Populate a django form with data from database in view - django

Question

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?

Answer 1

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:
http://www.mail-archive.com/django-users#googlegroups.com/msg48058.html
http://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.ModelChoiceField

Answer 2

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:)