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?
Take a look at this example in the Django documentation:
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:
来源：https://stackoverflow.com/questions/4789466/populate-a-django-form-with-data-from-database-in-view