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[英]How do I solve django.db.utils.IntegrityError: UNIQUE constraint failed?
[英]How do i solve this error : django.db.utils.IntegrityError: NOT NULL constraint failed
我正在為我的心願單按鈕/視圖編寫單元測試,我正在嘗試檢查我的書 ISBN 和用戶 ID 是否在我按下按鈕后添加到心願單中。 我試過了,但它一直給我標題中所述的錯誤。
這是我的代碼:
#tests.py
class wishlist_view_test(TestCase):
@classmethod
def setUpTestData(cls):
books.objects.create(ISBN = "976354890", bookName = "testingbook1", bookVersion = "1",bookAuthor = "Carlie Presley", bookPublisher = "TeamBananaMonkey1")
retailer.objects.create(retailer= "Amazon", sellerID = 1)
retailer_book.objects.create(condition = "new", reviews = "4.5", ID= 1, bookType = "hardcover", ISBN_id= "976354890", sellerID_id = 1, price = 177.98)
def test_wishlist_button(self):
user = User.objects.create_user(username='user1', password='djangolife')
self.client.login(username='user1', password='djangolife')
response1 = self.client.post(reverse('TextSearch:wishlist',args=("976354890",)))
self.assertEqual(str(wishlist.objects.filter(userid_id= user.id),'<QuerySet [..........]>')
#html code
<form action="{% url 'TextSearch:wishlist' book.pk %}" method="post">
{% csrf_token %}
<input type="hidden" value="{{book.pk}}" name="isbn">
<input type="submit" value="Add to wishlist★">
#views.py
class wishlistView(TemplateView):
template_name = 'TextSearch/wishlist.html'
model = wishlist
def post(self, request, pk):
isbn = self.request.POST.get('isbn')
current_user = request.user
book = wishlist(userid_id = current_user.id, ISBN_id = isbn)
book.save()
return render(request, 'TextSearch/wishlist.html')
#models.py
class wishlist (models.Model):
userid = models.ForeignKey(User, on_delete= models.CASCADE)
ISBN = models.ForeignKey(books, on_delete = models.CASCADE)
class books (models.Model):
ISBN = models.CharField(max_length=255, primary_key=True)
bookName = models.CharField(max_length=255)
bookVersion = models.CharField(max_length=255)
bookAuthor = models.CharField(max_length=255)
bookPublisher = models.CharField(max_length=255, default ='NULL')
我正在使用 Django 的內置用戶模型。
*** 回溯錯誤 ***
Traceback (most recent call last):
File "C:\Users\ytann\Desktop\textbooks-for-less-9-website-design\textbooks-for-less-9-website-design\TextSearch\tests.py", line 67, in test_wishlist_button
response1 = self.client.post(reverse('TextSearch:wishlist',args=("976354890",)))
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\test\client.py", line 741, in post
response = super().post(path, data=data, content_type=content_type, secure=secure, **extra)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\test\client.py", line 404, in post
return self.generic('POST', path, post_data, content_type,
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\test\client.py", line 470, in generic
return self.request(**r)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\test\client.py", line 709, in request
self.check_exception(response)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\test\client.py", line 571, in check_exception
raise exc_value
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\core\handlers\base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\views\generic\base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\views\generic\base.py", line 98, in dispatch
return handler(request, *args, **kwargs)
File "C:\Users\ytann\Desktop\textbooks-for-less-9-website-design\textbooks-for-less-9-website-design\TextSearch\views.py", line 25, in post
book.save()
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\base.py", line 753, in save
self.save_base(using=using, force_insert=force_insert,
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\base.py", line 790, in save_base
updated = self._save_table(
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\base.py", line 895, in _save_table
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\base.py", line 933, in _do_insert
return manager._insert(
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\query.py", line 1249, in _insert
return query.get_compiler(using=using).execute_sql(returning_fields)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\models\sql\compiler.py", line 1397, in execute_sql
cursor.execute(sql, params)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\backends\utils.py", line 66, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\backends\utils.py", line 75, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\ytann\Desktop\python\lib\site-packages\django\db\backends\sqlite3\base.py", line 413, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: User_wishlist.ISBN_id
**編輯**我覺得做self.client.post有點問題,但我似乎無法弄清楚是什么問題
在 test.py 中使用這個:
response1 = self.client.post(reverse('TextSearch:wishlist',kwargs={'isbn': '976354890'}))
代替:
response1 = self.client.post(reverse('TextSearch:wishlist',args=("976354890",)))
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