lesson 50

core/urls.py

@@ -27,6 +27,6 @@ urlpatterns = [
     # /articles/1/ OR /articles/?id=1
     # article_details_view(request, id)
     path('articles/<int:id>/', views.ArticleDetailView.as_view(), name='articles-detail'),
-    path('articles/<int:id>/edit', views.article_update_view, name='article_update'),
+    path('articles/<int:id>/edit', views.ArticleUpdateView.as_view(), name='article_update'),
     path('articles/<int:id>/delete', views.delete_article, name='delete_article')
 ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

core/validators.py

+from django.forms import ValidationError
+
+
+def at_least_5(v):
+    if len(v) < 5:
+        raise ValidationError(
+            'This field should be at least %(length)d symbols long',
+            code='too_short',
+            params={'length': 5}
+        )

reqs.txt

 asgiref==3.7.2
 Django==3.2.19
+django-extensions==3.2.3
 pytz==2023.3
 sqlparse==0.4.4

web/forms.py

 from django import forms
-from django.forms import widgets
+from django.forms import widgets, ValidationError
 
+from core.validators import at_least_5
 from web.models import Article
 
 
@@ -22,3 +23,10 @@ class ArticleModelForm(forms.ModelForm):
             'text': forms.Textarea(attrs={'class': 'form-control mb-3'}),
             'tags': forms.CheckboxSelectMultiple(attrs={'class': 'mb-3'})
         }
+
+    def clean(self):
+        cleaned_data = super().clean()
+        if cleaned_data.get('text') == cleaned_data.get('title'):
+            raise ValidationError('Text of the article should not duplicate it\'s title')
+
+        return cleaned_data

web/migrations/0012_alter_article_title.py

+# Generated by Django 3.2.19 on 2023-07-13 11:12
+
+import core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('web', '0011_auto_20230710_1818'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='article',
+            name='title',
+            field=models.CharField(max_length=200, validators=[core.validators.at_least_5], verbose_name='Заголовок'),
+        ),
+    ]

web/models/article.py

 from django.db import models
 from django.db.models import TextChoices
+from django.core.validators import MinLengthValidator
 
 
 class StatusChoices(TextChoices):
@@ -15,7 +16,10 @@ class Article(models.Model):
         max_length=200,
         null=False,  # <null>
         blank=False,  # ''
-        verbose_name='Заголовок'
+        verbose_name='Заголовок',
+        validators=[
+            MinLengthValidator(5)
+        ]
     )
 
     tags = models.ManyToManyField('web.Tag', related_name='articles', blank=True)

web/views.py

 from django.shortcuts import render, redirect, get_object_or_404
 from django.urls import reverse
-from django.views.generic import View, TemplateView, RedirectView
+from django.views.generic import View, TemplateView, RedirectView, FormView
 from web.forms import ArticleForm, ArticleModelForm
 from web.models import Article, StatusChoices
 
@@ -56,6 +56,34 @@ class ArticleDetailView(TemplateView):
         article = get_object_or_404(Article, id=kwargs.get('id'))
         return super().get_context_data(article=article)
 
+
+class ArticleUpdateView(FormView):
+    template_name = 'update.html'
+    form_class = ArticleModelForm
+
+    def dispatch(self, request, *args, **kwargs):
+        self.article = get_object_or_404(self.form_class.Meta.model, id=kwargs.get('id'))
+        return super().dispatch(request, *args, **kwargs)
+
+    def get_context_data(self, **kwargs):
+        return super().get_context_data(article=self.article, **kwargs)
+
+    def get_initial(self):
+        initial = self.article.__dict__
+        initial['tags'] = self.article.tags.all()
+        return initial
+
+    def get_form_kwargs(self):
+        return super().get_form_kwargs() | {'instance': self.article}
+
+    def form_valid(self, form):
+        form.save()
+        return super().form_valid(form)
+
+    def get_success_url(self):
+        return reverse('articles-detail', kwargs={'id': self.article.id})
+
+
 def article_update_view(request, id):
     article = get_object_or_404(Article, pk=id)
     if request.method == 'GET':