when i try to create a blog post is shows not null constraint failed: blog_blog.id

Question

when i try to create a blog post is shows not null constraint failed: blog_blog.id and i have tried everything possible to fix this and it still not working i dont know if i should add and id field in my models.py let me show my code

models.py

# some field are commented out because i was trying them to see if it would work
class Blog(models.Model):
    id = models.UUIDField(primary_key=True, editable=False)
    title = models.CharField(max_length=10000, null=True, blank=True, verbose_name="Title")
    content = models.TextField(verbose_name="Post Content")
    # slug = models.SlugField(unique=True)
    image = models.ImageField(upload_to="blog-images/%Y/%m/%d/", verbose_name="Post Thumbnail")
    category = models.ForeignKey(Category, on_delete=models.DO_NOTHING, verbose_name="Category", null=True)
    tags = models.ManyToManyField(Tag, related_name='tags', verbose_name="Tag")
    status = models.CharField(choices=STATUS_CHOICE, default="published", max_length=150, verbose_name='Status')
    creator = models.ForeignKey(User, on_delete=models.DO_NOTHING, verbose_name="Creator", null=True)
    created = models.DateTimeField(auto_now_add=True ,verbose_name="Created", null=True)

    def get_absolute_url(self):
        # return reverse('blog:blog-details', args=[self.slug])
        return reverse('blog:blog-details', kwargs={'pk': self.pk})
    
    class Meta:
        verbose_name = "Blog Post"
        verbose_name_plural = "Blog Posts"
    
    def __str__(self):
        return self.title

views.py

def blogpost(request):
    if request.method == "POST":
        form = BlogPostForm(request.POST, request.FILES)
        if form.is_valid():
            form = form.save(commit=False)
            form.creator = request.user
            form.save()
            messages.success(request, f'Hi, Your Post have been sent for review and would be live soon!')
            return redirect('blog:home')
    else:
        form = BlogPostForm()

    context = {
        "form": form
    }
    return render(request, 'blog/AddPost.html', context)

urls.py

path('', views.blog_list, name="home"),
    path('post/<int:pk>', views.blog_detail, name="blog-details"),
    path('post/categories/<slug:category_slug>', views.category, name="category"),
    path('post/tags/<slug:tag_slug>', views.tag, name="tags"),

    path('post/create/', views.blogpost, name="add-post"),

forms.py

class BlogPostForm(forms.ModelForm):
    image = forms.ImageField(widget=forms.ClearableFileInput(attrs={'multiple': True}), required=True)
    # content = forms.CharField(widget=forms.Textarea(attrs={'class': 'input is-medium'}), required=True)
    tags = forms.CharField(widget=forms.TextInput(attrs={'class': 'input is-medium'}), required=True)

    class Meta:
        model = Blog
        fields = ('title', 'content', 'image', 'category', 'tags')

addpost.html

<form action="" method="POST" enctype="multipart/form-data">
                            {% csrf_token %}
                            {{form|crispy}}
                        <div class="form-group">
                            <button class="btn theme-bg rounded" type="submit">Send Message</button>
                        </div>
                        </form>

this is my complete trace back and there is a comment with the recent error i'm getting any help would be appreciated

System check identified no issues (0 silenced).
November 18, 2021 - 22:48:00
Django version 3.2.9, using settings 'dexxapikprj.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
[18/Nov/2021 22:48:02] "GET /blog/post/create/ HTTP/1.1" 200 23653
[18/Nov/2021 22:48:03] "GET /static/assets/fonts/themify.ttf?-fvbane HTTP/1.1" 404 1940
Internal Server Error: /blog/post/create/
Traceback (most recent call last):
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\db\models\fields\__init__.py", line 1823, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: 'd'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\Destiny\Desktop\DexxaPik\dexxapikprj\blog\views.py", line 44, in blogpost
    form.save()  # ← no commit=False
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\forms\models.py", line 469, in save
    self._save_m2m()
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\forms\models.py", line 451, in _save_m2m
    f.save_form_data(self.instance, cleaned_data[f.name])
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\db\models\fields\related.py", line 1668, in save_form_data
    getattr(instance, self.attname).set(data)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\db\models\fields\related_descriptors.py", line 1007, in set
    else self.target_field.get_prep_value(obj)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\db\models\fields\related.py", line 977, in get_prep_value
    return self.target_field.get_prep_value(value)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\db\models\fields\__init__.py", line 1825, in get_prep_value
    raise e.__class__(
ValueError: Field 'id' expected a number but got 'd'.
[18/Nov/2021 22:48:12] "POST /blog/post/create/ HTTP/1.1" 500 97645
[18/Nov/2021 22:48:38] "GET /admin/blog/blog/ HTTP/1.1" 200 14076
[18/Nov/2021 22:48:38] "GET /admin/jsi18n/ HTTP/1.1" 200 3195
[18/Nov/2021 22:48:41] "GET /admin/blog/blog/c9f112b3-e108-4605-9c5b-edb952781045/change/ HTTP/1.1" 200 17761
[18/Nov/2021 22:48:41] "GET /admin/jsi18n/ HTTP/1.1" 200 3195
[18/Nov/2021 22:48:41] "GET /admin/jsi18n/ HTTP/1.1" 200 3195
[18/Nov/2021 22:48:50] "GET /admin/ HTTP/1.1" 200 14858
[18/Nov/2021 22:48:52] "GET /admin/blog/blog/ HTTP/1.1" 200 14076
[18/Nov/2021 22:48:52] "GET /admin/jsi18n/ HTTP/1.1" 200 3195
Internal Server Error: /blog/
Traceback (most recent call last):
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\Destiny\Desktop\DexxaPik\dexxapikprj\blog\views.py", line 65, in blog_list
    return render(request, 'blog/bloghome.html', context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\backends\django.py", line 61, in render
    return self.template.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 170, in render
    return self._render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 162, in _render
    return self.nodelist.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 162, in _render
    return self.nodelist.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\defaulttags.py", line 211, in render
    nodelist.append(node.render_annotated(context))
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\template\base.py", line 858, in _resolve_lookup
    current = current()
  File "C:\Users\Destiny\Desktop\DexxaPik\dexxapikprj\blog\models.py", line 58, in get_absolute_url
    return reverse('blog:blog-details', kwargs={'pk': self.pk})
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\urls\base.py", line 86, in reverse
    return resolver._reverse_with_prefix(view, prefix, *args, **kwargs)
  File "C:\Users\Destiny\Desktop\DexxaPik\venv\lib\site-packages\django\urls\resolvers.py", line 694, in _reverse_with_prefix
    raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'blog-details' with keyword arguments '{'pk': UUID('c9f112b3-e108-4605-9c5b-edb952781045')}' not found. 1 pattern(s) tried: ['blog/(?P<post_id>[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})$']
[18/Nov/2021 22:48:57] "GET /blog/ HTTP/1.1" 500 200505

any help would be appreciated

Answer 1

Since the primary key is not an AutoField or BigAutoField it will not automatically assign a value.

You should specify a function that can generate random UUIDs. You can for example make use of the uuid4() function [Python-doc]:

from uuid import uuid4

class Blog(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
    # …

Note that because you do not save the object with the form, it will not store ManyToManyFields of the created object like tags for example. You can rewrite the view to:

def blogpost(request):
    if request.method == "POST":
        form = BlogPostForm(request.POST, request.FILES)
        if form.is_valid():
            form.instance.creator = request.user
            form.save()  # ← no commit=False
            messages.success(request, f'Hi, Your Post have been sent for review and would be live soon!')
            return redirect('blog:home')
    else:
        form = BlogPostForm()

    context = {
        'form': form
    }
    return render(request, 'blog/AddPost.html', context)