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from django.db import models# Create your models here.class article(models.Model):        title = models.CharField(maxlength=200)        pub_date = models.DateTimeField('publiceer datum')        intro = models.TextField('korte beschrijving')        article = models.TextField('artikel')        authors = models.ManyToManyField("author", related_name="articles")        def __str__(self):                return self.title        class Admin:                fields = (                        (None, {'fields': ('pub_date', 'title', 'intro',)}),                        ('hier het artikel', {'fields': ('article',)}),                )                list_display = ('title', 'pub_date')                search_fields = ('title')                passclass author(models.Model):        firstname = models.CharField(maxlength=80)        lastname = models.CharField(maxlength=80)        homepage = models.URLField(blank=True)        def __str__(self):                return self.firstname + " " + self.lastname        class Admin:                fields = (                        (None, {'fields': ('firstname', 'lastname', 'homepage',)}),                )                list_display = ('firstname', 'lastname')                passclass article_author(models.Model):        id_article = models.ForeignKey(article)        id_author = models.ForeignKey(author)        def __str__(self):                return self.id_article