我最近将Django应用程序部署到了Heroku，并尝试从模型Category中的admin中添加了一个类别后，出现类型错误“ bool类型的对象没有len（）”
就像我说的那样，这是在部署到Heroku之后。在本地托管时，一切正常，没有错误。我试图重置Postgres数据库并再次运行迁移，但仍然遇到相同的错误。
这是我的模特：
# models.py
from django.db import models
from django.utils.translation import ugettext_lazy as _
class Category(models.Model):
name = models.CharField(max_length=200, blank=True)
slug = models.SlugField(blank=True)
def __str__(self):
return self.name
class Meta:
verbose_name = "categories"
verbose_name_plural = "categories"
观看次数：
# views.py
from django.shortcuts import render
from django.shortcuts import render
from django.views.generic import (
ListView,
DetailView
)
from .models import Category
class CategoryListView(DetailView):
template_name = "categories/category_list.html"
model = Category
这是回溯：
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
34. response = get_response(request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
115. response = self.process_exception_by_middleware(e, request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
113. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/options.py" in wrapper
606. return self.admin_site.admin_view(view)(*args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
44. response = view_func(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/sites.py" in inner
223. return view(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/options.py" in add_view
1634. return self.changeform_view(request, None, form_url, extra_context)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapper
45. return bound_method(*args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/options.py" in changeform_view
1522. return self._changeform_view(request, object_id, form_url, extra_context)
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/options.py" in _changeform_view
1560. if all_valid(formsets) and form_validated:
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/formsets.py" in all_valid
448. valid &= formset.is_valid()
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/formsets.py" in is_valid
301. self.errors
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/formsets.py" in errors
281. self.full_clean()
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/formsets.py" in full_clean
325. if not form.has_changed() and i >= self.initial_form_count():
File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/admin/options.py" in has_changed
2111. return super().has_changed()
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/forms.py" in has_changed
434. return bool(self.changed_data)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/functional.py" in __get__
80. res = instance.__dict__[self.name] = self.func(instance)
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/forms.py" in changed_data
456. if field.has_changed(initial_value, data_value):
File "/app/.heroku/python/lib/python3.6/site-packages/django/forms/models.py" in has_changed
1349. if len(initial) != len(data):
Exception Type: TypeError at /admin/categories/category/add/
Exception Value: object of type 'bool' has no len()