Error: ManagementForm data is missing or has been tampered with

[ADR-007]

Hi! Could you please help me with my problem?

Steps to reproduce:

1. Make the first level polymorphic inline
2. Make the second level polymorphic inline (without this everything is OK)
3. Go to "add new item"
4. Create an empty inline item
5. Click "save"
6. See validation error (because it has required fields)
7. Add another empty inline item
8. There no second-level items anymore
9. Click "save"
10. See error: ManagementForm data is missing or has been tampered with

[ADR-007]

It doesn't send form fields like:

firstlevel-0-secondlevel-2-INITIAL_FORMS: 0
firstlevel-0-secondlevel-2-MAX_NUM_FORMS: 1000
firstlevel-0-secondlevel-2-MIN_NUM_FORMS: 0
firstlevel-0-secondlevel-2-TOTAL_FORMS: 0
firstlevel-0-secondlevel-2-__prefix__-somefield: 
...
firstlevel-empty-secondlevel-2-INITIAL_FORMS: 0
firstlevel-empty-secondlevel-2-MAX_NUM_FORMS: 1000
firstlevel-empty-secondlevel-2-MIN_NUM_FORMS: 0
firstlevel-empty-secondlevel-2-TOTAL_FORMS: 0
firstlevel-empty-secondlevel-2-__prefix__-somefield: 

in the second atempt

[ADR-007]

[ADR-007]

I found the solution!

Just change this line:

django-nested-admin/nested_admin/nested.py

Line 295 in 23d1faa

if request.method == 'GET':

to:

if request.method in ['GET', 'POST']:

[ADR-007]

Thanks!