django - pass multiple instance into form and save it in DB - django

Question

I have a view where they are multiple posts and I want when the user like one of them, the form take the user_id and the post_id and save it into the DB. This is th Models.py:
class LikePost(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
post = models.ForeignKey(Posts, on_delete=models.CASCADE)
def __str__(self):
return '{} - {}'.format(self.user.username, self.post.name)
Forms.py:
class LikePostForm(forms.ModelForm):
class Meta:
model = LikedShops
fields = ['user', 'post']
widgets = {
'user': forms.HiddenInput(),
'post': forms.HiddenInput()
}
Views.py:
def posts(request):
if request.method == 'POST':
form = LikePostForm(request.POST)
if form.is_valid():
u = form.save(commit=False)
u.user = request.user
u.save()
return redirect('posts')
else:
form = LikePostForm()
context = {
'posts': Posts.objects.all(),
'form': form
}
return render(request, "posts.html", context)
and this the form in posts.html:
{% for post in posts %}
<div class="col-md-3">
<article class="card mb-4">
<header class="card-header">
<h4 class="card-title"><b>{{ post.name }}</b></h4>
</header>
<img style="width: 100%; height: 150px;" class="card-img" src="{{ post.image.url }}"/>
<div class="card-body">
<p class="card-text">{{ post.description }}</p>
</div>
{% if user.is_authenticated %}
<div class="card-footer">
<div class="row">
<div class="col">
<form action="/posts/" method="post">
{% csrf_token %}
{{ l_form|crispy }}
<button type="submit" class="btn btn-outline-success">Like</button>
</form>
</div>
</div>
</div>
{% endif %}
</article><!-- /.card -->
</div>
{% endfor %}
This is my edit, I did what you said, I made changes to:
forms.py:
class Meta:
model = Liked
fields = ['user', 'post']
widgets = {
'user': forms.HiddenInput(),
'post': forms.HiddenInput()
}
posts.html:
<form action="/posts/" method="post">
{% csrf_token %}
<input type="hidden" name="post" value="{{ post.pk }}">
{{ l_form|crispy }}
<button type="submit" class="btn btn-outline-success">Like</button>
</form>
views.py:
def posts(request):
if request.method == 'POST':
l_form = LikePostForm(request.POST, instance=request.user.profile)
if l_form.is_valid():
u = l_form.save(commit=False)
u.post = Posts.objects.filter(pk=l_form.cleaned_data.get('post')).first()
u.save()
messages.success(request, f"Form is valid!")
else:
messages.warning(request, f'Form is not valid! {request.POST}')
else:
l_form = LikePostForm(instance=request.user.profile)
context = {
'post': Posts.objects.all(),
'l_form': l_form
}
return render(request, "posts.html", context)
Now when I click the Like button, I got this message **Form is not valid! <QueryDict: {'csrfmiddlewaretoken': ['cNk9ZDS33Nj0l95TBfwtedL1jjAbzDSrH15VjMNZAcxjQuihWNZzOkVnIyRzsjwN'], 'post': ['1', ''], 'user': ['1']}>**

Answer 1

There are a couple of issues with your code.
First, the __str__() method should return a string and not a tuple
class LikePost(models.Model):
...
def __str__(self):
return '{} - {}'.format(self.user.username, self.post.name)
Second, there is a typo; change Pots to Posts:
context = {
'posts': Posts.objects.all(),
'form': form,
}
return render(request, "posts.html", context)
And third and last, the line u.post = request.post is throwing the error you mention, because the request object has no attribute post.
So change your form code to add the post in hidden state (I used fields instead of exclude):
class LikePostForm(forms.ModelForm):
class Meta:
model = LikePost
fields = ['post', ]
widgets = {
'post': forms.HiddenInput(),
}
and then change your view:
form = LikePostForm(request.POST)
if form.is_valid():
u = form.save(commit=False)
u.user = request.user
u.save()
After edit to the question:
Try adding post.pk as a hidden input in your form:
<form action="/posts/" method="post">
{% csrf_token %}
<input type="hidden" name="post" value="{{ post.pk }}">
{{ l_form|crispy }}
<button type="submit" class="btn btn-outline-success">Like</button>
</form>
or you can also do in your view:
u.post = Posts.objects.filter(pk=form.cleaned_data.get('post')).first()