我有以下型号:
class Product(models.Model):
active = models.BooleanField(default=True)
name = models.CharField(max_length=40, unique=True)
acronym = models.CharField(max_length=3, unique=True)
bool1_name = models.CharField(max_length=60, blank=True, null=True)
bool1_default = models.BooleanField(default=False)
int1_name = models.CharField(max_length=60, blank=True, null=True)
int1_default = models.IntegerField(blank=True, null=True)
float1_name = models.CharField(max_length=60, blank=True, null=True)
float1_default = models.FloatField(blank=True, null=True)
date1_name = models.CharField(max_length=60, blank=True, null=True)
class ProductData(models.Model):
created = models.DateTimeField(default=datetime.now)
created_by = models.ForeignKey(User)
item = models.ManyToManyField(Item)
bool1_val = models.BooleanField(default=False)
int1_val = models.IntegerField(blank=True, null=True)
float1_val = models.FloatField(blank=True, null=True)
date1_val = models.DateField(blank=True, null=True)
class Item(models.Model):
product = models.ForeignKey(Product)
business = models.ForeignKey(Business)
我把以下数据输入数据库:
# pseudo code
Product(1,'Toothpaste','TP','Is the toothpaste white?',1,,,'Weight',1,)
Product(1,'Milk','MLK',,,,,'Litres',2,'Best Before')
我希望能够基于
ProductData
中定义的变量(create-a-form-based-on-the-values-from-another-table)为Product
构建一个表单。我想要这样的东西:class ProductDataForm(ModelForm):
def __init__(self,p,*args,**kwargs):
super(ProductDataForm, self).__init__(*args, **kwargs)
# if the values isn't set in the product
if p.bool1_name is None:
# hide the input
self.fields['bool1_val'].widget = forms.CharField(required=False)
else:
# else make sure the name the field name is the product name
self.fields['bool1_val'].widget = forms.BooleanField(label=p.bool1_name)
...
但我在将
Product
的实例传递到ProductDataForm
时遇到问题。其他人说我可以使用BaseModelFormSet
,但这方面的文献很粗略,我不确定如何应用它。编辑
如果我创建了一个数组,其中包含了我不想在ProductDataForm的in I T中显示的所有字段,那么如何将这些字段传递给Meta类的exclude。就像这样:
class ProductDataForm(ModelForm):
def __init__(self,p,*args,**kwargs):
super(ProductDataForm, self).__init__(*args, **kwargs)
tempExclude = []
if not p.bool1_name:
tempExclude.append('bool1_val')
else:
self.fields['bool1_val'].label = p.bool1_name
self.Meta.exclude = tempExclude
class Meta:
model = ProductData
exclude = []
编辑
我现在试图将要排除的字段存储在
setting.py
文件中,如下所示:# settings.py
SUBITEM_EXCLUDE_FIELDS = ['dave']
# views.py
def new_product_data_view(request,product='0'):
try:
i_fpKEY = int(product)
except ValueError:
raise Http404()
if not i_fpKEY:
t_fp = Product.objects.filter(active=1).order_by('id')[0]
else:
t_fp = Product.objects.get(id=i_fpKEY)
FieldsToExcludeFromProductDataForm(t_fp)
print "views.py > PRODUCTDATA_EXCLUDE_FIELDS = "+str(PRODUCTDATA_EXCLUDE_FIELDS)
siForm = ProductDataForm(t_fp, request.POST, auto_id='si_%s')
return render_to_response(...)
# middleware.py
def FieldsToExcludeFromProductDataForm(tempFP):
excludedFields = ['created','created_by','item']
if not tempFP.bool1_name:
excludedFields.append('bool1_val')
if not tempFP.int1_name:
excludedFields.append('int1_val')
...
for val in excludedFields:
PRODUCTDATA_EXCLUDE_FIELDS.append(val)
print "middleware.py > PRODUCTDATA_EXCLUDE_FIELDS = "+str(PRODUCTDATA_EXCLUDE_FIELDS)
# forms.py
class ProductDataForm(ModelForm):
# Only renames the fields based on whether the product has a name
# for the field. The exclusion list is made in middleware
def __init__(self,fp,*args,**kwargs):
super(ProductDataForm, self).__init__(*args, **kwargs)
if fp.bool1_name:
self.fields['bool1_val'].label = fp.bool1_name
if fp.int1_name:
self.fields['int1_val'].label = fp.int1_name
class Meta:
def __init__(self,*args,**kwargs):
super(Meta, self).__init__(*args, **kwargs)
print 'Meta > __init__ > PRODUCTDATA_EXCLUDE_FIELDS = '+str(PRODUCTDATA_EXCLUDE_FIELDS)
model = ProductData
print 'Meta > PRODUCTDATA_EXCLUDE_FIELDS = '+str(PRODUCTDATA_EXCLUDE_FIELDS)
#exclude = PRODUCTDATA_EXCLUDE_FIELDS
但是终端显示
Meta
类很早就被处理了,因此不能得到新修改的PRODUCTDATA_EXCLUDE_FIELDS
:Meta > PRODUCTDATA_EXCLUDE_FIELDS = ['dave']
[11/Jul/2011 15:51:31] "GET /page/profile/1/ HTTP/1.1" 200 11410
middleware.py > PRODUCTDATA_EXCLUDE_FIELDS = ['dave', 'created', 'created_by', 'item', 'bool1_val', 'int1_val']
views.py > PRODUCTDATA_EXCLUDE_FIELDS = ['dave', 'created', 'created_by', 'item', 'bool1_val', 'int1_val']
[11/Jul/2011 15:51:32] "GET /item/new/ HTTP/1.1" 200 5028
[11/Jul/2011 15:51:32] "GET /client/1/ HTTP/1.1" 200 5445
[11/Jul/2011 15:51:32] "GET /client/view/1/ HTTP/1.1" 200 3082
最佳答案
为什么要使用exclude和元类-只需删除要排除的字段:
class ProductDataForm(ModelForm):
__init__():
...
for field_name in PRODUCTDATA_EXCLUDE_FIELDS:
del self.fields[field_name]
...
也许这不太对,但很简单,而且有效。
关于python - 显示基于另一个表数据的表单元素,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/6608185/