Class ExperimentMetric

api/experimentation/models.py:255–278

class ExperimentMetric(models.Model):
    experiment = models.ForeignKey(
        Experiment,
        on_delete=models.CASCADE,
        related_name="experiment_metrics",
    )
    metric = models.ForeignKey(
        Metric,
        on_delete=models.CASCADE,
        related_name="experiment_metrics",
    )
    expected_direction = models.CharField(
        max_length=20,
        choices=ExpectedDirection.choices,
    )
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["experiment", "metric"],
                name="metric_attached_once_per_experiment",
            ),
        ]