CODEWITHSUNDEEP
pythonflaskslug
anouar
anouar

Reputation: 125

slug field on flask

I want to create a slug field stored in database.

I searched and I found http://flask.pocoo.org/snippets/5/ but I'm having trouble integrating the code in my app.

This is my modele.py:

from unicodedata import normalize


def slugfy(text, encoding=None,
        permitted_chars='abcdefghijklmnopqrstuvwxyz0123456789-'):
    if isinstance(text, str):
        text = text.decode(encoding or 'ascii')
    clean_text = text.strip().replace(' ', '-').lower()
    while '--' in clean_text:
        clean_text = clean_text.replace('--', '-')
    ascii_text = normalize('NFKD', clean_text).encode('ascii', 'ignore')
    strict_text = map(lambda x: x if x in permitted_chars else '', ascii_text)
    return ''.join(strict_text)


class Chanteur(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    nom = db.Column(db.String(200), index = True, unique = True)
    slug = db.Column(db.String(255))
    chanteurs = db.relationship('Chanson', backref = 'chanteur', lazy = 'dynamic')

    def __repr__(self):
        return '<Chanteur %r>' % (self.nom)

    def __setattr__(self, key, value):
        super(Chanteur, self).__setattr__(key, value)
        if key == 'nom':
            self.slug = slugfy(self.nom)


class Chanson(db.Model):
        id = db.Column(db.Integer, primary_key = True)
        titre = db.Column(db.String(255))
        chanteur_id = db.Column(db.Integer, db.ForeignKey('chanteur.id'))

        def __repr__(self):
            return '<Chanson %r>' % (self.titre)

It is not working: when I add a new objet (chanteur) the slug field is empty

Upvotes: 7

Views: 11383

Answers (6)

schumskie
schumskie

Reputation: 157

I wrote an article about this topic. My approach is to use the 'before_commit' event for the session. You can read about it here

Upvotes: 0

Liran BG
Liran BG

Reputation: 81

A small improvement on @berislav-lopac suggestion's, Using python-slugify you can

from slugify import slugify


class SlugModel(Base):
    name = Column(String)
    slug = Column(String)

    @staticmethod
    def slugify(target, value, oldvalue, initiator):
        if value and (not target.slug or value != oldvalue):
            target.slug = slugify(value)

event.listen(SlugModel.name, 'set', SlugModel.slugify, retval=False)

This will update slug's column content on create\update

if you want even a better solution, you can use the @hybrid_property decorator as suggested here

Upvotes: 8

Berislav Lopac
Berislav Lopac

Reputation: 17273

To persist the slug in the database, I use the following approach (employing the very helpful python-slugify library):

from slugify import slugify  # among other things

class Song(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    title = db.Column(db.String(255))
    slug = db.Column(db.String(255))

    def __init__(self, *args, **kwargs):
        if not 'slug' in kwargs:
            kwargs['slug'] = slugify(kwargs.get('title', ''))
        super().__init__(*args, **kwargs)

Upvotes: 18

user4551138
user4551138

Reputation: 1

in the slug function above, you need to do the loop

clean_text.replace('--', '-')

AFTER you reduce it to permitted characters. If you don't: This & That will be returned as this--that.

Upvotes: -2

andmart
andmart

Reputation: 552

Salute,

you can do this way if you want the slug field represents le titre de la Chanson.

from unicodedata import normalize


def slug(text, encoding=None,
         permitted_chars='abcdefghijklmnopqrstuvwxyz0123456789-'):
    if isinstance(text, str):
        text = text.decode(encoding or 'ascii')
    clean_text = text.strip().replace(' ', '-').lower()
    while '--' in clean_text:
        clean_text = clean_text.replace('--', '-')
    ascii_text = normalize('NFKD', clean_text).encode('ascii', 'ignore')
    strict_text = map(lambda x: x if x in permitted_chars else '', ascii_text)
    return ''.join(strict_text)



class Chanson(object):

    titre = ''
    slugfield = ''

    def __setattr__(self, key, value):
        super(Chanson, self).__setattr__(key, value)
        if key == 'titre':
            self.slugfield = slug(self.titre)

m = Chanson()
m.titre = 'Non, je ne regrette rien'
print m.titre
print m.slugfield

The slug method was grabbed from here

Edited

def slug(text):
    #slugfy logic here


class Chanson(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    titre = db.Column(db.String(255))
    chanteur_id = db.Column(db.Integer, db.ForeignKey('chanteur.id'))
    slugfield = db.Column(db.String(255))

    def __setattr__(self, key, value):
        super(Chanson, self).__setattr__(key, value)
        if key == 'titre':
            self.slugfield = slug(self.titre)

Upvotes: 0

ajknzhol
ajknzhol

Reputation: 6460

Install package called Webhelpers and it makes slugification a piece of cake.

from webhelpers.text import urlify


class Chanteur(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    nom = db.Column(db.String(200), index=True, unique=True)
    chanteurs = db.relationship('Chanson', backref='chanteur', lazy='dynamic')

    def __repr__(self):
        return '<Chanteur %r>' % (self.nom)

    @property
    def slug(self):
        return urlify(self.nom)


class Chanson(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    titre = db.Column(db.String(255))
    chanteur_id = db.Column(db.Integer, db.ForeignKey('chanteur.id'))

    def __repr__(self):
        return '<Chanson %r>' % (self.titre)

    @property
    def slug(self):
        return urlify(self.nom)

Refer docs for more info.

Upvotes: 1

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