Add URL parameter to forms.ModelForm object and pass to html template

Models.py:

class Training_details(models.Model):
    training = models.ForeignKey(Training, on_delete=models.CASCADE)
    description = models.TextField()
    class Meta:
        db_table = 'training_details'

Views.py:

from .models import Training_details


class TrainingDetailsForm(forms.ModelForm):
    class Meta:
        model = Training_details
        fields = ['description']

def add_training_htm(request):
    if 'training_id' in request.GET and request.GET.get('training_id').isdigit():
        form = TrainingDetailsForm()
        return render(request, 'add_training.html', {'form': form})

How to add URL parameter training_id to TrainingDetailsForm() form and pass that to html template? It should be added to fields list right? but can't figure out correct syntax. Any help please?

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