我是Django新手，
提交并尝试保存在下拉列表之一中选择的更新值时出现错误。
我认为这与传递给表单的日期有关，但我不确定如何解决。
回溯错误：
match = date_re.match(value)TypeError：预期的字符串或类似字节的对象
from django.db import models
class Person(models.Model):
person_name = models.CharField(max_length=50, unique=True)
person_dept = models.ForeignKey('Department',
default='1',
on_delete=models.CASCADE)
number = models.CharField(max_length=10, unique=True)
email = models.EmailField(max_length = 100, unique=True)
class Meta():
db_table = 'person'
def save(self, *args, **kwargs):
for field_name in ['person_name']:
val = getattr(self, field_name, False)
if (val):
setattr(self, field_name, val.title())
super(Person, self).save(*args, **kwargs)
def __str__ (self):
return self.person_name
class Department(models.Model):
dept_desc = models.CharField(max_length=100, unique=True)
class Meta():
db_table = 'dept'
def __str__ (self):
return self.dept_desc
class Roster(models.Model):
roster_date = models.DateField()
oss_person = models.ForeignKey('Person',
on_delete=models.CASCADE,
related_name='+',
limit_choices_to={'person_dept': 1},)
nw_person = models.ForeignKey('Person',
on_delete=models.CASCADE,
related_name='+',
limit_choices_to={'person_dept': 2},)
class Meta():
db_table = 'roster'
def __str__(self):
return str(self.roster_date)
from datetime import datetime, timedelta
from django import forms
from django.core import validators
from roster.models import Roster, Person, Department
class UpdateRosterForm(forms.ModelForm):
class Meta():
model = Roster
fields = '__all__'
labels = {
"roster_date":"Start On Call Date",
"oss_person":"Servers",
"nw_person":"Networks",
}
def __init__(self, *args, **kwargs):
super(UpdateRosterForm, self).__init__(*args, **kwargs)
self.today = datetime.now()
self.min_date = (self.today - timedelta(days=self.today.weekday())
+ timedelta(days=0)).date()
self.fields['roster_date'] = forms.ModelChoiceField(
queryset=Roster.objects.filter(
roster_date__gte=self.min_date),
initial = 0,
label='Start On Call Date')
def clean(self):
roster_date = self.cleaned_data.get("roster_date")
oss_person = self.cleaned_data.get("oss_person")
nw_person = self.cleaned_data.get("nw_person")
{% extends "roster/base.html" %}
{% block title %}Update On Call Roster{% endblock %}
{% block extra_js %}
{% load staticfiles %}
<script type="text/javascript" src='{% static "js/roster_selector.js" %}'></script>
{% endblock extra_js %}
{% block body_block %}
<p>
<div class="container">
<form name="status_form" method="POST">
{% include 'roster/messages.html' %}
{% block content %}
{% endblock %}
</form>
</div>
<div class="container">
<table class="table table-bordered table-striped table-dark table-primary">
<colgroup span="3"></colgroup>
<thead>
<th scope="col">On Call Start Date</th>
<th scope="col">Server</th>
<th scope="col">Networks</th>
</thead>
<trbody>
<form method="POST">
<tr>
{% for field in form %}
<td> {{ field }} </td>
{% endfor %}
</tr>
{% csrf_token %}
</trbody>
</table>
<input class="btn btn-primary" type="submit" value="submit">
</div>
{% endblock %}
def update(request):
form = forms.UpdateRosterForm()
if (request.method == 'POST'):
form = forms.UpdateRosterForm(request.POST)
if (form.is_valid()):
form.save()
form = forms.UpdateRosterForm()
messages.success(request,"Roster Has Been Updated Successfully")
else:
messages.warning(request,"Something Went Wrong!")
return render(request, 'roster/update.html', {'form': form})
def send_selected_date(request):
if (request.method == "GET"):
sel_date = request.GET.get('selected_date')
oncall_ids = Roster.objects.filter(
roster_date = sel_date).values_list('oss_person_id','nw_person_id')
oncall_ids_json = dumps(list(oncall_ids), cls=DjangoJSONEncoder)
return HttpResponse(oncall_ids_json)
Traceback:
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
34. response = get_response(request)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
126. response = self.process_exception_by_middleware(e, request)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
124. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File
"/Users/msl/Documents/scripts/django/oncall_roster/roster/views.py" in update
115. if (form.is_valid()):
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py" in is_valid
185. return self.is_bound and not self.errors
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py" in errors
180. self.full_clean()
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py" in full_clean
383. self._post_clean()
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-
packages/django/forms/models.py" in _post_clean
403. self.instance.full_clean(exclude=exclude,
validate_unique=False)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/base.py" in full_clean
1130. self.clean_fields(exclude=exclude)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/base.py" in clean_fields
1172. setattr(self, f.attname, f.clean(raw_value, self))
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py" in clean
630. value = self.to_python(value)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py" in to_python
1230. parsed = parse_date(value)
File "/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/utils/dateparse.py" in parse_date
74. match = date_re.match(value)
Exception Type: TypeError at /update_roster/
Exception Value: expected string or bytes-like object
答案 0 :(得分：0)
在模型中，您具有roaster_date一个DateField，但是从Form您正在发送一个Roaster对象，这就是您面临此问题的原因。因此，像这样更新表单：
days = self.today - self.min_date
choices = list()
choices.append((self.today, str(self.today)))
new_date = self.today
for i in range(days):
new_date = new_date - datetime.timedelta(days=1)
choices.append((new_date, str(new_date)))
self.fields['roster_date'].widget = forms.Select(choices=choices)