sharix-sports-webservice-running/models/achievement.py

from django.db import models
from webservice_running.models import Sportsman, Achievements

class Achievement(models.Model):
    """
    Achievement (not to confuse with 'Achievements') stores information about achievement history of users.
    Соединяющая таблица пользователя и достижения для истории полученных достижений у конкретного пользователя.
    """
    sportsman = models.ForeignKey(Sportsman, on_delete=models.DO_NOTHING, related_name="sportsman_achievement")
    achievement = models.ForeignKey(Achievements, on_delete=models.DO_NOTHING, related_name="achievement")
    time_received = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "achievement"
        verbose_name = "достижение пользователя"
        verbose_name_plural = "достижения пользователя"
        constraints = [
            models.UniqueConstraint(fields=['sportsman', 'achievement'], name='unique_achievement')
        ]