Re: Problem installing fixtures

Hi Carlos,

Yes, I am. I would be grateful if you could point me in the direction to solve this. I have made quite a few changes to my JSON file before this error occurred. The initial error was:

django.db.utils.IntegrityError: Problem installing fixture '/path/to/Backups/export_16.json': Could not load contenttypes.ContentType(pk=9): duplicate key value violates unique constraint "django_content_type_app_label_76bd3d3b_uniq"
DETAIL: Key (app_label, model)=(equation, formula) already exists..

What I did was delete those content types causing error and iterated the process until it stops occuring. Then, the following error appeared.

django.db.utils.IntegrityError: Problem installing fixtures: insert or update on table "auth_permission" violates foreign key constraint "auth_permiss_content_type_id_2f476e4b_fk_django_content_type_id"
DETAIL:  Key (content_type_id)=(27) is not present in table "django_content_type".

Was the way to solve the first error right or did that lead to the following error?

Thank you so much for your help!

On Friday, February 12, 2016 at 4:11:42 AM UTC, Carlos Leite wrote:

Are you moving the content of your old database to a new one ?

Sorry, if I answer the obvious,

but when you move, it seems that the IDs of your content type has change.

And the DATABASE point you an error "violates foreign key constraint"


auth permission has a generic  relation were a content_type_id = 27


cant be found on content_type table.

let me know if its not enought.

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Cadu Leite

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On Wed, Feb 10, 2016 at 7:07 PM, WST <weishe...@gmail.com> wrote:

Hi All,

I am new to Django and am taking over a project which uses a Django server. Unfortunately, the host machine used in the previous development cycle went missing and I had to set up a new server. I am now having problems loading data onto the database. I have a JSON file from dumpdata on the now missing server. I am facing the error seen below:

Traceback (most recent call last):
  File "/home/wst12/Documents/ipad-app-server/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/loaddata.py", line 60, in handle
    self.loaddata(fixture_labels)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/loaddata.py", line 106, in loaddata
    connection.check_constraints(table_names=table_names)
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/postgresql/base.py", line 223, in check_constraints
    self.cursor().execute('SET CONSTRAINTS ALL IMMEDIATE')
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 95, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py", line 62, in execute
    return self.cursor.execute(sql)
django.db.utils.IntegrityError: Problem installing fixtures: insert or update on table "auth_permission" violates foreign key constraint "auth_permiss_content_type_id_2f476e4b_fk_django_content_type_id"
DETAIL:  Key (content_type_id)=(27) is not present in table "django_content_type".

At first, I was led to believe, after some Googling, that it was cache related. However, clearing content type cache did not solve this problem. I would be grateful if someone could assist me with this. Thank you!

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