Django IntegrityError-无法解决

Question

My porgram is giving an IntegrityError when there is a valid submission, that is, when (i think) the program enters the form.is_valid() branch. 当存在有效的提交时，即（我认为）程序进入form.is_valid（）分支时，我的porgram给出了IntegrityError。 Does anyone have a clue about what's causing it? 有人知道是什么原因吗？

PS: I changed the code from no form using to form using, and that's when the error started PS：我将代码从无表单使用更改为表单使用，这就是错误开始的时间

I have the following view 我有以下观点

def new_category(request):
if request.method == "POST":
    form = NewCategoryForm(request.POST)
    if form.is_valid():
        cd = form.cleaned_data
        p = Category(name=cd["name"])
        p.save()
        return HttpResponseRedirect(reverse("objects:index"))
    else:
        return render(request,"objects/new_category.html",{"form":form})
else:
    form = NewCategoryForm()
    return render(request,"objects/new_category.html",{"form":form})

and the models 和模型

class Category(models.Model):
    name = models.CharField("nome da categoria",max_length=100)

    def __unicode__(self):
        return self.name

    def sorted_events(self):
        return self.event_set.order_by("start")

class Event(models.Model):
    category = models.ForeignKey(Category)
    start = models.DateTimeField("horario", default=0)

and the form 和形式

class NewCategoryForm(forms.Form):
    name = forms.CharField(max_length=10,
            error_messages=my_errors)

    def clean_name(self):
        if len(self.cleaned_data["name"]) < 3:
            raise forms.ValidationError("Nome demasiado curto!")

and the template 和模板

<!DOCTYPE html>
<html lang="en">

{% load staticfiles %}
<link rel="stylesheet" type="text/css" href="{% static 'objects/style.css' %}" />


<form action="{% url 'objects:new_category' %}" method="post">
{% csrf_token %}
    <div class="field">
    {% for error in form.name.errors %}
        <p> {{ error }} </p>
    {% endfor %}
    {{ form.name }} 
</div>
<button type="submit">Submit!</button>
</form>

</body>
</html>

EDIT 1: I just ran some tests and found a somewhat weird behaviour. 编辑1：我只是进行了一些测试，发现有些奇怪的行为。 I sumbit a valid input, and execute 我汇总有效输入，然后执行

print request.POST
print form.is_valid()
print cd   #this one inside the if form.is_valid()

the output is this 输出是这个

<QueryDict: {u'csrfmiddlewaretoken': [u'ujlYhAFkFd7PuGJMk2aEmvWkDZmg4HlX'], u'name': [u'awdawdd']}>
True
{'name': None}

Why is the value of "name" being "None", if in the request.POST the "awdawdd" string is there? 如果在request.POST中存在“ awdawdd”字符串，为什么“ name”的值是“ None”？

EDIT 2: More information. 编辑2：更多信息。 Strangely enough, when i try to call form.cleaned_data right in the line before "if form.is_valid()" it says: 奇怪的是，当我尝试在“ if form.is_valid（）”之前的行中调用form.cleaned_data时，它说：

AttributeError: 'NewCategoryForm' object has no attribute 'cleaned_data'

Answer 1

A bit of rework: 一点返工：

class NewCategoryForm(forms.ModelForm):

    class Meta:
        model = Category
        fields = ['name',]

    def validate_name(name):
        if len(name) < 3:
            raise forms.ValidationError("Nome demasiado curto!")

And in the View: 并在视图中：

...
if form.is_valid():
    form.save()  # will save to DB
    return ...
else:
...

Or alternatively: 或者：

...
if form.is_valid():
    cat = form.save(commit=False)  # won't save to DB
    cat = do_stuff_with_cat
    cat.save()
    # to save another instance, one possibility is:
    cat.pk = None
    cat.save()
    return ...
else:
...

Django IntegrityError-无法解决

问题描述

1 个解决方案

解决方案1
0 2014-02-17 02:20:08

Django IntegrityError-无法解决

问题描述

1 个解决方案

解决方案1 0 2014-02-17 02:20:08

解决方案1
0 2014-02-17 02:20:08