我正在嘗試添加一個表單，以便用戶可以發布他們自己的文章，但是當我點擊發布按鈕時它會顯示Field 'id' expected a number but got 'Free'. 。我沒有將package_category 欄位添加到表單中，因為我在 models.py 中為它設定了默認值
package_category = models.ForeignKey(Package_Category, on_delete=models.DO_NOTHING, verbose_name="Package Category", null=True, default="Free")
當我現在將該package_category 欄位添加到 forms.py 時， fields = [...]它現在顯示此錯誤Field 'id' expected a number but got 'Free'. 。我真的不知道發生了什么
模型.py
class Elements(models.Model):
title = models.CharField(max_length=10000, null=True, blank=True, verbose_name="Title")
slug = models.SlugField(unique=True, max_length=1000)
image = models.ImageField(upload_to="vectors-images/%Y/%m/%d/", default="default.jpg", verbose_name="Image Cover")
vec_file = models.FileField(upload_to='vector-uploads/%Y/%m/%d/', null=True, blank=True, verbose_name="Upload File")
category = models.ForeignKey(Category, on_delete=models.DO_NOTHING, verbose_name="Category", default="vector")
package_category = models.ForeignKey(Package_Category, on_delete=models.DO_NOTHING, verbose_name="Package Category", null=True, default="Free")
file_format = models.ForeignKey(Format, on_delete=models.SET_NULL, null=True, blank=True, default="EPS")
視圖.py
@login_required
def CreateElement(request):
user = request.user
categories = Category.objects.all()
info = Announcements.objects.filter(active=True)
if request.method == "POST":
form = CreateElementForm(request.POST, request.FILES)
if form.is_valid():
form.instance.creator = request.user
element = form.save(commit=False) # ← no commit=False
element.slug = slugify(element.title)
# element.package_category == "Free"
element.save()
messages.success(request, f'Hi, Your Element have been sent for review and would be live soon!')
return redirect('creators:dashboard')
else:
form = CreateElementForm()
context = {
'form': form,
'info': info,
'categories': categories
}
return render(request, 'newpost.html', context)
錯誤跟蹤
System check identified no issues (0 silenced).
January 09, 2022 - 00:14:08
Django version 3.1, using settings 'dexxapikprj.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Internal Server Error: /elements/create/
Traceback (most recent call last):
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\__init__.py", line 1774, in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: 'EPS'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\auth\decorators.py", line 21, in _wrapped_view
return view_func(request, *args, **kwargs)
File "C:\Users\Destiny\Desktop\dexxapik3\DexxaPik\dexxapikprj\elements\views.py", line 241, in CreateElement
element.save()
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\base.py", line 750, in save
self.save_base(using=using, force_insert=force_insert,
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\base.py", line 787, in save_base
updated = self._save_table(
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\base.py", line 892, in _save_table
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\base.py", line 930, in _do_insert
return manager._insert(
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\query.py", line 1249, in _insert
return query.get_compiler(using=using).execute_sql(returning_fields)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\compiler.py", line 1394, in execute_sql
for sql, params in self.as_sql():
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\compiler.py", line 1337, in as_sql
value_rows = [
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\compiler.py", line 1338, in <listcomp>
[self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\compiler.py", line 1338, in <listcomp>
[self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\compiler.py", line 1279, in prepare_value
value = field.get_db_prep_save(value, connection=self.connection)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\related.py", line 971, in get_db_prep_save
return self.target_field.get_db_prep_save(value, connection=connection)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\__init__.py", line 823, in get_db_prep_save
return self.get_db_prep_value(value, connection=connection, prepared=False)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\__init__.py", line 2388, in get_db_prep_value
value = self.get_prep_value(value)
File "C:\Users\Destiny\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\__init__.py", line 1776, in get_prep_value
raise e.__class__(
ValueError: Field 'id' expected a number but got 'EPS'.
[09/Jan/2022 00:14:35] "POST /elements/create/ HTTP/1.1" 500 157932
uj5u.com熱心網友回復：
為外鍵添加默認值時，不能將其設定為“Free”或“EPS”之類的字串。您必須將默認值指向您所指的實際物件。在您的示例中，您必須將其指向由 Package_Category 類創建的物件。下面的代碼只是一個示例，因為我不知道您的 Package_category 的結構：
def get_default_category():
# get_or_create returns a tuple and we will only need the first value, which is the object
return Package_Category.objects.get_or_create(name="Free")[0]
package_category = models.ForeignKey(Package_Category, on_delete=models.DO_NOTHING, verbose_name="Package Category", null=True, default=get_default_category)
請注意，它必須使用 get_or_create 方法，因為如果第一次運行模型，您將沒有可用的物件。確保它是自動創建的以防止錯誤。
錯誤跟蹤告訴您，您還必須將 file_format 欄位的默認值從“EPS”更改。
uj5u.com熱心網友回復：
我懷疑 Package_Category 是具有整數主鍵的常規模型。因此，package_category ForeignKey 定義中的默認值應該是該鍵的有效值。Django 檔案提到：“對于像 ForeignKey 這樣映射到模型實體的欄位，默認值應該是它們參考的欄位的值（除非設定了 to_field，否則為 pk）而不是模型實體。”
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