[英]Django: creating dynamic forms
I have these models and I want to build forms based on the data: 我有这些模型,我想基于数据构建表单:
class Location(models.Model):
name=models.CharField(max_length=255)
location_id=models.CharField(max_length=255)
organization=models.CharField(max_length=255)
def __unicode__(self):
return self.name
class Beverage(models.Model):
name=models.CharField(max_length=255)
location=models.ForeignKey(Location)
fill_to_standard=models.IntegerField(max_length=10)
order_when_below=models.IntegerField(max_length=10)
def __unicode__(self):
return self.name
class Inventory(models.Model):
location=models.ForeignKey(Location)
beverage=models.ForeignKey(Beverage)
units_reported=models.IntegerField(max_length=10)
timestamp=models.DateTimeField(auto_now=True)
Here is what I want to happen, when a user goes to update inventory for a particular location, I want them to get a form that lists out all the possible beverages for that location (the beverages differ per location) and then create an Inventory
form for it that will create a new line in the Inventory
table for each Beverage
for that Location
. 这就是我想要发生的事情,当用户去更新特定地点的库存时,我希望他们获得一个表格,列出该地点的所有可能饮料(饮料因地点而异),然后创建
Inventory
表格对于它,它将在Inventory
表中为该Location
每个Beverage
创建一个新行。 Each one needs a timestamp so we can have a history. 每个人都需要一个时间戳,所以我们可以有一个历史。 I think I get that I need formsets, but I have not had any success figuring out how to implement them for this.
我想我得到了我需要的表格集,但我没有成功找出如何为此实现它们。 So, this is kind of a two-parter:
所以,这是一个两个部分:
Question 1: model design - I would drop the location field from the Inventory model, since it is already in the Beverage model, and is redundant. 问题1:模型设计 - 我会从库存模型中删除位置字段,因为它已经在Beverage模型中,并且是多余的。 Otherwise, they look good to me.
否则,它们对我来说很好看。
Question 2: formsets... 问题2:formsets ...
forms.py forms.py
from django import forms
from my_project.my_app.models import Beverage
class InventoryForm(forms.ModelForm):
units_reported = forms.IntegerField()
class Meta:
model = Beverage
fields = ('name', 'id')
views.py views.py
from django.forms.models import modelformset_factory
from my_project.my_app.models import Beverage, Inventory
def update_inventory(request, location_id):
InventoryFormSet = modelformset_factory(Beverage, form=InventoryForm)
qs = Beverage.objects.filter(location=location_id)
formset = InventoryFormSet(queryset=qs)
if request.method == 'POST':
formset = InventoryFormSet(request.POST)
if formset.is_valid():
for form in formset:
beverage = form.save(commit=False)
units_reported = form.cleaned_data['units_reported']
Inventory(beverage=beverage, units_reported=units_reported).save()
...
modelformset_factory will create a form for every object (Beverage) in the queryset which is filtered by the desired location, and has an extra field in the customized ModelForm to report units. modelformset_factory将为查询集中的每个对象(Beverage)创建一个表单,该表单由所需位置过滤,并在自定义ModelForm中有一个额外字段来报告单位。
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