Python Django CreateView与form_类不创建模型_Python_Django

Python Django CreateView与form_类不创建模型

python django

Python Django CreateView与form_类不创建模型,python,django,Python,Django,我从两勺Django书中练习，我在CreateView中遇到了form_类的问题。如果我只在CreateView中使用字段，它将保存模型，如果我使用form_类，它也不会保存和重定向我使用form_类来练习验证器 views.py class FlavorCreateView(LoginRequiredMixin, CreateView): model = Flavor success_url = '/flavors/list/' template_name = 'fl

我从两勺Django书中练习，我在CreateView中遇到了form_类的问题。如果我只在CreateView中使用字段，它将保存模型，如果我使用form_类，它也不会保存和重定向

我使用form_类来练习验证器

views.py

class FlavorCreateView(LoginRequiredMixin, CreateView):
    model = Flavor
    success_url = '/flavors/list/'
    template_name = 'flavor_create.html'
    success_msg = 'Flavor created.'
    form_class = FlavorForm
    # fields = ['title', 'slug', 'scoops_remaining']

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super(FlavorCreateView, self).form_valid(form)

forms.py

class FlavorForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(FlavorForm, self).__init__(*args, **kwargs)
        self.fields['title'].validators.append(validate_tasty)
        self.fields['slug'].validators.append(validate_tasty)

    class Meta:
        model = Flavor
        fields = ['title', 'slug', 'scoops_remaining']

验证器.py

def validate_tasty(value):
    """
    Raise a ValidationError if the value doesn't start with the word 'Tasty'.
    """
    if not value.startswith('Tasty'):
        msg = 'Must start with Tasty'
        raise ValidationError(msg)

flavor_create.html

{% extends 'base_flavor.html' %}

{% block content %}

<form action="" method="POST">{% csrf_token %}
    <p style="color: red;">{{ form.title.errors.as_text }}</p>
    {% for field in form  %}
        <p>{{ field.label }}: {{ field }}</p>
    {% endfor %}
    <button type="Submit">Salveaza</button>

</form>

    <a href="{% url 'flavors:list_flavor' %}">Return home</a>
{% endblock %}

{%extends'base\u flavor.html%}
{%block content%}
{%csrf_令牌%}
{{form.title.errors.as_text}
{%形式的字段为%}
{{field.label}}:{{field}
{%endfor%}
萨尔瓦多
{%endblock%}

您的代码可能正按预期工作（看起来是这样的）：

“不保存也不重定向”：=出现验证错误时会发生这种情况

重写

表单\u invalid

，并打印一些日志输出。或者只是在模板中输出表单错误

Django中出现验证错误时会发生的情况是重新加载表单，并将错误添加到模板上下文中，以便为用户呈现这些错误

只是一个旁注：

替代

self.fields['title'].validators.append(validate_tasty)

您只需将

validate\u tasty

方法直接添加到您的

FlavorForm

名称下的

clean\u title

和

clean\u slug

。这是用于添加自定义验证逻辑的Django标准方法

class FlavorForm(forms.ModelForm):

    def clean_title(self):
        # even if this is a required field, it might be missing
        # Django will check for required fields, no need to raise
        # that error here, but check for existence
        title = self.cleaned_data.get('title', None)
        if title and not value.startswith('Tasty'):
            msg = 'Must start with Tasty'
            raise ValidationError(msg):
        return title

    class Meta:
        model = Flavor
        fields = ['title', 'slug', 'scoops_remaining']