from flaskbase.extensions import db
from datetime import datetime
from sqlalchemy.orm import foreign, remote


class Page(db.Model):
    __tablename__ = 'pages'
    id = db.Column(db.Integer, primary_key=True)
    slug = db.Column(db.String(64), unique=True)
    title = db.Column(db.String(256))
    content = db.Column(db.Text)

    created = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    updated = db.Column(db.DateTime, default=datetime.utcnow, nullable=False,
                        onupdate=datetime.utcnow)

    subpages = db.relationship(
        'Page', primaryjoin=remote(foreign(slug)).like(slug.concat('/%')),
        viewonly=True)

    def __repr__(self):
        return '<Page {0.slug} "{0.title}">'.format(self)