from django.db import models

class Tag(models.Model):
    __yamdl__ = True

    slug = models.SlugField(max_length=128, primary_key=True)

    content = models.TextField()


class Page(models.Model):
    __yamdl__ = True

    title = models.CharField(max_length=255)

    content = models.TextField()
    slug = models.CharField(max_length=128, unique=True, db_index=True, default=None, null=True)

    tags = models.ManyToManyField(Tag)

    @classmethod
    def from_yaml(cls, **data):
        tags = data.pop("tags", None)
        instance = cls.objects.create(**data)

        if tags:
            instance.tags.set(tags)

        return instance