Question

我是django的新手，我想制作一个简单的会计应用程序，但是我面临以下问题：我有3个模型；帐户，日记帐和journalLine，我希望每个日记帐编号可以有多行，例如日记帐编号1可以有4行，依此类推。因此，在提交之前，我希望自动创建新的日记帐编号，并将值分配给外键字段（jounralNumber），而不显示列表（列表仅显示在数据库上创建的日记帐编号）

models.py

from django.db import models
from django import forms

# Create your models here.
# Model For chart of accounts table
class accounts(models.Model):
accNumber = models.AutoField(primary_key=True,unique=True)
accName  = models.CharField(max_length=200,unique=True)
accNumberMin = models.PositiveIntegerField(default=0,unique=True)
accNumberMax = models.PositiveIntegerField(default=0,unique=True)
#-- to definde values for choices main or sub-account-start
main = 'main'
sub = 'sub'
main_sub_choices = ((main, 'Main account'),(sub, 'Sub account'))
#-- to definde values for choices for main or sub-account-end
main_sub = 
models.CharField(max_length=10,choices=main_sub_choices,default='sub')

def __str__(self): ## to show accounts as names not objects in Admen panel
    return self.accName



class journal(models.Model):
journalNumber = models.PositiveIntegerField(default='',unique=True)
journalDate = models.DateField()
journalDesc = models.CharField(max_length=300)

def __str__(self):
    return str(self.journalNumber)



class journalLine(models.Model):
LineNumber = models.AutoField(primary_key=True)
journalNumber = models.ForeignKey(journal,on_delete=models.CASCADE)
accNumber = 
models.ForeignKey('accounts',on_delete=models.CASCADE,blank=False)
debit = models.PositiveIntegerField(default=0)
credit = models.PositiveIntegerField(default=0)

def __str__(self):
    return str(self.LineNumber)

views.py

def postpage(request):
initial = {'journalNumber': journal.objects.all().count() + 1,}
lineformset = modelformset_factory(journalLine,exclude=(),extra=1)
if request.method == 'POST':
    form = journalForm(request.POST)
    lineform = lineformset(request.POST)
    if lineform.is_valid():
        lineform.save()
        form.save()
        return HttpResponseRedirect('/myacc/thanks/')
else:
    form = journalForm(initial=initial)
    lineform = lineformset(queryset=journalLine.objects.all().none())

return render(request,'myacc/post.html',{'form':form, 'lineform':lineform})

Answer 1

我的建议是先保存日记帐，然后再保存带有设置为该日记帐的journal_number的日记帐行。您所看到的将是这样，

def postpage(request):
    initial = {'journalNumber': journal.objects.all().count() + 1,}
    lineformset = modelformset_factory(journalLine,exclude=(),extra=1)
    if request.method == 'POST':
        form = journalForm(request.POST)
        if form.is_valid():
            journal = form.save()
            lineform = lineformset(request.POST)
            if lineform.is_valid():
                lineform.save(commit=False)
                lineform.journal_number = journal # or journal.pk
                lineform.save()
                return HttpResponseRedirect('/myacc/thanks/')
    else:
        form = journalForm(initial=initial)
        lineform = lineformset(queryset=journalLine.objects.all().none())

    return render(request,'myacc/post.html',{'form':form, 'lineform':lineform})

希望这会有所帮助！

编辑：这样，您必须将journal_number字段排除在外。如果要保留日记帐编号字段，则需要将表单分为两个步骤，一个步骤创建日记帐，另一个步骤创建journal_line。

Django，保存前创建外键（放置列表）的新值

1 个答案: