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| # -*- coding: utf-8 -*- | |
| from sqlalchemy.orm import validates | |
| from ..helpers.slugify import slugify | |
| from .main import db | |
| class SluggableMixin(object): | |
| name = db.Column(db.Unicode, nullable=False) | |
| slug = db.Column(db.String, nullable=False, index=True) | |
| @property | |
| def _sluggable_query(self): | |
| """This query will be used as the base to search for duplicate slugs. | |
| Overwrite it in your models to search in a subset.""" | |
| return db.query(self.__class__) | |
| @validates('name') | |
| def _set_slug(self, key, value): | |
| """Update the slug when the name is set. | |
| DO NOT update the slug when the name change. | |
| """ | |
| if self.slug: | |
| return value | |
| cls = self.__class__ | |
| oslug = slugify(value or u'nn').lower() | |
| slug = oslug | |
| num = 1 | |
| with db.session.no_autoflush: | |
| query = self._sluggable_query.filter(cls.id != self.id) | |
| while query.filter(cls.slug == slug).count(): | |
| slug = '{0}-{1}'.format(oslug, num) | |
| num = num + 1 | |
| self.slug = slug or u'nn' | |
| return value | |
| @validates('slug') | |
| def _force_set_slug(self, key, value): | |
| """Force the slug to have a value""" | |
| if not value: | |
| value = self._set_slug('name', self.name) | |
| return value | |
| @classmethod | |
| def by_slug(cls, slug, **kwargs): | |
| slug = slug.lower() | |
| return db.query(cls).filter(cls.slug == slug).first() | |
| @classmethod | |
| def by_name(cls, name, **kwargs): | |
| slug = slugify(name) | |
| if not slug: | |
| return None | |
| return cls.by_slug(slug, **kwargs) | |
| Funcion: | |
| def slugify(s, space='-', lower=True): | |
| """ | |
| """ | |
| s = normalize(s) | |
| if lower: | |
| s = s.lower() | |
| # remove dots to prevent U.S.A -> U-S-A | |
| s = s.decode("utf-8") | |
| s = s.replace('.', '') | |
| # replace unwanted characters | |
| s = re.sub(r'[^-a-zA-Z0-9]+', space, s) | |
| # remove redundant "-" | |
| if space: | |
| s = re.sub(space + '{2,}', space, s).strip(space) | |
| return s |
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