作者的查，增，删，改
阅读目录
APP中的models
# 作者 class Author(models.Model): name = models.CharField(max_length=32, unique=True) books = models.ManyToManyField('Book',through='Author_book') def __str__(self): return self.name class Author_book(models.Model): author = models.ForeignKey('Author', on_delete=models.CASCADE) book = models.ForeignKey('Book', on_delete=models.CASCADE) date = models.DateTimeField()
urls
from django.conf.urls import url from django.contrib import admin from app01 import views urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^publisher/', views.publisher), url(r'^add_publisher/', views.add_publisher), url(r'^del_publisher/', views.del_publisher), url(r'^edit_publisher/', views.edit_publisher), url(r'^test/', views.test), # 展示作者 url(r'^author/', views.author), # 增加作者 url(r'^add_author/', views.add_author), # 删除作者 url(r'^del_author/', views.del_author), # 编辑作者 url(r'^edit_author/', views.edit_author), ]
App中的views 与 templates
查操作
views
def author(request): # 查询所有作者 all_authors = models.Author.objects.all().order_by('pk') #按照作者的ID进行排序 for author in all_authors: print(author) #所有的作者对象 print(author.pk) print(author.name) print(author.books, type(author.books)) # 多对多关系管理对象 print(author.books.all(), type(author.books.all())) # 多对多关系管理对象对的book对象 print('*' * 30) return render(request, 'author.html', {'all_authors': all_authors})
templates
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <table border="1"> <thead> <tr> <th>序号</th> <th>姓名</th> <th>代表作</th> <th>操作</th> </tr> </thead> <tbody> {% for author in all_authors %} <tr> <td>{{ forloop.counter }}</td> #序号 <td>{{ author.name }}</td> <td> {% for book in author.books.all %} #通过多对多管理对象得到每个book对象 {% if forloop.last %} #如果循环到最后一个 《{{ book.name }}》 {% else %} 《{{ book.name }}》、 {% endif %} {% endfor %} </td> <td> <a href="/del_author/?pk={{ author.pk }}">删除</a> <a href="/edit_author/?pk={{ author.pk }}">编辑</a> </td> </tr> {% endfor %} </tbody> </table> </body> </html>
增操作
views
# 增加作者 def add_author(request): if request.method == 'POST': # 新增数据 # 获取提交的数据 name = request.POST.get('name') books_id = request.POST.getlist('books_id') #获得的是一个列表 # 插入到数据库中 author_obj = models.Author.objects.create(name=name) # 绑定书籍和作者的关系 author_obj.books.set(books_id) # 跳转到展示页面 return redirect('/author/') # 查询所有的书籍 all_books = models.Book.objects.all() return render(request, 'add_author.html', {'all_books': all_books})
templates
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="" method="post">
<p>
姓名：<input type="text" name="name">
</p>
<p>
代表作：
<select name="books_id" id="" multiple>
{% for book in all_books %}
<option value="{{ book.pk }}">{{ book.name }}</option>
{% endfor %}
</select>
</p>
<button>提交</button>
</form>
</body>
</html>
删操作
views
def del_author(request): pk = request.GET.get('pk') models.Author.objects.filter(pk=pk).delete() # 1.删除作者的书籍 # 2.删除作者和书籍的多对多的关系 return redirect('/author/')
改操作
views
def edit_author(request): # 查询作者 pk = request.GET.get('pk') author_obj = models.Author.objects.get(pk=pk) books_id = [ i.book_id for i in models.Author_book.objects.filter(author_id=pk) ] books = models.Book.objects.filter(pk__in=books_id) if request.method == 'POST': # 修改数据 new_name = request.POST.get('name') books_id = request.POST.getlist('books_id') # 修改作者姓名 author_obj.name = new_name author_obj.save() # 修改作者和书籍多对多的关系 author_obj.books.set(books_id) return redirect('/author/') # 查询所有的书籍 all_books = models.Book.objects.all() return render(request, 'edit_author.html', {'author_obj': author_obj, 'all_books': all_books,'books':books})
templates
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="" method="post"> <p> 姓名：<input type="text" name="name" value="{{ author_obj.name }}"> </p> <p> 代表作： <select name="books_id" id="" multiple> {% for book in all_books %} {% if book in books %} <option selected value="{{ book.pk }}">{{ book.name }}</option> {% else %} <option value="{{ book.pk }}">{{ book.name }}</option> {% endif %} {% endfor %} </select> </p> <button>提交</button> </form> </body> </html>
