Django how the link ManytoManyField data with FloatField data? - django

Question

I have manytomanyfield inside my model.The manytomanyfield field lists the products in the products table.
I want to enter the amount for each product I choose. How can I relate manytomanyfield to floatfield field?
That's my model:
`
class TaskSources(models.Model):
id = models.AutoField(primary_key=True)
user_task_id = models.ForeignKey(UserTask,on_delete=models.CASCADE)
product_id = models.ManyToManyField(Product, verbose_name="Product",default=None)
product_amount = models.FloatField(max_length=255,verbose_name="Product Amount")
`
The form:
`
class TaskSourcesForm(forms.ModelForm):
class Meta:
model = TaskSources
fields = ['product_id', 'product_amount']
`
The views:
`
#login_required(login_url="login")
def addUserTask(request):
user_task_form = UserTaskForm(request.POST or None,initial={'user_id': request.user})
task_sources_form = TaskSourcesForm(request.POST or None)
if request.method == 'POST':
if user_task_form.is_valid():
user_task = user_task_form.save(commit=False)
user_task.author = request.user
user_task.save()
print(user_task.id)
if task_sources_form.is_valid():
task_sources = task_sources_form.save(commit=False)
task_sources.user_task_id = UserTask(id = user_task.id)
task_sources.save()
task_sources_form.save_m2m()
messages.success(request,"Task added successfully!")
return redirect(".")
context = {
"user_task_form" : user_task_form,
"task_sources_form" : task_sources_form,
}
return render(request,"user/addtask.html",context)
`
Thanks for care.
I tried associating the two fields with each other, but I could not succeed.

Answer 1

If I got it right I think that what you need is an intermediate table between your models. That way you can link an amount of a product to a TaskSource, something similar to this:
class Product(models.Model):
name = models.CharField(max_length=128)
def __str__(self):
return self.name
class ProductAmount(models.Model):
amount = models.FloatField(max_length=255,verbose_name="Product Amount")
product = models.ManyToManyField(Product, through='TaskSources')
def __str__(self):
return self.name
class UserTask(models.Model):
name = models.CharField(max_length=128)
def __str__(self):
return self.name
class TaskSources(models.Model):
id = models.AutoField(primary_key=True) # this is not really necessary
task = models.ForeignKey(UserTask,on_delete=models.CASCADE)
product_amount = models.ForeignKey(ProductAmount, on_delete=models.CASCADE)