使用视图中数据库中的数据填充 django 表单

发布于 2024-10-13 19:49:11 字数 510 浏览 1 评论 0原文

我的 forms.py 中有一个表单，如下所示：

from django import forms

class ItemList(forms.Form):
     item_list = forms.ChoiceField()

我需要使用数据库中的一些数据填充 item_list 。当在 HTML item_list 中生成时，应该类似于：

<select title="ItemList">
   <option value="1">Select Item 1</option>
   <option value="2">Select Item 2</option>
</select>

我的 select 语句中的选项值几乎每次都会更改，因为查询中的变量经常会更改生成新结果。

我需要在 view.py 和模板文件中添加哪些内容才能使用数据库中的值填充 ItemList？

原文

I have a form in my forms.py that looks like this:

from django import forms

class ItemList(forms.Form):
     item_list = forms.ChoiceField()

I need to populate the item_list with some data from the database. When generated in HTML item_list should be something like:

<select title="ItemList">
   <option value="1">Select Item 1</option>
   <option value="2">Select Item 2</option>
</select>

The options values in my select statement will change almost every time since a variable in the query will often change generating new results.

What do I need to put in the view.py and also in my template files to populate the ItemList with values from the database?

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硬不硬你别怂 2024-10-20 19:49:11

看一下 Django 文档中的这个示例：

http ://docs.djangoproject.com/en/dev/topics/forms/modelforms/#a-full-example

基本上，您可以在 Field 对象上使用 queryset 关键字参数，从数据库中获取行：

class BookForm(forms.Form):
    authors = forms.ModelMultipleChoiceField(queryset=Author.objects.all())

更新

如果您需要动态模型选择字段，您可以在表单的构造函数中移交项目 ID 并相应地调整查询集：

class ItemForm(forms.Form):

    # here we use a dummy `queryset`, because ModelChoiceField
    # requires some queryset
    item_field = forms.ModelChoiceField(queryset=Item.objects.none())

    def __init__(self, item_id):
        super(ItemForm, self).__init__()
        self.fields['item_field'].queryset = Item.objects.filter(id=item_id)

PS 我还没有测试过这个代码，我不确定你的确切设置，但我希望主要思想能够得到体现。

资源：

Take a look at this example in the Django documentation:

http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#a-full-example

Basically, you can use the queryset keyword argument on a Field object, to grab rows from your database:

class BookForm(forms.Form):
    authors = forms.ModelMultipleChoiceField(queryset=Author.objects.all())

Update

If you need a dynamic model choice field, you can hand over your item id in the constructor of the form and adjust the queryset accordingly:

class ItemForm(forms.Form):

    # here we use a dummy `queryset`, because ModelChoiceField
    # requires some queryset
    item_field = forms.ModelChoiceField(queryset=Item.objects.none())

    def __init__(self, item_id):
        super(ItemForm, self).__init__()
        self.fields['item_field'].queryset = Item.objects.filter(id=item_id)

P.S. I haven't tested this code and I'm not sure about your exact setup, but I hope the main idea comes across.

Resources:

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羁绊已千年 2024-10-20 19:49:11

你需要做的是找出你真正想要的对象，例如，如果你想找到一本名为“Upvote-if-u-like!”的书。那么你的 urls.py 应该像

urlpatterns = [
path('textshare/<str:slug>',views.extract,name="textshare"),]

现在一样，当有人搜索 mybook.com/textshare/upvote-if-u-like!/ 时

，他/她会被带到views.py，这看起来就像

def extract(request,slug):
    context={}

    obj=bookForm.objects.get(title=slug)
    form=bookModelForm(instance=obj)

    context={'form':form}
    return render(request,'bookfound.html',context)

bookForm 在 Models.py 中的位置， bookModelForm 在 forms.py 中
快乐的姜戈:)

What you need to do is to find out which object do you actually want for e.g. if you want to find out a book named "Upvote-if-u-like!" then your urls.py should like

urlpatterns = [
path('textshare/<str:slug>',views.extract,name="textshare"),]

now when someone will search for mybook.com/textshare/upvote-if-u-like!/

it will take him/her to views.py which would look like

def extract(request,slug):
    context={}

    obj=bookForm.objects.get(title=slug)
    form=bookModelForm(instance=obj)

    context={'form':form}
    return render(request,'bookfound.html',context)

where bookForm is in Models.py and bookModelForm is in forms.py
Happy Djangoing:)

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