Question

你好我试图从两个模型更新多对多字段。我可以从群集模型成功更新具有M2M字段的模型，但我无法从子网模型更新它。

我将在子网的模板表单中获得的是群集列表... buuuut

分配给子网的群集未显示已选中
当我选择群集并更新表单时，它不会将子网添加到群集

现在我想我只能从群集方面更新m2m关系，当我说出来时我会是正确的吗？

models.py

class Cluster(models.Model):
    cluster = models.CharField(max_length=130, unique=True)
    subnet = models.ManyToManyField('Subnet', null=True, blank=True)

class Subnet(models.Model):
    network_address = models.IPAddressField()
    subnet_prefix = models.ForeignKey('SubnetPrefix')

forms.py

class SubnetForm(forms.ModelForm):
    cluster = forms.ModelMultipleChoiceField(widget=forms.CheckboxSelectMultiple, required=True, queryset=Cluster.objects.all())

def __init__(self, *args, **kwargs):
    self.helper = FormHelper()
    self.helper.form_tag = True
    self.helper.layout = Layout(
        Div(
            Div(Field('network_address', css_class="input-sm"), css_class="col-lg-4"),
            Div(Field('subnet_prefix', css_class="input-sm"), css_class="col-lg-2"),
            css_class="row"
        ),
        Div(
            Div(Field('cluster', css_class="nav nav-list"), css_class="col-lg-4"),
            css_class="row"
        ),
        Div(
            Div(
                Submit('submit', 'Submit'),
            ),
            css_class="row",
        ),
    )
    super(SubnetForm, self).__init__(*args, **kwargs)

    class Meta:
        model = Subnet

views.py

class SubnetUpdateView(UpdateView):
    template_name = 'subnet_update.html'
    model = Subnet
    form_class = SubnetForm
    success_url = '#'

    def form_valid(self, form):
        messages.success(self.request, u"Subnet updated successfully.")
        return super(SubnetUpdateView, self).form_valid(form)

subnet_update.html

{% extends 'base.html' %}
{% load crispy_forms_tags %}

{% block content %}
    <h1>Update Subnet</h1>
    <br />
        {% crispy form %}
    <br />
{% endblock %}

群集形式的html输出

<div class="row" >
<div class="col-lg-4" >
<div id="div_id_cluster" class="form-group">
    <label for="id_cluster_0" class="control-label  requiredField">Cluster<span class="asteriskField">*</span></label>
    <div class="controls " class="nav nav-list">
        <label class="checkbox"><input type="checkbox" name="cluster" id="id_cluster_1" value="1"  class="nav nav-list">CLUSTER01</label>
        <label class="checkbox"><input type="checkbox" name="cluster" id="id_cluster_2" value="2" class="nav nav-list">CLUSTER02</label>
        <label class="checkbox"><input type="checkbox" name="cluster" id="id_cluster_3" value="3"  class="nav nav-list">CLUSTER03</label>
    </div>
</div>
</div>
</div>

Answer 1

这似乎与以下内容重复：

Django ModelForm for Many-to-Many fields

第一个答案不会改变模型，并向您展示如何使您的init复杂化并保存方法以使您的模型工作。

第二个答案是通过模型明确定义自己的m2m来简化表单。

如何从两个模型更新多对多？

1 个答案: