Tips and tricks

Clearing the cache

Sometimes there are changes to the internal changes of the cached structures. It is recommended that you just clear all the existing caches python clear-cache --clear-all or just set the timeout to something like one second (in

'default': {
    'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    'LOCATION': 'wger-cache',
    'TIMEOUT': 1

Miscellaneous settings

The following settings can be very useful during development (add to your

Setting the email backend

Use the console backend, all sent emails will be printed to it:

EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'

Dummy data generator

To properly test the different parts of the application for usability or performance, it is often very useful to have some data to work with. For this reason, there are dummy data generator scripts for the different entry types:


Alternatively, you can just call dummy-generator which will in turn call the other scripts with their default values

For help, just do:

python3 dummy-generator-<name> --help


All generated users have their username as a password.


While it is possible to generate hundreds of users, gyms are more restricted and you will probably get duplicate names if you generate more than a dozen.

Selectively running tests

If you do a python test you will run the complete testsuite, and this can take a while. You can control which tests will be executed like this.

Test only the tests in the ‘core’ app:

python test wger.core

Test only the tests in the ‘` file in the core app:

python test wger.core.tests.test_user

Test only the tests in ‘StatusUserTestCase’ in the file ‘` file in the core app:

python test wger.core.tests.test_user.StatusUserTestCase

Using runserver_plus

During development, you can use runserver_plus instead of the default Django server as you can use an interactive debugger directly from the browser if an exception occurs. It also accepts the same command-line options. For this just install the following packages:

pip install django_extensions werkzeug
python runserver_plus [options]


  • Send pull requests: for new code you want to share, please send pull requests in GitHub. Sending patches by email or attaching them to an issue means a lot more work. It’s recommended that you work on a feature branch when working on something, especially when it’s something bigger. While many people insist on rebasing before sending a pull request, it’s not necessary.

  • Run the tests: wger is proud to have a test coverage of over 90%. When you implement something new, don’t forget to run the testsuite and write appropriate tests for the new code.

  • Code according to the coding style: Coding Style Guide