer, default=1, nullable=False)
    creation_time = sa.Column('creation_time', sa.DateTime, nullable=False)
    last_edit_time = sa.Column('last_edit_time', sa.DateTime)
    text = sa.Column('text', sa.UnicodeText, default=None)

    user = sa.orm.relationship('User')
    post = sa.orm.relationship('Post')
    scores = sa.orm.relationship(
        'CommentScore', cascade='all, delete-orphan', lazy='joined')

    @property
    def score(self) -> int:
        return (
            get_session()
            .query(sa.sql.expression.func.sum(CommentScore.score))
            .filter(CommentScore.comment_id == self.comment_id)
            .one()[0] or 0)

    __mapper_args__ = {
        'version_id_col': version,
        'version_id_generator': False,
    }