Testing InlineFormset clean methods
- by Rory
I have a Django project, with 2 models, a Structure and Bracket, the Bracket has a ForeignKey to a Structure (i.e. one-to-many, one Structure has many Brackets). I created a TabularInline for the admin site, so that there would be a table of Brackets on the Structure. I added a custom formset with some a custom clean method to do some extra validation, you can't have a Bracket that conflicts with another Bracket on the same Structure etc.
The admin looks like this:
class BracketInline(admin.TabularInline):
model = Bracket
formset = BracketInlineFormset
class StructureAdmin(admin.ModelAdmin):
inlines = [
BracketInline
]
admin.site.register(Structure, StructureAdmin)
That all works, and the validation works.
However now I want to write some unittest to test my complex formset validation logic.
My first attempt to validate known-good values is:
data = {'form-TOTAL_FORMS': '1', 'form-INITIAL_FORMS': '0', 'form-MAX_NUM_FORMS': '', 'form-0-field1':'good-value', … }
formset = BracketInlineFormset(data)
self.assertTrue(formset.is_valid())
However that doesn't work and raises the exception:
======================================================================
ERROR: testValid (appname.tests.StructureTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/paht/to/project/tests.py", line 494, in testValid
formset = BracketInlineFormset(data)
File "/path/to/django/forms/models.py", line 672, in __init__
self.instance = self.fk.rel.to()
AttributeError: 'BracketInlineFormset' object has no attribute 'fk'
----------------------------------------------------------------------
The Django documentation (for formset validation) implies one can do this.
How come this isn't working? How do I test the custom clean()/validation for my inline formset?
