ordering of ManyToManyField in admin shows objects multiple times

[spechtx]

I might came across a possible optimization in the admin:

When there is a model with a ManyToManyField and you set this field in the "ordering" setup in the admin setup, the object will we shown as many times in the admin, as there are relations stored in the m2m field.

In this example, when the "type" field has 5 relations, the object will be shown 5 times in the admin.

models.py:

class RelatedM2M(models.Model):
choice = models.CharField(max_length=255, unique=True)
description = models.TextField(blank=True)

class ModelName(models.Model):
id_uuid = models.UUIDField(...)
timestamp_created = models.DateTimeField(auto_now_add=True)
name = models.CharField(max_length=255)
type = models.ManyToManyField(RelatedM2M, related_name='type')
type_intermediate = models.ManyToManyField(AnotherRelatedM2M, through='RelatedIntermediate')
geometry = models.GeometryField(...)

admin.py:

@admin.register(ModelName)
classModelNameAdminView(admin.GISModelAdmin):
inlines = (RelatedIntermediateInline,)
autocomplete_fields = ['...']
ordering = ['name', 'type', 'timestamp_created', ]

[Mariusz Felisiak]

This is a documented behavior, see ​note in the QuerySet.order_by() docs.