我有一个 Django 应用程序，它允许用户创建变量并为其命名
class Product(models.Model):
name = models.CharField(max_length=40, unique=True)
int1_name = models.CharField(max_length=60, blank=True, null=True)
int1_default = models.IntegerField(blank=True, null=True)
int2_name = models.CharField(max_length=60, blank=True, null=True)
int2_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)
float2_name = models.CharField(max_length=60, blank=True, null=True)
float2_default = models.FloatField(blank=True, null=True)
string1_name = models.CharField(max_length=60, blank=True, null=True)
string1_default = models.CharField(max_length=60, blank=True, null=True)
string2_name = models.CharField(max_length=60, blank=True, null=True)
string2_default = models.CharField(max_length=60, blank=True, null=True)
然后存储起来</p>
class ItemData(models.Model):
created = models.DateTimeField(default=datetime.now)
item = models.ForeignKey(Item, editable=False)
int1_val = models.IntegerField(blank=True, null=True)
int2_val = models.IntegerField(blank=True, null=True)
float1_val = models.DecimalField(blank=True, null=True, max_digits=12, decimal_places=2)
float2_val = models.DecimalField(blank=True, null=True, max_digits=12, decimal_places=2)
string1_val = models.CharField(max_length=60, blank=True, null=True)
string2_val = models.CharField(max_length=60, blank=True, null=True)
当我向用户展示一个表单(他们创建的)来填写时，我会执行以下操作以使用用户在其中提供的变量名称来标记字段
class ItemDataForm(ModelForm):
# Only renames the fields based on whether the product has a name for the field
def __init__(self,product,*args,**kwargs):
super(ItemDataForm, self).__init__(*args, **kwargs)
# delete all the fields that will be automatically filled in when saving
del self.fields['created']
# if the values is set in the product
if product.int1_name:
self.fields['int1_val'].label = product.int1_name
self.fields['int1_val'].value = product.int1_default
else:
del self.fields['int1_val']
if product.int2_name:
self.fields['int2_val'].label = product.int2_name
self.fields['int2_val'].value = product.int2_default
else:
del self.fields['int2_val']
if product.float1_name:
self.fields['float1_val'].label = product.float1_name
self.fields['float1_val'].value = product.float1_default
else:
del self.fields['float1_val']
if product.float2_name:
self.fields['float2_val'].label = product.float2_name
self.fields['float2_val'].value = product.float2_default
else:
del self.fields['float2_val']
if product.string1_name:
self.fields['string1_val'].label = product.string1_name
self.fields['string1_val'].value = product.string1_default
else:
del self.fields['string1_val']
if product.string2_name:
self.fields['string2_val'].label = product.string2_name
self.fields['string2_val'].value = product.string2_default
else:
del self.fields['string2_val']
有什么方法可以让我更像 pythonicaly 那样做一个列表是 settings.py 并循环遍历它:
USER_SETTABLE_VARIABLES = ['int1','int2','float1','float2','string1','string2']
这同样适用于我在保存之前确保输入的数据是唯一的方式:
def is_unique(self,latestSI):
if (self.cleaned_data['int1_val'] == latestSI.int1_val and
self.cleaned_data['int2_val'] == latestSI.int2_val and
self.cleaned_data['float1_val'] == latestSI.float1_val and
self.cleaned_data['float2_val'] == latestSI.float2_val and
self.cleaned_data['string1_val'] == latestSI.string1_val and
self.cleaned_data['string2_val'] == latestSI.string2_val):
return False
else:
return True
我之所以问是因为当我想添加到模型时我不想编辑所有这些功能。
请您参考如下方法:
不要为此使用exec! getattr 非常合适，更安全，也更易读。
class ItemDataForm(ModelForm):
def __init__(self,product,*args,**kwargs):
super(ItemDataForm, self).__init__(*args, **kwargs)
del self.fields['created']
fields = 'int1', 'int2', 'float1', 'float2', 'string1', 'string2'
for field in fields:
val = getattr(product, field + '_name')
fval = field + '_val'
if val:
self.fields[fval].label = val
self.fields[fval].value = getattr(product, field + '_default')
else:
del self.fields[fval]
