Django的quarySet

models.py 代码

 from django.db import models

 # Create your models here.

 class Author(models.Model):
     name = models.CharField(max_length=30)
     qq = models.CharField(max_length=20)
     add = models.CharField(max_length=50)
     email = models.EmailField()

     def __str__(self):
         return self.name

 class Article(models.Model):
     title = models.CharField(max_length=50)
     author = models.ForeignKey(Author, on_delete=models.CASCADE)
     content = models.TextField()
     score = models.IntegerField()
     tags = models.ManyToManyField('Tag')

     def __str__(self):
         return self.title

 class Tag(models.Model):
     name = models.CharField(max_length=50)

     def __str__(self):
         return self.name

initdb.py代码

 import random
 from my_query.wsgi import *
 from blog.models import Author, Article, Tag
 import os,django

 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "my_query.settings")
 django.setup()

 author_name_list = ['dengyexun', 'lina', 'zhangming']
 article_title_list = ['Django book', 'Java book', 'C# book']

 def create_author():
     for author_name in author_name_list:
         author, created = Author.objects.get_or_create(name=author_name)
         author.qq = ''.join(
             str(random.choice(range(10))) for i in range(9)
         )
         author.add = 'addr_%s' % (random.randrange(1, 3))
         author.email = '%s@qq.com' % (author.add)
         author.save()

 def create_article_tag():
     for article_title in article_title_list:
         tag_name = article_title.split(' ')[0]
         tag, created = Tag.objects.get_or_create(name=tag_name)
         random_author = random.choice(Author.objects.all())

         for i in range(1, 21):
             title = '%s_%s' % (article_title, i)
             article, created = Article.objects.get_or_create(
                 title=title, defaults={
                     'author': random_author,
                     'content': '%s content' % title,
                     'score': random.randrange(70, 90),
                 }
             )
             article.tags.add(tag)

 def main():
     create_author()
     create_article_tag()

 if __name__ == '__main__':
     main()
     print('Done')

参考：

https://code.ziqiangxuetang.com/django/django-queryset-advance.html