python - 将数据从视图传递到 django 中的表单

Question

我有一个 django formtool：它需要插入名称并从 MultipleChoiceField 中选择 N 个值的第一步。当用户在第二步中提交此表单时，我需要显示 N MultipleChoiceField，其中每个 MultipleChoiceField 的每个元素都是从数据库中检索的。

我需要获取第一步表单的值，从 Db 中检索数据并将这些数据发送到第二步（forms.py）。对于第二步，我想我需要一个表单集。我已经阅读了一些关于将值从视图传递到表单的问题，但任何解决方案。这是我的代码：

表格.py

from django import forms
from station.models import Station
from django.forms import formset_factory
from .models import Vdl


station_all=Station.objects.all()


class VdlSelectStationsForm(forms.Form):
    vdl_name = forms.CharField(label='nome virtual data logger', max_length=20,
                                 widget=forms.TextInput(attrs={'class': 'form-control', 'placeholder': 'nome vdl'}))
    
    stations = forms.ModelMultipleChoiceField(queryset=station_all)
    

class VdlSelectSensorsForm(forms.Form):
    sensor_list_for_station = forms.ModelMultipleChoiceField(queryset=Vdl.objects.all())   #filter(id_user = id_user))


VdlSelectSensorsForm = formset_factory(VdlSelectSensorsForm, extra=1)

视图.py

from django.shortcuts import render
from .forms import VdlSelectStationsForm, VdlSelectSensorsForm
from formtools.wizard.views import SessionWizardView


class VdlWizard(SessionWizardView):
    template_name = "vdl.html"
    form_list = [VdlSelectStationsForm, VdlSelectSensorsForm]

    def get_form_initial(self, step):
        initial = {}

        # If at second step, add image path to initial data for canvas field
        if step == '1':
            first_step_data = self.storage.get_step_data('0')
            print('first_step_data ', first_step_data['0-stations'])

            form = VdlSelectSensorsForm(initial={"form_field": first_step_data})

            def initial_value(request):
                my_values = [1, 2, 3]
                return my_values
                initial_value(request, my_values)

        return self.initial_dict.get(step, initial)

    def parse_params(self, request, *args, **kwargs):
        current_step = self.determine_step(request, *args, **kwargs)
        if request.method == 'POST' and current_step == 0:
            form = self.get_form(current_step, request.POST)
            if form.is_valid():
                self.initial[(current_step + 1)] = {
                    'vdl_name': form.cleaned_data['vdl_name'],
                    'stations': form.cleaned_data['stattions'],
                }

    def done(self, form_list, **kwargs):
        form_data = process_form_data(form_list)

        context = {
            'form_data': form_data,
        }

        return render(self.request, 'vdl.html', {'form_data': [form.cleaned_data for form in form_list],})

def process_form_data(form_list):
    form_data = [form.cleaned_data for form in form_list]

    return form_data

vdl.html

{% extends "base.html" %}
{% load i18n %}

{% block content %}
<p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
{% for field in form %}
    {{field.error}}
{% endfor %}


<form action="" method="post">
  {% csrf_token %}
  <table>
  {{ wizard.management_form }}
  {% if wizard.form.forms %}
    {{ wizard.form.management_form }}
    {% for form in wizard.form.forms %}
      {{ form }}
    {% endfor %}
  {% else %}
    {{ wizard.form }}
  {% endif %}
  </table>
  {% if wizard.steps.prev %}
  <button name="wizard_goto_step" type="submit" value="{{ wizard.steps.first }}">{% trans "first step" %}</button>
  <button name="wizard_goto_step" type="submit" value="{{ wizard.steps.prev }}">{% trans "prev step" %}</button>
  {% endif %}
  <input type="submit" value="Invia"/>
</form>


{% endblock %}

模型.py

from django.db import models

class Vdl(models.Model):
    id_vdl = models.IntegerField(primary_key=True, unique=True)
    vdl_name = models.CharField(blank=False, max_length=20)
    id_vdl_station = models.CharField(blank=False, max_length=100)
    id_user = models.IntegerField()

    class Meta:
        db_table = 'vdl'

标签： pythondjangoformsdjango-formsdjango-formtools