I\'d like the user to be able to make multiple selections via the admin interface, and store the result as a list of comma-separated values. A select-multiple or a list of check
Django-multiselectfield does what you require:
https://github.com/goinnn/django-multiselectfield
It's inspired by the snippet that Alexander mentioned.
This django snippet accomplishes the same with a much smaller footprint.
http://djangosnippets.org/snippets/23/
make sure to update those imports since they are pre version 1.0
There is a django snippet which does just this: multiple choice model field. It says:
Usually you want to store multiple choices as a manytomany link to another table. Sometimes however it is useful to store them in the model itself. This field implements a model field and an accompanying formfield to store multiple choices as a comma-separated list of values, using the normal CHOICES attribute.