在视图中使用数据库中的数据填充Django表单 [英] Populate a django form with data from database in view

问题描述

我的form.py中有一个看起来像这样的表单：

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

from django import forms

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

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

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>

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更改生成新结果。

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

我需要在view.py和模板文件中放入哪些内容，以便使用数据库中的值填充ItemList？

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?

推荐答案

在Django文档中查看以下示例：

Take a look at this example in the Django documentation:

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

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

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

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())

---

更新

如果需要一个动态模型选择字段，您可以将您的商品ID移交给表单的构造函数，并相应地调整查询集：

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)

聚苯乙烯我尚未测试此代码，也不确定您的确切设置，但希望能理解主要思想。

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.

资源：

• http://www.mail-archive.com/[e-mail]/msg48058.html


• http://docs.djangoproject.com/en/dev/ref/forms/fields/#django。 form.ModelChoiceField

• http://www.mail-archive.com/[e-mail]/msg48058.html
• http://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.ModelChoiceField

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