如何使用自定義表單對對象執行操作來創建基於類的視圖

對於清點界面，我希望用戶爲庫存中的新數量項插入小數。具有這個小數點的交易是通過增加差值來設置從股票獲取到實際值的項目。如何使用自定義表單對對象執行操作來創建基於類的視圖

要做到喲我已經加入了插入小數

views.py只提供一個字段的視圖：

class StorageItemStockTakingView(FormView): 
    form_class = StockTakingForm 
    success_url = reverse_lazy('storage_item_list') 
    template_name = 'pmgmt/storageitem/stocktaking.html' 

    def form_valid(self, form): 
     si = StorageItem.objects.get(pk=self.kwargs["pk"]) 
     si.stock_report(
      Decimal(self.request.POST["amount"]), self.request.user) 
     return super(StorageItemStockTakingView, self).form_valid(form)

基於自定義表單中forms.py

class StockTakingForm(forms.Form): 
    amount = forms.DecimalField(
     _("Parts now inside storage"), 
     max_digits=10, 
     decimal_places=4, 
     help_text=_("The amount of currently inside storage place."))

所用的模板是安靜簡單：

{% extends "base.html" %} 

{% load i18n %} 
{% load semanticui %} 

{% block content %} 
<h1>{{ object }}</h1> 
<p>{% trans "It will create an Transaction adjusting the amount for items on stock to reported one.." %}</p> 
<form method="post" class="ui form segment"> 
    {% csrf_token %} 
    {{ form|semanticui }} 
    <input class="ui button blue" type="submit" value="Submit"> 
</form> 
{% endblock %}

這確實與Python2一起工作。但我使用這個在Python3時，我得到一個錯誤

2016-12-27 19:17:57,206 django.request 24760 Thread-2 ERROR Internal Server Error: /pmgmt/storageitem/1/stocktaking/ 
Traceback (most recent call last): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view 
    return view_func(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/base.py", line 88, in dispatch 
    return handler(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/edit.py", line 221, in post 
    if form.is_valid(): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 161, in is_valid 
    return self.is_bound and not self.errors 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 153, in errors 
    self.full_clean() 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 362, in full_clean 
    self._clean_fields() 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 380, in _clean_fields 
    value = field.clean(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/fields.py", line 168, in clean 
    self.run_validators(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/fields.py", line 151, in run_validators 
    v(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/validators.py", line 310, in __call__ 
    if self.compare(cleaned, self.limit_value): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/validators.py", line 324, in <lambda> 
    compare = lambda self, a, b: a > b 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/utils/functional.py", line 148, in __lt__ 
    return self.__cast() < other 
TypeError: unorderable types: str() < decimal.Decimal() 
2016-12-27 19:17:57,206 django.request 24760 Thread-2 ERROR Internal Server Error: /pmgmt/storageitem/1/stocktaking/ 
Traceback (most recent call last): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view 
    return view_func(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/base.py", line 88, in dispatch 
    return handler(request, *args, **kwargs) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/views/generic/edit.py", line 221, in post 
    if form.is_valid(): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 161, in is_valid 
    return self.is_bound and not self.errors 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 153, in errors 
    self.full_clean() 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 362, in full_clean 
    self._clean_fields() 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/forms.py", line 380, in _clean_fields 
    value = field.clean(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/fields.py", line 168, in clean 
    self.run_validators(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/forms/fields.py", line 151, in run_validators 
    v(value) 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/validators.py", line 310, in __call__ 
    if self.compare(cleaned, self.limit_value): 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/core/validators.py", line 324, in <lambda> 
    compare = lambda self, a, b: a > b 
    File "/home/frlan/quellen/partuniverse/p3/lib/python3.5/site-packages/django/utils/functional.py", line 148, in __lt__ 
    return self.__cast() < other 
TypeError: unorderable types: str() < decimal.Decimal()

所以我想知道什麼是基於類的視圖上下文做這樣的事情最近的Django版本的正確方法是什麼？

來源

2016-12-27 frlan

這不是你的錯誤，這是我看到現在已經確定的來源，但我個人會用' form.cleaned_data ['amount']'作爲arg到'si.stock_report'而不是'Decimal（self.request.POST [「amount」]）''。 –

第一個位置參數的forms.DecimalField不是標籤，但最大值 - 這就是爲什麼錯誤抱怨的字符串（該值）與INT（領域的實際值）比較。

通常你不應該使用的表單字段類位置ARGS - 使用kwargs一致：

amount = forms.DecimalField(
    label=_("Parts now inside storage"), 
    ...)

來源

2016-12-27 20:05:11

如何使用自定義表單對對象執行操作來創建基於類的視圖

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