我在 forms.py 中有一个 QuestionForm ，旨在创建 Question 模型的实例以显示在 questions.html 中。但是，当我提交表单时，我会被重定向回ask_question.html，而不会创建任何新实例。
我可以通过 Django 管理面板创建问题模型的实例，这是当前唯一显示的实例。
我尝试使用前端创建 Question 模型的实例，并且没有出现错误消息。但是，questions.html 模板中没有出现 Question 模型的实例。
QuestionForm中的
forms.py它似乎按预期工作。
class QuestionForm(forms.ModelForm):
subject = forms.CharField(max_length=100, required=True, help_text='Enter a subject line for your question.')
body = forms.CharField(widget=forms.Textarea, max_length=10000, required=True, help_text='Enter the main body of your question.')
teacher_standard = forms.MultipleChoiceField(
required=False,
widget=forms.CheckboxSelectMultiple,
choices=[(1, 'High Expectations'), (2, 'Promoting Progress'), (3, 'Subject Knowledge'), (4, 'Planning'), (5, 'Differentiation'), (6, 'Assessment'), (7, 'Behaviour Management'), (8, 'Professionalism')],
help_text='Select the standard(s) for which you are asking the question.'
)
class Meta:
model = Question
fields = ['subject', 'body', 'teacher_standard']
Question中的
models.py它似乎按预期工作。
class Question(models.Model):
title = models.CharField(max_length=200, unique=True)
slug = models.SlugField(max_length=200, unique=True)
author = models.ForeignKey(User, on_delete=models.CASCADE, related_name="question_posts")
featured_image = CloudinaryField('image', default='placeholder')
excerpt = models.TextField(blank=True)
updated_on = models.DateTimeField(auto_now=True)
content = models.TextField()
created_on = models.DateTimeField(auto_now_add=True)
status = models.IntegerField(choices=STATUS, default=0)
upvotes = models.ManyToManyField(User, related_name='questionpost_upvote', blank=True)
downvotes = models.ManyToManyField(User, related_name='questionpost_downvote', blank=True)
subject = models.CharField(max_length=100, unique=True)
body = models.TextField
standards = models.ManyToManyField(TeachingStandardTag, related_name='questions', blank=True)
answercount = models.IntegerField(default=0)
views = models.IntegerField(default=0)
class Meta:
ordering = ["-created_on"]
def __str__(self):
return self.subject
def number_of_upvotes(self):
return self.upvotes.count()
ask_question.html它似乎按预期工作。
{% extends "base.html" %}
{% load static %}
{% block content %}
<div class="container">
<h2>Ask a Question</h2>
<form method="post" action="">
{% csrf_token %}
<div class="form-group">
<label for="subject">Subject:</label>
<input type="text" class="form-control" id="subject" name="subject" placeholder="Enter subject line">
</div>
<div class="form-group">
<label for="body">Question:</label>
<textarea class="form-control" id="body" name="body" rows="5" placeholder="Enter the main body of your question"></textarea>
</div>
<div class="form-group">
<label for="teacher_standard">Teacher Standard:</label>
{% for value, text in form.teacher_standard.field.choices %}
<div class="form-check">
<input class="form-check-input" type="checkbox" name="teacher_standard" id="teacher_standard_{{value}}" value="{{value}}">
<label class="form-check-label" for="teacher_standard_{{value}}">
{{text}}
</label>
</div>
{% endfor %}
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
{% endblock %}
views.py这将追溯问题。然而，两者似乎都没有改变任何事情，提交表格后，
questions.htmlclass QuestionCreate(generic.CreateView): # this class will create a question
model = Question
template_name = "ask_question.html" # template for the create question pageddd
fields = ["title", "slug", "author"]
def ask_question(request): # this function will ask a question
if request.method == 'POST':
form = QuestionForm(request.POST)
if form.is_valid():
question = form.save(commit=False)
question.author = request.user # assuming you have user authentication
question.save()
return redirect('questions') # or wherever you want to redirect after successful submission
else:
print(form.errors) # Helps debug what's wrong with the form
else:
form = QuestionForm()
return render(request, 'ask_question.html', {'form': form})
def form_valid(self, form):
# This method is called when valid form data has been POSTed. It should return an HttpResponse.
form.instance.author = self.request.user # Assign the author to the user submitting the form
return super().form_valid(form)
[...]
def question(self, request, *args, **kwargs): #renamed from post to postquestion
# Create a form instance and populate it with data from the request
form = QuestionForm(request.POST)
if form.is_valid():
# Handle the form submission and create a new Question instance
new_question = Question.objects.create(
title=form.cleaned_data['subject'],
content=form.cleaned_data['body'],
author=request.user,
slug=form.cleaned_data['subject'],
status=1
)
new_question.save()
return render(request, 'ask_question.html', {'form': form})
QuestionCreate中的
views.py然而，它似乎没有改变任何东西，提交表单后似乎没有创建任何问题实例。
class QuestionCreate(generic.CreateView): # this class will create a question
model = Question
form_class = QuestionForm # Use the custom form class
template_name = "ask_question.html"
def form_valid(self, form):
form.instance.author = self.request.user
# Generate a slug from the subject or use any other field as necessary
form.instance.slug = form.cleaned_data['subject'].replace(' ', '-').lower()
return super(QuestionCreate, self).form_valid(form)
def get_success_url(self):
# Redirect to the 'questions' page after form submission
return reverse_lazy('questions')
简化views.py 中的
ask_question.html{% extends "base.html" %}
{% load static %}
{% block content %}
<div class="container">
<h2>Ask a Question</h2>
<form method="post" action="">
{% csrf_token %}
{{ form.as_p }} <!-- This will render all the fields using the form instance -->
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
{% endblock %}
这会导致在提交表单时出现新的错误消息：
IntegrityError at /ask_question/
duplicate key value violates unique constraint "blog_question_title_key"
DETAIL: Key (title)=() already exists.
没有错误消息。
QuestionFormforms.pytitle这修复了步骤 8 中的错误消息，但不会创建明显的实例。
class QuestionForm(forms.ModelForm):
subject = forms.CharField(max_length=100, required=True, help_text='Enter a subject line for your question.')
body = forms.CharField(widget=forms.Textarea, max_length=10000, required=True, help_text='Enter the main body of your question.')
teacher_standard = forms.MultipleChoiceField(
required=False,
widget=forms.CheckboxSelectMultiple,
choices=[(1, 'High Expectations'), (2, 'Promoting Progress'), (3, 'Subject Knowledge'), (4, 'Planning'), (5, 'Differentiation'), (6, 'Assessment'), (7, 'Behaviour Management'), (8, 'Professionalism')],
help_text='Select the standard(s) for which you are asking the question.'
)
class Meta:
"""
the Meta class is used to specify the model to which the form is associated and the fields from the model you want the form to include.
"""
model = Question # Specifies the model in models.py associated with this form
fields = ['title', 'subject', 'body', 'teacher_standard'] # The fields from the model you want the form to include
下面我发布了解决问题的步骤。
检查后我很快意识到，在第 6 步或第 7 步之间，我能够在后端存储问题。
我仔细检查了 Django Admin，看看后端是否创建了任何测试表单。他们有！然而，它们并没有出现在前端。我希望他们出现在
questions.html test3 (does not appear in questions.html) subject3 Draft Dec. 22, 2023, 12:21 p.m.
testpost1 testpost1 Published Dec. 18, 2023, 6:57 p.m.
经过检查，我可以看到 test3 是草稿，这可能可以解释为什么它没有上传。当我将状态更改为“已发布”时，它确实出现在
questions.htmlform_valid中的
views.py我试图确保在提交表单并创建问题实例时将问题模型的状态字段设置为“已发布”。我需要调整我的表单或视图逻辑以设置正确的状态。
首先，我调整了
form_validviews.pydef form_valid(self, form):
form.instance.author = self.request.user
form.instance.slug = form.cleaned_data['subject'].replace(' ', '-').lower()
form.instance.status = 1 # Set the status to "Published". Assuming '1' corresponds to "Published" in your STATUS choices
return super().form_valid(form)
这成功创建了一个已发布的实例，该实例出现在
questions.html