"Error: No module named haystack" after installing django haystack inside virtualenv

Question

I am having trouble getting django-haystack installed on my production server.

I get the error No module named haystack when I run any of the following commands:
python manage.py syncdb
python manage.py runserver
python manage.py shell

This is a clone of an existing project running on a development server, so I believe my settings.py is configured correctly.

I am working inside a virtualenv. I have tried uninstalling and reinstalling django-haystack several times using pip.

What could be causing this error?

UPDATE:

Got some more data from following these steps:

Inside virtualenv: pip freeze - django-haystack is not listed.
Outside virtualenv: pip freeze - django-haystack is listed.
Outside virtualenv: sudo pip uninstall django-haystack
Outside virtualenv: pip freeze - django-haystack is not listed.
Inside virtualenv: which pip - /home/{user}/.virtualenvs/{virtualenv}/bin/pip
Inside virtualenv: sudo pip install django-haystack Inside virtualenv: pip freeze - django-haystack is still not listed. Outside virtualenv: pip freeze - django-haystack is listed.

Curious isn't it?
I am using virtualenvwrapper (if you couldn't tell from the pip path)

Why is pip installing it (and some other packages I noticed) outside my virtualenv?

Answer 1

Found answer here: Python packages not installing in virtualenv using pip

The problem was that I was using sudo with pip in my virtualenv. As a result, pip was installing outside of my virtualenv.

Answer 2

pip uninstall haystack

pip install django-haystack