在这里，我试图通过选择加入日期的年，月和组织来按三个条件过滤人员。为此，我尝试了这种方法，但是它不起作用。我在这里做错了什么？
Exception Type: ValueError
Exception Value:
invalid literal for int() with base 10: ''
我也发现我在下面针对这个问题尝试了太长时间的这种方法。如果对此有更好的解决方案，那将是一个很大的帮助
models.py
class Staff(models.Model):
user = models.OneToOneField(get_user_model(), on_delete=models.CASCADE, related_name='staff')
name = models.CharField(max_length=255, blank=True, null=True)
organization = models.ForeignKey(Organization, on_delete=models.SET_NULL, blank=True, null=True,
related_name='staff')
joined_date = models.DateField(blank=True, null=True)
views.py
def filter_staff_users(request):
year = request.GET.get('year')
month = request.GET.get('month')
organization = request.GET.get('organization')
present_year = datetime.datetime.today().year
years_list = range(2016,present_year + 1)
if year or month or organization:
staffs = Staff.objects.filter(
Q(joined_date__year=year) | Q(joined_date__month=month) | Q(organization=organization))
return render(request, 'organization/view_staff_users.html',
{'years_list': years_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
elif year and month and organization:
staffs = Staff.objects.filter(Q(joined_date__year=year), Q(joined_date__month=month),
Q(organization=organization))
return render(request, 'organization/view_staff_users.html',
{'years_list': years_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
elif year:
staffs = Staff.objects.filter(joined_date__year=year)
return render(request, 'organization/view_staff_users.html',
{'years_list': years_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
elif month:
staffs = Staff.objects.filter(joined_date__month=month)
return render(request, 'organization/view_staff_users.html',
{'years_list': years_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
elif organization:
staffs = Staff.objects.filter(organization=organization)
return render(request, 'organization/view_staff_users.html',
{'years_list': rangeyears_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
else:
messages.info(request, 'Nothing selected to filter.')
return redirect('organization:view_staff_users')
模板
<form action="{% url 'organization:filter_staffs' %}" class='form-inline' >
<select name="year">
<option value="">Select Year</option>
{% for year in years_list %}
<option value="{{year}}">
{{year}}
</option>
{% endfor %}
</select>
<select name="month" >
<option >Select Month</option>
<option value="01">January</option>
#months names here
</select>
<select name="organization">
<option value="">Select Organization</option>
{% for organization in organizations %}
<option value="{{organization.pk}}">{{organization.name}}</option>
{% endfor %}
</select>
<div>
<button type="submit" class="btn btn-info">Find Staffs</button>
</div>
</form>
完整追溯：
Internal Server Error: /organization/filter/all/staffs/
Traceback (most recent call last):
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "D:\VzealProjects\StaffMgmt\organization\views.py", line 321, in filter_staff_users
Q(joined_date__year=year) | Q(joined_date__month=month) | Q(organization=organization))
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\query.py", line 844, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\query.py", line 862, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\sql\query.py", line 1263, in add_q
clause, _ = self._add_q(q_object, self.used_aliases)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\sql\query.py", line 1281, in _add_q
current_negated, allow_joins, split_subq)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\sql\query.py", line 1287, in _add_q
split_subq=split_subq,
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\sql\query.py", line 1225, in build_filter
condition = self.build_lookup(lookups, col, value)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\sql\query.py", line 1096, in build_lookup
lookup = lookup_class(lhs, rhs)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\lookups.py", line 20, in __init__
self.rhs = self.get_prep_lookup()
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\lookups.py", line 70, in get_prep_lookup
return self.lhs.output_field.get_prep_value(self.rhs)
File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\__init__.py", line 1807, in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: ''
[11/Sep/2019 12:47:31] "GET /organization/filter/all/staffs/?year=&month=Select+Month&organization= HTTP/1.1" 500 121189
答案 0 :(得分：0)
您的第一个if封锁意义不大。您检查<ul>
<li>
<a href="#">
<span class="tag">Tag</span>
<div class="date">September 2019</div>
<span class="title">Text 01</span>
</a>
<div class="category">My category</div>
</li>
<li>
<a href="#">
<span class="tag">Tag</span>
<div class="date">Nov 2019</div>
<span class="title">Text 01</span>
</a>
<div class="category">My category 2</div>
</li>
<li>
<a href="#">
<span class="tag">Tag</span>
<div class="date">Dec 2019</div>
<span class="title">Text 01</span>
</a>
<div class="category">My category3</div>
</li>
</ul>
，即如果它们中的任何是非空的，然后使用year or month or organization对它们中的 all 进行过滤；如果其中任何一个实际上为空白，您将得到该错误。
我无法说出您在该区块中要做什么，但是考虑到要处理其他区块中的其他组合，您应该删除它。
答案 1 :(得分：0)
我遇到了类似的问题，我必须根据可用数据动态构建过滤器。我最终得到了类似于以下内容的内容：（未经测试的代码，让您有个好主意）
filters = Q()
if year is not None:
filters = filters & Q(joined_date__year=year)
if month is not None:
filters = filters & Q(joined_date__month=month)
if organization is not None:
filters = filters & Q(organization=organization)
staffs = Staff.objects.filter( filters )
return render(request, 'organization/view_staff_users.html',
{'years_list': years_list, 'staffs': staffs, 'year': year, 'month': month,
'organization': organization})
在上面的代码中，具有值的字段将添加到filters变量中，我们将使用该变量从Staff模型中获取值。这样，您的所有情况都将得到最小化。