如何从一个Django模型对象获取信息？

Question

today I'm trying to get and print all my users emails, who had chose selection "Value1".

This is how my model.py looks like:

from django.db import models

class Vartotojas(models.Model):
    email = models.EmailField()
    option = models.CharField(max_length=30)

Forms.py :

from django import forms
from emailai.models import Vartotojas

class VartotojasForm(forms.Form):
    email = forms.EmailField(max_length=100)
    my_field = forms.MultipleChoiceField(choices=(('Value1','Value1'),('Value2','Value2')), widget=forms.CheckboxSelectMultiple())

    def save(self):
        mymodel = Vartotojas(
        email=self.cleaned_data['email'],
        option=self.cleaned_data['my_field'],
        )
        mymodel.save()

And finally my views.py "

from django.shortcuts import render
from django.http import HttpResponse
from django.http import HttpResponseRedirect
from emailai.models import Vartotojas
from renginiai.forms import VartotojasForm

def name(request):
    if request.method == 'POST':
        form = VartotojasForm(request.POST)
        if form.is_valid():
            a = Vartotojas.objects.filter(option="u'Value1'") # How to do it right?
            # Now How To Get those object emails?
            new_user = form.save()
            return render(request, "Vartotojas-result.html", {
        'form': form, #BLABLABLA,
    })
    else:
        form = VartotojasForm()
    return render(request, "Vartotojas-form.html", {
        'form': form,
    })

I commented my questions inside my views.py. I hope you will be able to help me. Thank you in advance!

---

I re-write my code with getlist. Now it looks like this:

views.py :

if form.is_valid():
            email = form.cleaned_data['email']
            option = request.POST.getlist('my_field')
            new_user = form.save(email, option)

forms.py:

email = forms.EmailField(max_length=100)
my_field = forms.MultipleChoiceField(choices=(('Value1','Value1'),('Value2','Value2')), widget=forms.CheckboxSelectMultiple())

    def save(self, email, option):
        mymodel = Vartotojas(
        email=email,
        option = option,
        )
        mymodel.save()

As you see I pasted just most important places. By the way, users can choose 2 values, that's why I use checkbox. But still it not working.

Answer 1

I believe you want to use the values_list property like so:

Vartotojas.objects.filter(option=u"Value1").values_list("email", flat=True)

to get a list of all email addresses. You may also want to apply a distinct() to that if you're not already preventing duplicates. On a side note, look into ModelForms : it looks like that would save you a fair bit of the time/ code you have written for dealing with this. You could create a ModelForm based on your Vartotojas object and not have to write the explicit save() method you have.