Django. Custom views for admin 2

admin.py

from django import forms
from django.db.models import FilteredRelation, Q
from django.urls import path
from django.contrib import admin
from django.contrib.auth import get_user_model
from django.http import HttpResponseRedirect
from django.template.response import TemplateResponse
from django.urls import reverse
from django.utils.http import urlencode
from django.utils.translation import ugettext_lazy as _

from import_export.admin import ExportActionMixin
from import_export.formats.base_formats import CSV, XLSX, XLS, JSON

from apps.accounts.admin import UserAdmin
from apps.accounts.tasks import import_users_to_esputnik
from apps.esputnik.models import UserForImport
from apps.esputnik.resources import UserExportResource
from apps.orders.const import DELIVERED_ORDER
from shared.utils import admin_changelist_url

User = get_user_model()


class ESputnikImportForm(forms.Form):
    users = forms.ModelMultipleChoiceField(
        queryset=User.objects.all(),
        widget=forms.HiddenInput(),
        required=False
    )
    title = forms.CharField(max_length=512, label=_('Название группы'))
    # any other fields

    def make_import(self):
        users = self.cleaned_data['users']
        title = self.cleaned_data['title']
        import_users_to_esputnik.delay(list(users.values_list('id', flat=True)), title)


def esputnik_import(modeladmin, request, queryset):
    data = {'ids': list(queryset.values_list('id', flat=True))}
    url = reverse('admin:esputnik-import')
    return HttpResponseRedirect(
        f"{url}?{urlencode(data, True)}"
    )
esputnik_import.short_description = _('Esputnik import')


@admin.register(UserForImport)
class ImportUserAdmin(ExportActionMixin):
    # other admin staff
    actions = [esputnik_import]

    def get_urls(self):
        urls = super().get_urls()
        # register view
        custom_urls = [
            path(
                'esputnik/import/',
                self.admin_site.admin_view(self.esputnik_import),
                name='esputnik-import',
            )
        ]
        return custom_urls + urls

    def esputnik_import(self, request, **kwargs):
        if request.method != 'POST':
            form = ESputnikImportForm()
        else:
            data = request.POST.copy()
            data['users'] = request.GET.getlist('ids', [])
            form = ESputnikImportForm(data)
            
            if form.is_valid():
                form.make_import()
                self.message_user(request, _('Success. Users are imported.'))
                return HttpResponseRedirect(admin_changelist_url(UserForImport))
              
        context = self.admin_site.each_context(request)
        context['opts'] = self.model._meta
        context['form'] = form
        context['title'] = _('E-Sputnik import')
        return TemplateResponse(
            request,
            'admin/custom_action_form.html',
            context,
        )

custom_action_form.html

{% extends "admin/change_form.html" %}
{% load i18n admin_static admin_modify %}
{% block content %}
<div id="content-main">
  <form action="" method="POST">
    {% csrf_token %}

    {% if form.non_field_errors|length > 0 %}
      <p class="errornote">
          "Please correct the errors below."
      </p>
      {{ form.non_field_errors }}
    {% endif %}

    {% for hidden_field in form.hidden_fields %}
      {% if hidden_field.errors %}
        <ul>
          {% for error in hidden_field.errors %}
            <li>(Hidden field {{ hidden_field.name }}) {{ error }}</li>
          {% endfor %}
        </ul>
      {% endif %}
      {{ hidden_field }}
    {% endfor %}

    <fieldset class="module aligned">
      {% for field in form.visible_fields %}
        <div class="form-row">
          {{ field.errors }}
          {{ field.label_tag }}
          {{ field }}
          {% if field.field.help_text %}
          <p class="help">
            {{ field.field.help_text|safe }}
          </p>
          {% endif %}
        </div>
      {% endfor %}
    </fieldset>
    <div class="submit-row">
      <input type="submit" class="default" value="Submit">
    </div>
  </form>
</div>
{% endblock %}