create delete view, which check if object has related objects

city/forms.py

@@ -111,9 +111,10 @@ class CityForm(forms.Form):
     def clean(self):
         id = self.cleaned_data.get('city_id')
         name_ru = self.cleaned_data.get('name_ru')
-        c = City.objects.get(pk=id)
+        country = self.cleaned_data.get('country')
+
         city = City.objects.filter(
-            url='%s-%s'%(translit_with_separator(c.country.name), translit_with_separator(name_ru))
+            url='%s-%s'%(translit_with_separator(country.name), translit_with_separator(name_ru))
         )
         if city and str(city[0].id) != id:
             msg = 'Город с таким названием уже существует'
@@ -145,4 +146,11 @@ class CityForm(forms.Form):
         """
         cleaned_data = super(CityForm, self).clean()
         population = cleaned_data.get('population').strip()
-        return is_positive_integer(population)
+        return is_positive_integer(population)
+
+class CityDeleteForm(forms.ModelForm):
+    url = forms.CharField(widget=forms.HiddenInput())
+
+    class Meta:
+        model = City
+        fields = ('url',)

city/models.py

@@ -32,10 +32,12 @@ class City(TranslatableModel):
     services = BitField(flags=flags)
 
     url = models.SlugField(unique=True)
-    country = models.ForeignKey('country.Country', null=True, on_delete=models.PROTECT)
+    #relations
+    country = models.ForeignKey('country.Country', null=True, on_delete=models.PROTECT, related_name='cities')
+    code_IATA = models.ForeignKey(Iata, blank=True, null=True)
+
     population = models.PositiveIntegerField(blank=True, null=True)
     phone_code = models.PositiveIntegerField(blank=True, null=True)
-    code_IATA = models.ForeignKey(Iata, null=True)
     #translated fields
     translations = TranslatedFields(
         name = models.CharField(max_length=50),

city/urls.py

@@ -1,8 +1,9 @@
 # -*- coding: utf-8 -*-
 from django.conf.urls import patterns, url
 
-urlpatterns = patterns('',
-    url(r'^add/$', 'city.views.city_add'),
-    url(r'^change/(.*)/$', 'city.views.city_change'),
-    url(r'^all/$', 'city.views.city_all'),
+urlpatterns = patterns('city.views',
+    url(r'^add/$', 'city_add'),
+    url(r'^delete/(?P<url>.*)/$', 'city_delete'),
+    url(r'^change/(.*)/$', 'city_change'),
+    url(r'^all/$', 'city_all'),
 )

city/views.py

@@ -6,12 +6,12 @@ from django.conf import settings
 from django.contrib.auth.decorators import login_required
 from django.contrib.contenttypes.models import ContentType
 #models and forms
-from forms import CityForm
+from forms import CityForm, CityDeleteForm
 from models import City
 from file.models import FileModel
 from file.forms import FileModelForm
 #custom views
-from functions.custom_views import objects_list, add_object_with_file
+from functions.custom_views import objects_list, add_object_with_file, delete_object
 
 
 def city_all(request):
@@ -28,6 +28,9 @@ def city_add(request):
     """
     return add_object_with_file(request, CityForm, 'city_add.html', '/city/all')
 
+def city_delete(request, url):
+    return delete_object(request, City, CityDeleteForm, url, '/city/all/')
+
 
 @login_required
 def city_change(request, url):

country/forms.py

@@ -225,3 +225,10 @@ class CountryForm(forms.Form):
         cleaned_data = super(CountryForm, self).clean()
         time_delivery = cleaned_data.get('time_delivery').strip()
         return is_positive_integer(time_delivery)
+
+class CountryDeleteForm(forms.ModelForm):
+    url = forms.CharField(widget=forms.HiddenInput())
+    
+    class Meta:
+        model = Country
+        fields = ('url',)

country/models.py

@@ -31,14 +31,17 @@ class Country(TranslatableModel):
     REGIONS =('europa', 'asia', 'america', 'africa')
 
     url = models.SlugField(unique=True)
+    #relations
+    big_cities = models.ManyToManyField(City, blank=True, null=True, related_name='cities')
     capital = models.ForeignKey(City,blank=True, null=True, on_delete=models.PROTECT, related_name='capital')
+    language = models.ManyToManyField(Language, blank=True, null=True)
+    currency = models.ManyToManyField(Currency, blank=True, null=True)
+
     population = models.PositiveIntegerField(blank=True, null=True)
     teritory = models.PositiveIntegerField(blank=True, null=True)
     timezone = models.FloatField(blank=True, null=True)
     phone_code = models.PositiveIntegerField(blank=True, null=True)
-    big_cities = models.ManyToManyField(City, blank=True, null=True, related_name='cities')
-    language = models.ManyToManyField(Language, blank=True, null=True)
-    currency = models.ManyToManyField(Currency, blank=True, null=True)
+
     time_delivery = models.PositiveSmallIntegerField(blank=True, null=True)
     #
     region = EnumField(values=REGIONS)

country/urls.py

@@ -3,7 +3,7 @@ from django.conf.urls import patterns, include, url
 
 urlpatterns = patterns('country.views',
     url(r'^add.*/$', 'country_add'),
-    url(r'^delete/(.*)/$', 'country_delete'),
-    url(r'^change/(.*)/$', 'country_change'),
+    url(r'^delete/(?P<url>.*)/$', 'country_delete'),
+    url(r'^change/(?P<url>.*)/$', 'country_change'),
     url(r'^all/$', 'country_all'),
 )

country/views.py

@@ -9,11 +9,14 @@ from django.db.models.loading import get_model
 from django.core.paginator import Paginator, PageNotAnInteger, EmptyPage
 #models and forms
 from models import Country
-from forms import CountryForm
+from forms import CountryForm, CountryDeleteForm
 from file.models import FileModel, TmpFile
 from file.forms import FileModelForm
 #custom views
-from functions.custom_views import objects_list, add_object_with_file
+from functions.custom_views import objects_list, add_object_with_file, delete_object
+
+from django.db.models.deletion import ProtectedError
+
 
 def country_all(request):
     """
@@ -28,37 +31,9 @@ def country_add(request):
     """
     return add_object_with_file(request, CountryForm, 'country_add.html', '/country/all/')
 
-def country_delete(request, url):
-    try:
-        c = Country.objects.get(url=url)
-        country_id = getattr(c, 'id')
-    except:
-        return HttpResponseRedirect('/country/all')
-    c.delete()
-
-    return objects_list(request, Country, 'country_all.html')
-
-
-
-def objects_list(request, Model, template, item_per_page=10):
-    """
-    Return template with all objects of model Model
-    Model - objects Model
-    item_per_page - how many objects view in the one page
-    """
-    list = Model.objects.all()
-    paginator = Paginator(list, item_per_page)
-    page = request.GET.get('page')
-    try:
-        objects = paginator.page(page)
-    except PageNotAnInteger:
-    # If page is not an integer, deliver first page.
-        objects = paginator.page(1)
-    except EmptyPage:
-    # If page is out of range (e.g. 9999), deliver last page of results.
-        objects = paginator.page(paginator._num_pages)
-    return render_to_response(template, {'objects': objects})
 
+def country_delete(request, url):
+    return delete_object(request, Country, CountryDeleteForm, url, '/country/all/')
 
 
 @login_required

functions/custom_views.py

@@ -5,6 +5,7 @@ from django.core.context_processors import csrf
 from django.conf import settings
 from django.contrib.auth.decorators import login_required
 from django.core.paginator import Paginator, PageNotAnInteger, EmptyPage
+from django.db.models.deletion import ProtectedError
 #forms and models
 from file.forms import FileModelForm
 from file.models import TmpFile
@@ -123,4 +124,29 @@ def add_object_with_file(request, Form, template, redirect_string, choices={}):
     #list of files connected to this form
     args['files'] = TmpFile.objects.filter(key=key)
 
-    return render_to_response(template, args)
+    return render_to_response(template, args)
+
+@login_required
+def delete_object(request, Model, Form, url, prev_page,):
+    if request.GET:
+        url = request.GET.get('url')
+        object = Model.objects.get(url=url)
+        try:
+            object.delete()
+            return HttpResponseRedirect(prev_page)
+        except ProtectedError:
+            msg = 'Удаления %s требует удаления связаных объектов'%object
+            return render_to_response('delete.html', {'msg':msg, 'prev_page':prev_page})
+
+    else:
+        object = Model.objects.get(url=url)
+        form = Form(instance=object)
+
+    args = {}
+    args.update(csrf(request))
+
+    args['form'] = form
+    args['country'] = object
+    args['prev_page'] = prev_page
+
+    return render_to_response('delete.html', args)

templates/admin/city/city_all.html

@@ -29,6 +29,9 @@ Displays lists of all cities in the table
                   <a class="btn btn-info" href="/city/change/{{ item.url|lower }}">
                   <i class="icon-edit icon-white"></i> Изменить
                   </a>
+                  <a class="btn btn-danger delete" href="/city/delete/{{ item.url }}/">
+                  <i class="icon-trash icon-white"></i> Удалить
+                  </a>
               </td>
 			</tr>
           {% endfor %}

templates/admin/country/country_all.html

@@ -31,7 +31,7 @@ Displays lists of all countries in the table
                   <a class="btn btn-info" href="/country/change/{{ item.url|lower }}">
                   <i class="icon-edit icon-white"></i> Изменить
                   </a>
-                  <a class="btn btn-danger" href="/country/delete/{{ item.url }}">
+                  <a class="btn btn-danger delete" href="/country/delete/{{ item.url }}/">
                   <i class="icon-trash icon-white"></i> Удалить
                   </a>
               </td>
@@ -72,5 +72,6 @@ Displays lists of all countries in the table
 
     </div>
 </div>
+</div>
 
 {% endblock %}

templates/delete.html

@@ -0,0 +1,20 @@
+{% extends 'base.html'  %}
+
+{% block body %}
+    {% if form %}
+    <form>
+        <p>Вы действительно хотите удалить <b>{{ object }}</b>?</p><br>
+        {{ form.url }}
+
+        <input type="submit" class="btn-primary" value="Да">
+        <a class="btn" href="{{ prev_page }}">Нет</a>
+    </form>
+    {% else %}
+        {{ msg }}
+        <br>
+        <a href="{{ prev_page }}">Вернуться</a>
+
+
+    {% endif %}
+
+{% endblock %}