This does not work yet. I wrote some failing tests, but while
I was doing that, I came to the conclusion that I want to make
the route of the get request different from the route of the post
request.

Move few constants to a seperate file away from models.
This implies minor edits in other apps relying on
these few constants.

The acknowledgement message is no longer hardcoded in
theses/views.py, but resides in the top-level strings module.

This function helps to create form data from models.
See example given.

Removes some 40 lines of boilerplate, since CreateView
handles the creation of a new ThesisLink.

A CreateView class based view should replace the current
request_thesislink function based view, since it saves
many lines of code and is less error prone and more easily readable.

You can now just call ContributorFactory() to get a freshly instantiated
Contributor to be used for testing purposes.

A blank domain throws an error in /theses/.
I've also installed factory_boy (pip install -r requirements.txt
to get it) and set up a ThesisLinkFactory and a unit tests that
tests whether ThesisLink validates for a blank domain field.

Not sure if this is exactly how you're supposed to validate
a model, but it's a start. First unit test of the project, whoohoo!

This is recommended. Also give names like
MASTER_THESIS = 'MA' to avoid magic strings and allow for easy
reference, e.g. thesis.type = ThesisLink.MASTER_THESIS. This sort
of thing helps in maintainability of the codebase, since if we want
to change the abbreviation to 'MASTER' for some reason, we have it
defined in one place, and not in 100 places in the code.

test_forms.py, test_models.py, test_views.py, as per
recommendation of the two scoops book.

I've opted for hanging indentation

foo = long_function_name(
    var_one, var_two,
    var_three, var_four)

instead of aligning with opening delimiter

foo = long_function_name(var_one, var_two,
                         var_three, var_four)

because the former makes more sense to me. See
https://www.python.org/dev/peps/pep-0008/#indentation