example.py

## models.py

class Tag(PrintableModel):
    name = models.CharField(
        verbose_name=_('Name'),
        db_index=True,
        max_length=150,
        help_text="태그 이름",
        unique=True)

    created_at = models.DateTimeField(
        verbose_name=_('Created at'),
        db_index=True, default=timezone.now)

    updated_at = models.DateTimeField(
        verbose_name=_('Updated at'),
        null=True,
        auto_now=True,
    )

    deleted_at = models.DateTimeField(
        verbose_name=_('Deleted at'),
        null=True, blank=True, default=None, db_index=True
    )

    def __str__(self):
        return '{}'.format(self.name)

    class Meta:
        db_table = 'tag'
        managed = True
 
class TourTag(PrintableModel):
    tag = models.ForeignKey(
            'google_tour.Tag',
            verbose_name=_('Tag 태그'),
            on_delete=models.SET_NULL,
            db_index=True,
            null=True,
            related_name="tourtag_tag",
            help_text="태그"
            )

    tour = models.ForeignKey(
            'google_tour.Tour',
            verbose_name=_('Tour'),
            on_delete=models.SET_NULL,
            db_index=True,
            null=True,
            related_name="tourtag_tour",
            help_text="투어"
            )

    created_at = models.DateTimeField(
        verbose_name=_('Created at'),
        db_index=True, default=timezone.now)

    updated_at = models.DateTimeField(
        verbose_name=_('Updated at'),
        null=True,
        auto_now=True,
    )

    deleted_at = models.DateTimeField(
        verbose_name=_('Deleted at'),
        null=True, blank=True, default=None, db_index=True
    )

    def __str__(self):
        return f"{self.tag.name}"

    class Meta:
        db_table = 'tour_tag'
        unique_together = (('tour', 'tag'),)
        managed = True

        
class Tour(PrintableModel):
    name = models.CharField(
        verbose_name=_('Name'),
        max_length=250,
        db_index=True,
        help_text="투어 이름",
        unique=True)

    tags = models.ManyToManyField(
        'google_tour.Tag',
        through="TourTag",
        through_fields=('tour', 'tag'),
        related_name="tags",
        db_index=True,
    )

    class Meta:
        verbose_name = "투어"
        verbose_name_plural = "투어 모음"
        db_table = 'tour'
        managed = True