Get the list of related objects in Django

I have 3 models:

class Node(models.Model):      ID = models.DecimalField(max_digits=19, decimal_places=10)      name = models.CharField(default='node', max_length=32)      connexion = models.CharField(max_length=255)      # Many2one fields | Foreign keys:      firm = models.ForeignKey('firme.Firme', on_delete=models.CASCADE, null=True, blank=True)      class ScheduledAction(models.Model):      date = models.DateTimeField(default=datetime.now, blank=True)      firm = models.ForeignKey('firme.Firme', on_delete=models.CASCADE, null=True, blank=True)      node_ids = models.ManyToManyField(Node)

I want in ScheduledAction form to show, for a selected firm, the list of its related nodes. Normally I should do this by get:

class ScheduledActionForm(forms.ModelForm):      date = forms.DateTimeField()      firm = forms.ModelChoiceField(queryset=Firme.objects.all())      node_ids = forms.ModelMultipleChoiceField(queryset=Node.objects.get(firm_id=firm.id), widget=forms.CheckboxSelectMultiple)        class Meta:          model = ScheduledAction          fields = [              'date',              'firm',              'node_ids'          ]

But I got this error:

AttributeError: 'ModelChoiceField' object has no attribute 'id'

How can I fix this?

This is my post in StackOverFlow.

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