[英]I'm writing a library system, and I'm getting this Django Error Message
我正在編寫一個圖書館系統,並且收到此Django錯誤消息:
無法分配“'1'”:“ BookInfo.purchase_sn”必須是“ PurchaseOrderInfo”實例。
並且還會在author_sn,author_type ....和所有foreginkey字段上顯示相同的消息。
以下是我的觀點和模型。
我究竟做錯了什么?
my view is :
def book_add_new(request):
print(request.POST)
book_add_info = BookInfo(book_sn=request.POST['this_bk_sn'],
voucher_sn=int(request.POST['vochr_sn']),
book_genre=request.POST['bk_genre'],
book_state=request.POST['bk_state'],
book_group_sn=request.POST['cpy_group'],
book_classification=request.POST['bk_classification'],
book_primary_title=request.POST['primry_title'],
book_secondary_title=request.POST['scndry_title'],
author_sn=request.POST['authr_sn'],
author_type=request.POST['authr_type_sn'],
publisher_sn=request.POST['puplshr_sn'],
publishing_country=request.POST['cntry_sn'],
book_price=request.POST['bk_price'],
book_isbn=request.POST['bk_isbn'],
book_edition=request.POST['bk_edition'],
publish_date=request.POST['bk_year'],
book_page_count=request.POST['page_count'],
purchase_sn=request.POST['prchs_sn'],
book_in=1)
book_add_info.save()
return render(request, 'book_management/book_add_new_page.html')
我的模特:
class PurchaseOrderInfo(models.Model):
purchase_sn = models.IntegerField(primary_key=True)
purchase_owner = models.TextField(blank=True, null=True)
order_date = models.DateField(blank=True, null=True)
order_scan = models.BinaryField(blank=True, null=True)
class Meta:
managed = True
db_table = 'purchase_order_info'
class BookInfo(models.Model):
book_classification = models.TextField(blank=True, null=True)
book_isbn = models.TextField(blank=True, null=True)
book_secondary_title = models.TextField(blank=True, null=True)
book_group_sn = models.IntegerField(blank=True, null=True)
voucher_snv = models.ForeignKey(BookVoucher, models.DO_NOTHING, db_column='voucher_sn', blank=True, null=True)
book_primary_title = models.TextField(blank=True, null=True)
purchase_sn = models.ForeignKey(PurchaseOrderInfo, models.DO_NOTHING, db_column='purchase_sn', blank=True,
null=True)
book_page_count = models.IntegerField(blank=True, null=True)
book_sn = models.IntegerField(primary_key=True)
book_genre = models.ForeignKey(BookGenres, models.DO_NOTHING, db_column='book_genre', blank=True, null=True)
book_state = models.ForeignKey('BookState', models.DO_NOTHING, db_column='book_state', blank=True, null=True)
book_edition = models.IntegerField(blank=True, null=True)
publish_date = models.IntegerField(blank=True, null=True)
book_price = models.TextField(blank=True, null=True) # This field type is a guess.
author_sn = models.ForeignKey(AuthorInfo, models.DO_NOTHING, db_column='author_sn', blank=True, null=True)
author_type = models.ForeignKey(AuthorType, models.DO_NOTHING, db_column='author_type', blank=True, null=True)
publisher_sn = models.ForeignKey(PublisherInfo, models.DO_NOTHING, db_column='publisher_sn', blank=True, null=True)
book_in = models.BooleanField()
publishing_country = models.ForeignKey('CountryInfo', models.DO_NOTHING, db_column='publishing_country', blank=True,
null=True)
def __str__(self):
return self.book_primary_title
class Meta:
managed = True
db_table = 'book_info'
錯誤消息將告訴您確切的操作:您需要將PurchaseOrderInfo分配給purchase_sn-Member。
您可以通過PurchaseOrderInfo.get
查找它,或者如果將purchase_sn設置為另一個PurchaseOrderInfo的主鍵,則可以正常工作。 這是一個整數,而不是request.POST
的字符串
祝您在Django上的努力好運!
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