[英]Django App : Perform arithmetic operation on two fields in database and store result in third field in DB while adding data in form
[英]In django,How to read form data, perform operation and then store in database?
这是我的模型:
class Expense(models.Model):
Item= models.CharField(max_length=100)
description= models.CharField(max_length=1000)
Amount=models.DecimalField(max_digits=18, decimal_places=2, default=0)
date = models.DateField(default=date.today())
category = models.ForeignKey(ExpenseCategory) # either expense or income
我想编写一个代码以从HTML表单上的textarea读取值,如下所示:
"Vegitable 10kg 100 Taxi 10kms 200 mobile brothers 200 clothes 2shirts 1500.50"
然后将其拆分为不同的列表,因为(我已经为此编写了代码):
item=[vegitable,Taxi,mobile,clothes]
description = [10kg,10kms,brothes,2shirts]
amount=[100,200,200,1500.50]
现在,我想编写一个代码以将上面的列表(包含04条记录)以及日期和类别存储到上面的model(实际上是数据库)中。 数据库必须如下所示。
Item description Amount date category
____________________________________________________
Vegitable 10kg 100 28/09/2014 expense
Taxi 10kms 200 28/09/2014 expense
mobile brothers 200 28/09/2014 expense
clothes 2shirts 1500.50 28/09/2014 expense
注意:此处日期为今天日期,类别为费用
经过适当的python格式化后,数据如下所示:
item=['vegitable','Taxi','mobile','clothes']
amount=[100,200,200,1500.50]
description = ['10kg','10kms','brothes','2shirts']
要根据您的模型重新排列数据:
import datetime
from decimal import Decimal as D
category = ExpenseCategory.objects.get(name='expense')
rows = map(lambda i,a,d: {'Item':i, 'Amount':D(a), 'description':d}, item, amount, description)
for row in rows:
expense = Expense(**row)
expense.category = category
expense.date = datetime.datetime.now()
expense.save()
更新:
集成取决于您的表单处理:
将数据格式放在Form.clean
:
class ExpensesForm(forms.Form):
def clean(self):
cleaned_data = super(ExpensesForm, self).clean()
# Your code for splitting things up goes here
cleaned_data['expenses'] = map(lambda i,a,d: {'Item':i, 'Amount':D(a), 'description':d}, item, amount, description)
return cleaned_data
在您看来,您可能会做某事。 像这样:
def my_view(request):
...
if form.is_valid()
for row in form.cleaned_data['expenses']:
expense = Expense(**row)
expense.category = category
expense.date = datetime.datetime.now()
expense.save()
...
def save(self, *args, **kwargs):
category = ExpenseCategory.objects.get(description='expense')
# code for split
str=self.description
lis=str.split()
description=lis[0::3]
item=lis[1::3]
amount=lis[2::3]
rows = map(lambda d,a: {'description':d,'amount':D(a)}, description, amount )
for row in rows:
print("I am in start of for")
expense = Expense(**row)
expense.category = category
expense.date = self.date
print("%s %s %s %s" % (self.description, self.amount,self.category,self.date))
print("%s %s %s %s" % (expense.description, expense.amount,expense.category,expense.date))
expense.save()
#super(Blog, self).save(*args, **kwargs) # Call the "real" save() method
super(Expense, expense).save(*args, **kwargs) # Call the "real" save() method
print("I am in end of for")
上面我在models.py中编写的代码
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