19 lines
797 B
Python
19 lines
797 B
Python
from django.core.exceptions import ValidationError
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from django.db.models.signals import m2m_changed
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from django.dispatch import receiver
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from .models import LearningMentor
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@receiver(m2m_changed, sender=LearningMentor.participants.through)
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def validate_student(sender, instance, action, reverse, model, pk_set, **kwargs):
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if action == "pre_add":
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participants = model.objects.filter(pk__in=pk_set)
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for participant in participants:
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if participant.course_session != instance.course_session:
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raise ValidationError(
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"Participant (CourseSessionUser) does not match the course for this mentor."
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)
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if participant.user == instance.mentor:
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raise ValidationError("You cannot mentor yourself.")
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