On Wednesday, 12 November 2014 21:42:43 UTC+1, Collin Anderson wrote:
>
> Hello,
>
> That does seem odd. Are you using a custom form or custom template at all?
>
I bumped into this issue too. I made a minimal project that triggers the
issue :
# model.py
from django.db import models
class Author(models.Model):
name = models.CharField(max_length=100)
def __unicode__(self):
return self.name
class Book(models.Model):
title = models.CharField(max_length=100)
authors = models.ManyToManyField(Author)
def __unicode__(self):
return self.title
# admin.py
from django.contrib import admin
from .models import Author, Book
class AuthorshipInline(admin.TabularInline):
model = Book.authors.through
@admin.register(Author)
class AuthorAdmin(admin.ModelAdmin):
inlines = [AuthorshipInline]
save_as = True
@admin.register(Book)
class BookAdmin(admin.ModelAdmin):
inlines = [AuthorshipInline]
save_as = True
How to reproduce the problem using the admin :
- create two authors
- create a book with those two authors
- edit the book
- click the check box in the "Delete?" column for one of the authors
- click "Save as new"
End of stack trace :
File
"/home/synext/lib/python2.7/site-packages/Django-1.7.1-py2.7.egg/django/db/models/deletion.py"
in collect
168. reverse_dependency=reverse_dependency)
File
"/home/synext/lib/python2.7/site-packages/Django-1.7.1-py2.7.egg/django/db/models/deletion.py"
in add
85. if obj not in instances:
File
"/home/synext/lib/python2.7/site-packages/Django-1.7.1-py2.7.egg/django/db/models/base.py"
in __hash__
485. raise TypeError("Model instances without primary key
value are unhashable")
Exception Type: TypeError at /admin/myapp/book/1/
Exception Value: Model instances without primary key value are unhashable
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