Monday, November 29, 2021

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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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)

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

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