模板标签错误:“ str”对象没有属性“ as_widget”

时间:2019-04-27 17:28:00

标签: python django templatetags

我做了一个模板标签,当我在模板中使用它时,出现此错误:

  

'str'对象没有属性'as_widget'

这是我的模板标签的代码:

from django import template
register = template.Library()
@register.filter
def field_type(bound_field):
    return bound_field.field.widget.__class__.__name__


@register.filter
def input_class(bound_field):
    css_class = ''
    if bound_field.form.is_bound:
        if bound_field.errors:
            css_class = 'is-invalid'
        elif field_type(bound_field) != 'PasswordInput':
            css_class = 'is-valid'
    return 'form-control {}'.format(css_class)

我的模板在这里:

{% extends 'board/account.html' %}
{% load widget_tweaks %}
{% load form_tags %}
{% block title %}Sign up{% endblock title %}

{% block content %}
<div class="accountform">
    <form method="POST">
        <h4 class="display-6 text-white p-3">Create your account</h4>
        {% csrf_token %}

        <div class="alert alert-danger p-0" style="border:none;">
            {% for field in form.visible_fields %}
            {% for error in field.errors %}
            <span class="err">{{ error }}</span><br>
            {% endfor %}
            {% endfor %}
        </div>

        <div class="form-group">
            <label for="id_username">Username</label>
            {% render_field form.username|input_class class='form-control' placeholder='John Doe' %}
        </div>

        <div class="form-group">
            <label for="id_email">Email</label>
            {% render_field form.email|input_class class='form-control' placeholder='johndoe@email.com' %}
        </div>

        <div class="row">
            <div class="form-group col-md-6">
                <label for="id_password1">Password</label>
                {% render_field form.password1|input_class class='form-control' placeholder='****' %}
            </div>
            <div class="form-group col-md-6">
                <label for="id_password2">Confirm Password</label>
                {% render_field form.password2|input_class class='form-control' placeholder='****' %}
            </div>
        </div>

        <input type="submit" value="Sign up" class="btn btn-primary btn-block">
        <p class="display-6 bg-signup p-3">Have an account <a href="{% url 'signin' %}">Sign In</a></p>
    </form>
</div>

</div>
{% endblock content %}

我在SO中看到了类似的问题并获得了批准的答案,基本上说该问题的解决方案是在上下文中添加表单,并且已经添加了,这里是视图

def signup_view(request):
    if request.method == 'POST':
        form = UserRegistrationForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect('board:home')
    form = UserRegistrationForm(request.POST)
    return render(request, 'accounts/signup.html', {'form': form})

请帮助我解决此问题。谢谢您的帮助。

2 个答案:

答案 0 :(得分:1)

似乎没有任何理由使用这两个模板标签。 django-widget-tweaks已经具有add a custom error class with render_field的功能,并且您已经知道何时渲染密码字段,因此可以在需要时添加该类。

(此外,django-widget-tweaks已经提供了field_type filter)。

所以:

{% with WIDGET_ERROR_CLASS='my_error' %}
    <div class="form-group">
        <label for="id_username">Username</label>
        {% render_field form.username class+='form-control' placeholder='John Doe' %}
    </div>

    <div class="form-group">
        <label for="id_email">Email</label>
        {% render_field form.email class+='form-control' placeholder='johndoe@email.com' %}
    </div>

    <div class="row">
        <div class="form-group col-md-6">
            <label for="id_password1">Password</label>
            {% render_field form.password1| class+='form-control' placeholder='****' %}
        </div>

    ...

{% endwith %}

答案 1 :(得分:0)

您做错了方法,您必须在类属性中添加calss而不是将类名呈现为字段。这样做吧。

{% render_field form.username class=form.username|input_class placeholder='John Doe' %}