如何使用模型对象数据填写表单？

发布于 2024-11-30 07:55:02 字数 547 浏览 0 评论 0原文

我想用模型实例的数据填写表单。但我的表单的字段比模型少。如果我有这样的代码：

class Item(models.Model)
    name = models.CharField(max_length=100)
    price = models.PositiveIntegerField()

class ItemForm(forms.Form):
    name = forms.CharField()

这个函数有什么问题以及它应该看起来如何才好？

def bound_form(request, id):
    item = Item.objects.get(id=id)
    form = ItemForm(item.name)
    return render_to_response('bounded_form.html', {'form': form})

我收到这样的错误： AttributeError: 'ItemForm' object has no attribute 'get'

原文

I want to fill up form with data from model instance. But my form has less fields than model. If I have code like this:

class Item(models.Model)
    name = models.CharField(max_length=100)
    price = models.PositiveIntegerField()

class ItemForm(forms.Form):
    name = forms.CharField()

What wrong is with this function and how it should look to be good?

def bound_form(request, id):
    item = Item.objects.get(id=id)
    form = ItemForm(item.name)
    return render_to_response('bounded_form.html', {'form': form})

I getting error like this: AttributeError: 'ItemForm' object has no attribute 'get'

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赏烟花じ飞满天 2024-12-07 07:55:02

通常，在为模型创建表单时，您需要使用 ModelForm。它遵循 DRY 原则，因此您不必重新定义表单类的字段类型。它还自动处理验证。您保留充分的灵活性来自定义所使用的字段和小部件。使用 fields 指定您想要的字段，或使用 exclude 指定要忽略的字段。以您的示例为例：

from django import forms
from django.shortcuts import get_object_or_404

class ItemForm(forms.ModelForm):
    class Meta:
        model = Item
        fields = ("name", )

def bound_form(request, id):
    item = get_object_or_404(Item, id=id)
    form = ItemForm(instance=item)
    return render_to_response('bounded_form.html', {'form': form})

get_object_or_404() 在这里作为错误处理的一种形式很有用。否则，在丢失的 ID 上使用 Item.objects.get(id=id) 将引发未捕获的 Item.DoesNotExist 异常。当然，您也可以使用 try/ except 块。

Generally when creating a form for a Model, you will want to use ModelForm. It keeps to the DRY principle such that you do not have to redefine field types for the form class. It also automatically handles validation. You retain full flexibility to customize the fields and widgets used. Use fields to specify the fields you want or exclude to specify fields to ignore. With your example:

from django import forms
from django.shortcuts import get_object_or_404

class ItemForm(forms.ModelForm):
    class Meta:
        model = Item
        fields = ("name", )

def bound_form(request, id):
    item = get_object_or_404(Item, id=id)
    form = ItemForm(instance=item)
    return render_to_response('bounded_form.html', {'form': form})

get_object_or_404() is useful here as a form of error handling. Using Item.objects.get(id=id) on a missing ID will throw an uncaught Item.DoesNotExist exception otherwise. You could use a try/except block also of course.

回复收藏 0 原文

因为看清所以看轻 2024-12-07 07:55:02

def bound_form(request, id): 
    item = Item.objects.get(id=id) 
    form = ItemForm(initial={'name': item.name}) 
    return render_to_response('bounded_form.html', {'form': form})

def bound_form(request, id): 
    item = Item.objects.get(id=id) 
    form = ItemForm(initial={'name': item.name}) 
    return render_to_response('bounded_form.html', {'form': form})

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~没有更多了~