我有一个django表单，我想验证字段在我要保存时不是空的，让我们说例如＆＃34;描述＆＃34; field（charfield）....这是我的 form.py 代码：
from django.core.exceptions import ValidationError
class CostItemsForm(ModelForm):
groupid = forms.CharField(required=True)
def __init__(self, *args, **kwargs):
super(CostItemsForm, self).__init__(*args, **kwargs)
class Meta:
model = CostItems
fields = [
'description',
'usd_value',
'rer',
'pesos_value',
'supplier',
'position',
'observations',
'validity_date',
]
def clean_description(self):
des = self.cleaned_data['description']
if des==None:
raise ValidationError("Description cannot be empty")
return des
但没有任何反应，已经尝试过这样的回复：return self.cleaned_data和return clean_description但仍然相同。
这是我的 view.py ：
class CostItemInsert(View):
template_name='cost_control_app/home.html'
def post(self, request, *args, **kwargs):
if request.user.has_perm('cost_control_app.add_costitems'):
form_insert = CostItemsForm(request.POST)
if form_insert.is_valid():
form_save = form_insert.save(commit = False)
form_save.save(force_insert = True)
messages.success(request, "Record created")
else:
messages.error(request, "Could not create record, please check your form")
else:
messages.error(request, "Permission denied")
form_group = GroupsForm()
form_subgroup= SubGroupsForm()
form_cost_item = CostItemsForm()
return render(request, self.template_name,{
"form_subgroup":form_subgroup,
"form_cost_item":form_cost_item,
"form_group":form_group,
})
和costitems模型：
class CostItems(ModelAudit):
cost_item = models.AutoField(primary_key = True, verbose_name = 'Item de costo')
group = models.ForeignKey(Groups, verbose_name = 'Grupo')
description = models.CharField(max_length = 100, verbose_name =' Descripcion')
usd_value = models.IntegerField(verbose_name ='Valor en USD')
rer = models.IntegerField(verbose_name = 'TRM negociado')
pesos_value = models.IntegerField(verbose_name = 'Valor en pesos')
supplier = models.ForeignKey(Suppliers, verbose_name = 'Proveedor')
position = models.ForeignKey(Positions, verbose_name = 'Cargo')
observations = models.TextField(max_length = 500, verbose_name = 'Observación')
validity_date = models.DateField(verbose_name = 'Fecha de vigencia')
def __str__(self):
return self.description
class Meta:
ordering = ['cost_item']
verbose_name = 'Item de costos'
verbose_name_plural = 'Items de costo'
这是我从html模板中的输入按钮调用的模态代码，我调用该视图：
<div class="modal fade bs-example-modal-lg" id="myModals" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Registrar item de costo</h4>
</div>
<form method="post" action="{% url 'cost_control_app:cost_item_insert' %}">
{% csrf_token %}
<div class="modal-body">
<br/>
<div class="row">
{%include "partials/field.html" with field=form_cost_item.groupid|attr:"readonly:True" %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.description %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.usd_value|attr:"value:0"|attr:"id:id_usd_value" %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.rer|attr:"value:0"|attr:"id:id_rer_value" %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.pesos_value|attr:"value:0"|attr:"id:id_pesos_value" %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.supplier %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.position %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.observations %}<br clear="all"/>
{%include "partials/field.html" with field=form_cost_item.validity_date %}<br clear="all"/>
</br>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Cerrar</button>
<button type="submit" class="btn btn-primary">Guardar</button>
</div>
</form>
</div>
</div>
</div>
最后，partials / fields.html：
{% load widget_tweaks%}
<div class="col-md-10">
<div class="form-group {% if field.errors %}has-error{% endif %}">
<label class="col-sm-2 control-label">{% if field.field.required %}{% endif %}{{ field.label }}<label style="color:red">*</label></label>
<div class="col-sm-10">
{% if type == 'check' %}
{{ field|add_class:"check" }}
{% elif type == 'radio' %}
{{ field|add_class:"radio" }}
{% else %}
{{ field|add_class:"form-control" }}
{% endif %}
</div>
{% for error in field.errors %}
<div class="error_msg">- {{ error }}</div>
{% endfor %}
</div>
</div>
任何帮助？
提前致谢
答案 0 :(得分：6)
des never将等于None，默认值至少为空字符串
if not des:应足以满足你的if语句
如果你真的要检查的是否是空的，你可以通过将blank设置为False
description = models.CharField(max_length = 100, blank=False, verbose_name =' Descripcion')
如果某个字段为空= True，则表单验证将允许输入空值。如果字段为空= False，则需要该字段。
是的，但是在用户可以继续保存之前，是否存在用于在表单内显示警报的验证错误？
是的，但是在您向用户显示之前覆盖了表单，这可以通过在方法顶部定义表单然后再将其覆盖下来轻松解决
def post(self, request, *args, **kwargs):
form_group = GroupsForm()
form_subgroup= SubGroupsForm()
form_cost_item = CostItemsForm()
if request.user.has_perm('cost_control_app.add_costitems'):
form_cost_item = CostItemsForm(request.POST)
if form_cost_item.is_valid():
form_save = form_cost_item.save(commit = False)
form_save.save(force_insert = True)
messages.success(request, "Record created")
else:
messages.error(request, "Could not create record, please check your form")
else:
messages.error(request, "Permission denied")
return render(request, self.template_name,{
"form_subgroup":form_subgroup,
"form_cost_item":form_cost_item,
"form_group":form_group,
})
答案 1 :(得分：0)
如果您尝试在模板中显示表单错误，则应将错误传递给模板。在您的情况下，视图应该类似于以下内容。
def post(self, request, *args, **kwargs):
if request.user.has_perm('cost_control_app.add_costitems'):
form_insert = CostItemsForm(request.POST)
if form_insert.is_valid():
form_save = form_insert.save(commit = False)
form_save.save(force_insert = True)
messages.success(request, "Record created")
else:
messages.error(request, "Could not create record, please check your form")
form_group = GroupsForm()
form_subgroup= SubGroupsForm()
return render(request, self.template_name,{
"form_subgroup":form_subgroup,
"form_cost_item":form_insert,
"form_group":form_group,
})
else:
messages.error(request, "Permission denied")
form_group = GroupsForm()
form_subgroup= SubGroupsForm()
form_cost_item = CostItemsForm()
return render(request, self.template_name,{
"form_subgroup":form_subgroup,
"form_cost_item":form_cost_item,
"form_group":form_group,
})
我可以看到默认情况下模型中的字段是必填字段。所以无论如何它会引发验证错误。如果表单无效，您需要做的就是将错误表单传递给模板。