Issue in rendering of Inline forms on Django Admin site

Good evening,

I am encountering a weird bug when rendering Inline forms on the "Add" view of a ModelAdmin.

Here is a minimum example with Django version 2.2.4

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in models.py:

class MyModel(models.Model):
    text = models.CharField(max_length=100)

class RelatedModel(models.Model):
    parent = models.ForeignKey(MyModel, null=False, on_delete=models.CASCADE)
    number = models.DecimalField(decimal_places=2, max_digits=10, null=False, blank=False)

in admin.py:

class RelatedModelInlineTabular(admin.TabularInline):
    model = RelatedModel
    show_change_link = False
    fields = ("number", )

class TestMyModelCreate(admin.ModelAdmin):
    fields = ['text', ]
    inlines = [RelatedModelInlineTabular]

admin.site.register(MyModel, TestMyModelCreate)

Steps to replicate:

• Login to django admin website
• open the "add" view for MyModel (i.e. navigate to the list of Models and click on the "Add new" button

Expected result:

The form displays an empty text field. Below that, an Inline form is displayed with 3 empty rows for potential related instances of RelatedModel

Actual result:

The Inline form is displayed twice, each instance with its own 3 empty rows, as if I had specified it twice.

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I attach screenshots of the actual page ( Discount is the related Model). Please note that I get the same result with both StackedInline and TabularInline.

Am I making some trivial error here that could explain what's happening? Or is this is a known bug? Thank you in advance to anyone that will help.

Best regards

*  *  *  *  *

Andrea Arighi ~ Software Developer

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