Cannot save() model with ForeignKey with sqlite, but works OK with PostgreSQL

[Philippe Ombredanne]

Using Django 1.10.1 on Python 2.7.6 on Ubuntu 14.04, I have these simple models:

class A(models.Model):
    text = models.TextField(null=True)

class A2(models.Model):
    a = models.ForeignKey(A)

with PostgreSQL 9.5.4 and psycopg2 things work as expected:

>>> a=A()
>>> a2=A2(a=a)
>>> a.save()
>>> a2.save()
>>> A2.objects.all()[0]
<A2: A2 object>
>>> A2.objects.all()[0].id
1

and I have these queries:

>>> from pprint import pprint as p
>>> from django import db
>>> p(db.connections.all()[0].queries)
.......
    
 {u'sql': u'INSERT INTO "packagedcode_a" ("text") VALUES (NULL) RETURNING "packagedcode_a"."id"',
  u'time': u'0.001'},
 {u'sql': u'INSERT INTO "packagedcode_a2" ("a_id") VALUES (NULL) RETURNING "packagedcode_a2"."id"',
  u'time': u'0.000'}]

If I switch to sqlite3 or (pysqlite):

>>> a=A()
>>> a2=A2(a=a)
>>> a.save()
>>> a2.save()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/base.py", line 796, in save
    force_update=force_update, update_fields=update_fields)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/base.py", line 824, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/base.py", line 908, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/base.py", line 947, in _do_insert
    using=using, raw=raw)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/query.py", line 1045, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1054, in execute_sql
    cursor.execute(sql, params)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/home/pombreda/tmp/local/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py", line 337, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: packagedcode_a2.a_id

and I have these queries:

>>> from pprint import pprint as p
>>> from django import db
>>> p(db.connections.all()[0].queries)
.......
 {u'sql': u'BEGIN', u'time': u'0.000'},
 {u'sql': u'INSERT INTO "packagedcode_a" ("text") VALUES (NULL)',
  u'time': u'0.000'},
 {u'sql': u'BEGIN', u'time': u'0.000'},
 {u'sql': u'INSERT INTO "packagedcode_a2" ("a_id") VALUES (NULL)',
  u'time': u'0.000'}]

[Philippe Ombredanne]

My bad the problem also exists with postgres.