我想要一个字段和一个小部件，让我们有一个“近似”日期，这个想法是只有以下之一：
- 准确日期
- 一年，也许一个月
- 初始年和结束年
一些压缩的有效值可能是：
- “1988/08/07,,,,”
- ",1988,,,"
- ",1988,08,,"
- ",,,1997,1999"
问题是我无法验证字段是否只有上述三个选项之一，在字段定义中我尝试创建验证和清理方法，但它没有得到验证，我怀疑字段之间的链接和小部件是不正确的。我错过了什么？
为此，我创建了一个小部件：
class ApproximatedDateWidget(forms.MultiWidget):
def __init__(self, attrs=None,choices=()):
self.widgets = (
forms.DateInput(attrs=attrs),
forms.TextInput(attrs=attrs),
forms.Select(attrs=attrs,choices=choices),
forms.TextInput(attrs=attrs),
forms.TextInput(attrs=attrs),
)
super(ApproximatedDateWidget, self).__init__(self.widgets, attrs=attrs)
def decompress(self,value):
try :
print value
if value:
l=value.split(",")
print l
if l[0] and l[0]!="":
d=l[0].split("/")
print d
return [date(int(d[0]),int(d[1]),int(d[2])),None,None,None,None]
else:
return [None, l[1], l[2], l[3], l[4]]
return [None, None, None, None, None]
except:
raise
return [None, None, None, None, None]
def format_output(self,rendered_widgets):
return mark_safe(u"""<table>
<tr><td>Exact date:</td><td colspan="3">{0}</td></tr>
<tr><td>Year and month:</td><td>{1}</td><td colspan="2">{2}</td></tr>
<tr><td></td><td>Year</td><td colspan="2">Month</td></tr>
<tr><td>Between:</td><td>{3}</td><td>and</td><td>{4}</td></tr>
<tr><td></td><td>Year</td><td></td><td>Year<td></tr>
</table>
""".format(*rendered_widgets))
和表单字段：
from tools import MonthChoices
from validators import nullableinteger
class ApproximatedDateField(forms.MultiValueField):
"""
Field that allows having an approximated date, one of
exact date, month and year or range of years
"""
def __init__(self, required=False, widget=None, label=None, initial=None,
help_text=None,attrs={}, *args, **kwargs):
self.widget = ApproximatedDateWidget(attrs=attrs,choices=MonthChoices)
widgets=self.widget.widgets
fields = (
forms.DateField(required=required,validators=[lessthantomorrow],widget=widgets[0]),
forms.CharField(widget=widgets[1],required=required,max_length=4,validators=[nullableinteger]),
forms.ChoiceField(required=required,choices=MonthChoices,widget=widgets[2]),
forms.CharField(widget=widgets[3],required=required,max_length=4,validators=[nullableinteger]),
forms.CharField(widget=widgets[4],required=required,max_length=4,validators=[nullableinteger]),
)
super(ApproximatedDateField, self).__init__(fields=fields,required=required, widget=widget,
label=label, initial=initial, help_text=help_text)
def compress(self,data_list):
return """{0},{1},{2},{3},{4}""".format(data_list[0].strftime("%d/%m/%Y"),data_list[1],(data_list[2] and data_list[2].id) or "",data_list[3],data_list[4])
def validate(self,values):
super(ApproximatedDateField, self).validate(values)
if values[0] is not None and (values[1] is not None or values[2] is not None) and (values[1] is not None or values[2] is not None):
raise ValidationError(u'Please only fill exact date or year and month or the range years')
def clean(self,values):
super(ApproximatedDateField, self).clean(values)
if values[0] is not None and (values[1] is not None or values[2] is not None) and (values[1] is not None or values[2] is not None):
raise ValidationError(u'Please only fill exact date or year and month or the range years')