Django DateField TypeError 预期的字符串或类似字节的对象

Posted 2023-03-10

【中文标题】Django DateField TypeError 预期的字符串或类似字节的对象

【英文标题】：Django DateField TypeError expected string or bytes-like object

【发布时间】：2019-05-15 08:43:44

【问题描述】：

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此问题。

回溯错误：

match = date_re.match(value)

TypeError：预期的字符串或类似字节的对象

我的模型.py

​​>

  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)

我的表单.py

​​>

 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")

我的模板文件

% 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 %

我的意见.py

​​>

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)

追溯

追溯： 内部文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/exception.py” 34. 响应 = get_response(请求) _get_response 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/base.py” 126. 响应 = self.process_exception_by_middleware（e，请求） _get_response 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/core/handlers/base.py” 124.响应=wrapped_callback（请求，*callback_args，**callback_kwargs） 文件 更新中的“/Users/msl/Documents/scripts/django/oncall_roster/roster/views.py” 115. if (form.is_valid()): is_valid 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py” 185. 返回 self.is_bound 而不是 self.errors 错误中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py” 180. self.full_clean() full_clean 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/forms/forms.py” 383. self._post_clean() 文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site- _post_clean 中的 packages/django/forms/models.py" 403. self.instance.full_clean（排除=排除， 验证唯一=假） full_clean 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/base.py” 1130. self.clean_fields（排除=排除） clean_fields 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/base.py” 1172. setattr (self, f.attname, f.clean(raw_value, self)) 清理文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py” 630. 值 = self.to_python（值） to_python 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py” 1230.解析=解析日期（值） parse_date 中的文件“/Users/msl/Documents/scripts/django/env/lib/python3.6/site-packages/django/utils/dateparse.py” 74. 匹配 = date_re.match(值) 异常类型：/update_roster/ 处的 TypeError 异常值：预期的字符串或类似字节的对象

【参考方案1】：

在您的模型中，您有 bakeer_date 一个 DateField，但您从 Form 发送了一个 Roaster 对象，这就是您面临此问题的原因。所以像这样更新表格：

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)

【讨论】：

感谢您的回复。如果我从 ModelChoiceField() 更改为 DateField() ，则它不再是下拉列表。我想将其保留为下拉菜单，以便用户可以选择日期。