ModelForm和ModelFormSet的用法

ModelForm的用法:

class GoodsModelForm(forms.ModelForm):
    """
    ModelForm
    """
    class Meta:
        model=models.Goods
        fields="__all__"
        # 错误消息
        error_messages={
            'name':{'required':'不能为空'}
        }
        # 插件
        widgets={
            'source':forms.RadioSelect()
        }
    
    # 定义class属性
    def __init__(self,*args,**kwargs):
        super().__init__(*args,**kwargs)
        for name,filed in self.fields.items():
            if name=='source':
                # 根据打印数据额类型找到源码去掉--------------
                from django.forms.models import ModelChoiceField
                filed.empty_label=None
            else:
                filed.widget.attrs['class']='form-control

ModelFormSet的用法:

def mult_add(request):
    """
    批量添加
    :param request:
    :return:
    """
    from  django.forms.models import modelformset_factory
    GoodsModelFormSet=modelformset_factory(model=models.Goods,form=GoodsModelForm,extra=3)
    if request.method=='GET':
        form_set=GoodsModelFormSet()
        return render(request, 'mult_add.html', {'form_set': form_set})
    form_set=GoodsModelFormSet(data=request.POST)
    if form_set.is_valid():
        form_set.save()
        return  redirect('/index/')
    return render(request,'mult_add.html')

添加后端代码：

def add(request):
    """
    添加
    :param request:
    :return:
    """
    if request.method=="GET":
        form=GoodsModelForm()
        return  render(request,'add.html',{'form':form})
    form=GoodsModelForm(data=request.POST)
    print(form)
    if form.is_valid():
        form.save()
        return redirect('/index/')
    return render(request, 'add.html', {'form': form})

添加前端代码：

<link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/css/bootstrap.css">
<div class="container">
    <h1>批量增加商品</h1>
    <form method="post">
        {% csrf_token %}
        {{ form_set.management_form }}
        <table class="table table-bordered table-hover">
            <thead>
            <tr>
                <th>商品名称</th>
                <th>价格</th>
                <th>来源</th>
                <th>分类</th>
                <th>库房</th>
            </tr>
            </thead>
            <tbody>
            {% for form in form_set %}
                <tr>
                    {% for field in form %}
                    <td>{{ field}} {{ field.errors.0}}</td>
                    {% endfor %}
                </tr>
            {% endfor %}
            </tbody>
        </table>
        <input type="submit" value="提交">
    </form>
</div>

修改后端代码：

def update(request,nid):
    """
    修改
    :param request:
    :param nid:
    :return:
    """
    obj=models.Goods.objects.filter(id=nid).first()
    if request.method=="GET":
        form=GoodsModelForm(instance=obj)
        return  render(request,'update.html',{'form':form})
    form=GoodsModelForm(data=request.POST,instance=obj)
    if form.is_valid():
        form.save()
        return redirect('/index/')
    return render(request, 'update.html', {'form': form})

 修改前端代码：

<div class="container">
    <h1>添加商品</h1>
    <form class="form-horizontal" method="post" novalidate>
        {% csrf_token %}
        {% for field in form %}
            <div class="form-group">
                <label class="col-sm-2 control-label">{{ field.label }}</label>
                <div class="col-sm-10">
                    {{ field }} <span style="color: red;">{{ field.errors.0 }}</span>
                </div>
            </div>
        {% endfor %}

        <div class="form-group">
            <div class="col-sm-offset-2 col-sm-10">
                <input type="submit" class="btn btn-success" value="提 交">
            </div>
        </div>
    </form>

</div>