Question

我使用Django遇到了一个问题。我正在创建一个跟踪存款和取款的财务应用程序。不过我使用模型遇到了一个问题。这是相关代码

Views.py

from django.shortcuts import render
from .models import Transaction

# Create your views here.
class Transaction:
    def __init__(self, name, description, location, amount):
        self.name = name
        self.description = description
        self.location = location
        self.amount = amount    

def sum(totals):
    sum = 0
    for i in range(len(totals)):
        if totals[i].name.lower() == 'deposit':
            sum += totals[i].amount
        else:
            sum -= totals[i].amount
    return sum


#transactions = [
#   Transaction('Deposit', 'Allowance', 'Home', 25.00),
#   Transaction('Withdrawl', 'Food', 'Bar Burrito', 11.90),
#   Transaction('Withdrawl', 'Snacks', 'Dollarama', 5.71)
#]



def index(request):
    transactions = Transaction.objects.all()
    balance = sum(transactions)
    return render(request, 'index.html', {'transactions':transactions,  'balance': balance})

Models.py

from django.db import models

# Create your models here.
class Transaction(models.Model):
    name = models.CharField(max_length = 100)
    description = models.CharField(max_length = 100)
    location = models.CharField(max_length = 100)
    amount = models.DecimalField(max_digits = 10, decimal_places = 2)

    def __str__(self):
        return self.name

admin.py

from django.contrib import admin
from .models import Transaction

# Register your models here.
admin.site.register(Transaction)

如果您需要查看并提前感谢，请告诉我

Answer 1

您的视图中不需要第二个Transaction课程。它隐藏了从模型导入的Transaction模型/类。删除它！

更重要的是，您还不需要自定义总和功能，请使用内置 sum ：

def index(request):
    transactions = Transaction.objects.all()
    balance = sum(t.amount if t.name=='deposit' else -t.amount for t in transactions)
    ...

Answer 2

Transaction文件中的views.py课程会影响您的Transaction模型。

Transaction文件中的

views.py是一个简单的python类（不是Django模型），要解决您的问题，需要将其从views.py中删除

views.py中的AttributeError：type object＆＃39; Transaction＆＃39;没有属性＆＃39;对象＆＃39;

2 个答案: