Saturday, April 27, 2019

Re: Question about form_valid: how to automatically set multiple fields when users input data via CreateView supported form?

Hi, Britto,

Thank you very much for your reply!
I tried form.instance.article = self.request.POST.get('article'), I still got an error shown below.

 
RelatedObjectDoesNotExist at /articles/2/comment/
Comment has no article.
Request Method:POST
Request URL:http://127.0.0.1:8000/articles/2/comment/
Django Version:2.1.5
Exception Type:RelatedObjectDoesNotExist
Exception Value:
Comment has no article.
Exception Location:/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py in __get__, line 188
Python Executable:/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/bin/python
Python Version:3.6.5

 

When I tried print(dir(self.request.POST)), I got the below.

 
['__class__', '__contains__', '__copy__', '__deepcopy__', '__delattr__', '__delitem__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__setstate__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_assert_mutable', '_encoding', '_getlist', '_mutable', 'appendlist', 'clear', 'copy', 'dict', 'encoding', 'fromkeys', 'get', 'getlist', 'items', 'keys', 'lists', 'pop', 'popitem', 'setdefault', 'setlist', 'setlistdefault', 'update', 'urlencode', 'values']
 

When I tried print(self.request.POST.items), I got the blow, for example.

 
<bound method MultiValueDict.items of <QueryDict: {'csrfmiddlewaretoken': ['qRGlWdPTX9qxpFidwKT8bvY3vWXx5caE2wJZSQTtyWodYSICmW4yMwXG3FAn9oQk'], 'comment': ['I am maru'], 'article': ['2']}>>

 
I typed the message ('I am maru') and needed to specify the article that I made the message to. I needed to set fields = ('comment','article',) in CommentCreateView, otherwise, I get an error like the below.

 
RelatedObjectDoesNotExist at /articles/2/comment/
Comment has no article.
Request Method:POST
Request URL:http://127.0.0.1:8000/articles/2/comment/
Django Version:2.1.5
Exception Type:RelatedObjectDoesNotExist
Exception Value:
Comment has no article.
Exception Location:/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py in __get__, line 188
Python Executable:/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/bin/python

 

I tried other listed attributes, but seems like I could not find 'article' information.
When I set the article field and choose an article, I get like 'article':  ['2'].

Regarding user, by adding form.instance.author = self.request.user, 'author' was automatically set without choosing it in the form. But, I did not see any author information when I tried several print(self.request.POST.XXX) thing.

When I tried print(self.request.user), the user was printed in terminal.
But, when I tried print(self.request.POST.user), I got an error like below.

 
AttributeError at /articles/2/comment/
'QueryDict' object has no attribute 'user'
Request Method:POST
Request URL:http://127.0.0.1:8000/articles/2/comment/
Django Version:2.1.5
Exception Type:AttributeError
Exception Value:
'QueryDict' object has no attribute 'user'

 
When I set the article field, and choose an article in the comment form, I tried print(form.instance.article). Then, the article I chose was printed in the terminal.
So, seems like form.instance.article is correct.

But how can I set the right part?
form.instance.article = self.response.XXXXX???

Where is the user information?
I successfully can access to user by self.request.user, but currently I have no idea how to access to article information.

Sorry, any advice I can try would be really appreciated!

Looking forward to hearing advice.

Best regards,

Nori

On Saturday, April 27, 2019 at 10:41:14 PM UTC-4, SimpleHumble wrote:
The best way to debug it is add a print function with dir function just before the error occurring line and see what are available attributes in request.POST object like this print(dir("========", request.POST, "========")) . Also without dir function will show what is available in POST.
Look at the terminal after running development server and your action to trigger error, see what are the attributes available for your request.

Probably you have to set form.instance.article = request.POST.get('article') would work.

Regards
Britto


On Sun, 28 Apr 2019 at 02:56, Atsunori Kaneshige <atsu...@umich.edu> wrote:
Sorry, when I make a comment, I get this error.

Any advice would be really appreciated!



AttributeError at /articles/2/comment/

'WSGIRequest' object has no attribute 'article'
Request Method:POST
Request URL:http://127.0.0.1:8000/articles/2/comment/
Django Version:2.1.5
Exception Type:AttributeError
Exception Value:
'WSGIRequest' object has no attribute 'article'
Exception Location:/Users/Koitaro/Desktop/Web_Development/MMBlog/articles/views.py in form_valid, line 75
Python Executable:/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/bin/python
Python Version:3.6.5
Python Path:
['/Users/Koitaro/Desktop/Web_Development/MMBlog',   '/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python36.zip',   '/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python3.6',   '/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python3.6/lib-dynload',   '/Applications/anaconda3/lib/python3.6',   '/Users/Koitaro/.local/share/virtualenvs/MMBlog-58h299OP/lib/python3.6/site-packages']
Server time:Sat, 27 Apr 2019 21:24:45 +0000


On Saturday, April 27, 2019 at 5:07:19 PM UTC-4, Atsunori Kaneshige wrote:
I really appreciate if anybody could give me an advice about form_valid.

Here is what I want to do.
I am making a simple blog.
I am making simple features:
1) only superuser can create articles.
2) logged-in users can make comments to articles.

I followed along tutorials and mostly done.
But last thing I want to do is that when users make comments to any articles, I want author field and article field to be automatically set.
Currently, users need to choose author field and article field to make comments as well as comment texts.

The tutorial that I followed along uses form_valid and by using form_valid, now I don't need to choose author.
But I have been struggling with how to automatically set article field by using form_valid.

I have a simple models.py and views.py below.

<models.py>

class Article(models.Model):
title = models.CharField(max_length=255)
body = models.TextField()
date = models.DateTimeField(auto_now_add=True)
author = models.ForeignKey(
get_user_model(),
on_delete=models.CASCADE,
)

def __str__(self):
return self.title

def get_absolute_url(self):
return reverse('article_detail', args=[str(self.id)])

class Comment(models.Model): # new
    article = models.ForeignKey(
    Article,
    on_delete=models.CASCADE,
    related_name = 'comments',
    )
    comment = models.CharField(max_length=140)
    author = models.ForeignKey(
        get_user_model(),
        on_delete=models.CASCADE,
    )

    def __str__(self):
        return self.comment

    def get_absolute_url(self):
        return reverse('article_list')

<views.py>
...(not showing all)
#for comment
class ArticleCommentCreateView(LoginRequiredMixin, CreateView):
model = Comment
template_name = 'article_comment_new.html'
fields = ('comment',)
login_url = 'login'

def form_valid(self, form):
form.instance.author = self.request.user
form.instance.article = self.request.article
return super().form_valid(form)

I keep getting errors with this code.
I know that form.instance.article = self.request.article is something wrong, but I am having hard time to figure out how to set article field to be automatically set.


Please give any advice about this.
I really appreciate.

Looking forward to hearing from anyone.

Best regards,

Nori




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