我尝试将网页保存到数据库，url 应该是唯一的。如果 url 已经存在，我只需要在网页类和搜索类之间创建关系。但问题是，即使数据库为空并且操作发生在 DoesNotExist 异常中，我也会不断收到此 IntegrityError。请帮我解决我的问题。
这是执行保存的 block views.py 代码。
websearch.startSearch(maxPage=2)
for result in websearch.searchResult:
try:
web = Webpage.objects.get(url=result)
searching.objects.create(webpage=web, keyword=keyword)
except Webpage.DoesNotExist:
web = Webpage.objects.create(url=result)
searching.objects.create(webpage=web, keyword=keyword)
这是网页和搜索模型
class Webpage(models.Model) :
"webpage from search result and client's websites"
domain = models.ForeignKey(Domain, blank=True, null=True)
webhosting = models.ForeignKey(WebHosting, blank=True, null=True)
url = models.URLField(max_length=250, blank=False, unique=True)
html_page = models.TextField(blank=True, null=True)
inspect_status = models.BooleanField(blank=True)
scam_status = models.BooleanField(blank=True)
report_status = models.BooleanField(blank=True)
access_status = models.BooleanField(blank=True)
whitelist_status = models.BooleanField(blank=True)
compare_to = models.ForeignKey('self', blank=True, null=True)
def __unicode__(self):
return self.url
class searching (models.Model):
'information on each searching activity'
keyword = models.ForeignKey(Keyword, blank=True, null=True)
token = models.ForeignKey(Token, blank=True, null=True)
webpages = models.ForeignKey(Webpage)
date = models.DateField(auto_now=True)
class comparison(models.Model):
'''comparing website to other websites with the same event and label'''
source = models.ForeignKey(Webpage, related_name='compare_source')
destination = models.ForeignKey(Webpage, related_name='compare_destination')
time = models.DateTimeField(auto_now=True)
fuzz_ratio = models.FloatField()
fuzz_partial_ratio = models.FloatField()
fuzz_token_sort_ratio = models.FloatField()
fuzz_token_set_ratio = models.FloatField()
difflib_ratio = models.FloatField()
difflib_quick_ratio = models.FloatField()
difflib_real_quick_ratio = models.FloatField()
levenshtein_ratio = models.FloatField()
levenshtein_seqratio = models.FloatField()
请您参考如下方法:
你不需要处理异常，你可以使用 get_or_create 内置函数。
websearch.startSearch(maxPage=2)
for result in websearch.searchResult:
webpage, created = Webpage.objects.get_or_create(url=result)
#webpage is a instance
#created is True is a new instance was created or False if it already existed.
还有，你打错了
searching.objects.create(webpage=web, keyword=keyword)
应该是
searching.objects.create(webpages=web, keyword=keyword)
Searching对象有webpages属性，不是网页，需要添加's'
