I have a class-based view ( IndexView at views.py ) that shows a table with all the data stored in the database. This view is rendered in index.html using a def get_queryset(self)
to obtain all the data. No issues yet.
The difficult part for me is trying to do it using a form, to be able to modify and save the amount column. I have no issues with the POST part, where I use AJAX to save the new values. Where I'm having issues is getting the initial values from the database to populate a Django Form ( forms.py )
I tried using initial
argument in the definition of the form fields (at forms.py ), even overriding __init__
at the form definition, but I don't know how to get "one value" . I mean, the closer I've been in my tests was populating a MultipleChoiceField with: forms.ModelMultipleChoiceField(queryset=Item.objects.order_by('code__name'))
(achieving a multiple choice field of Item object (1), Item object (2), etc.
)
But how do you populate a single IntegerField or CharField with the content of the database to show a form-based table field in the template?
I'm trying first with a single item (to try to understand how to reference one item/value to populate them using the database) before doing it with the whole table:
index.hml:
...
<form class='my-ajax-form' method='POST' action='.' data-url='{{ request.build_absolute_uri|safe }}'>
{% csrf_token %}
{{form.as_table|safe}}
<button type='submit'>Save changes</button>
</form>
...
models.py :
class Code(models.Model):
name = models.CharField(max_length=6)
description = models.CharField(max_length=100)
def __str__(self):
return self.name
class Item(models.Model):
code = models.ForeignKey(Code, on_delete=models.DO_NOTHING)
amount = models.IntegerField(default=0)
forms.py:
class ItemForm(forms.Form):
code = forms.CharField(max_length=6)
description = forms.CharField(max_length=100)
amount = forms.IntegerField()
views.py:
class IndexView(generic.ListView, AjaxFormMixin, FormView):
template_name = 'inventory/index.html'
context_object_name = 'items_list'
form_class = ItemForm
def form_invalid(self, form):
...
def form_valid(self, form):
...
def get_queryset(self):
...
I checked these docs & some similar old issues, but I tried some of the suggestions/examples with no success:
I'm using Django 2.0.2
Any help would be appreciated. Thanks in advance.
EDIT: Trying to do something using UpdateView as andi suggests. Added (trying to get one value by id):
class ItemUpdate(UpdateView):
form_class = JoinForm
def get_object(self,queryset=None):
obj = Item.objects.get(id=self.kwargs['2'])
return obj
And pointed url to path('', views.ItemUpdate.as_view(), name='index')
but always get KeyError: '2'
what about using generic from django.views.generic.edit import UpdateView
straight on model?
https://docs.djangoproject.com/en/2.0/ref/class-based-views/generic-editing/#updateview
views.py:
from django.forms import ModelForm, CharField, Textarea
from django.urls import reverse_lazy
from django.views.generic import UpdateView
from demo.models import Item
class ItemForm(ModelForm):
description = CharField(widget=Textarea)
class Meta:
model = Item
fields = ['code', 'amount']
def save(self, commit=True):
item = super(ItemForm, self).save(commit=commit)
item.code.description = self.cleaned_data['description']
item.code.save()
def get_initial_for_field(self, field, field_name):
if field_name == 'description':
return self.instance.code.description
else:
return super(ItemForm, self).get_initial_for_field(field, field_name)
class ItemUpdateView(UpdateView):
form_class = ItemForm
model = Item
def get_success_url(self):
return reverse_lazy('item-detail', kwargs={'pk': 1})
urls.py
from django.conf.urls import url
from django.contrib import admin
from django.urls import path
from demo.views import ItemUpdateView
urlpatterns = [
url(r'^admin/', admin.site.urls),
path(r'items/<int:pk>/', ItemUpdateView.as_view(), name='item-detail')
]
/templates/demo/item_form.html
<form action="" method="post">{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Update" />
</form>
If something regarding settings or config is unclear please refer to the repo with demo: https://github.com/andilabs/cbv
added modelformset producing what you need in ListView
from django.forms import modelformset_factory
class ItemListView(ListView):
model = Item
def get_context_data(self, **kwargs):
data = super(ItemListView, self).get_context_data()
formset = modelformset_factory(Item, form=ItemForm)()
data['formset'] = formset
return data
this just displays data in forms, you have take care of rest.
There are multiple ways of loading data into forms, as far as I know:
You are using FormView
CBV which has a func called get_intial
:
def get_initial(self):
initial = super().get_initial()
initial['<form-field>'] = <initial-value>
return initial
You can override the init func:
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['<form-field>'].initial = <initial-value>
您可以做的一件事是遍历项目列表,并将每个字段的输入标签的 value 属性设置为 form.field_name.value
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