Enable custom config for subscribers

[slaweet]

UI that allows to change:

• [x] set length
• [x] target difficulty
• [x] no-wiriting/open/multiple-choice questions
• [ ] turn off reference questions in no-writing condition
• [ ] change reference questions when set length is changed

[papousek]

Properties are:

1. set length: proso_models.practice.set_length (it is necessary to set also proso_models.random_test.nth to the same number, or -1 to disable reference questions)
2. target_difficulty: item_selector.parameters.target_probability
3. question type:
   • no-open: proso_models.option_selector.parameters.allow_zero_options: false
   • no-writing: proso_models.option_selector.parameters.allow_zero_options_restriction: true

[slaweet]

An initial version implemented: https://staging.anatom.cz/settings/ Known problems:

• [x] Values are saved (checked in [0]) but after reload the form shows the default values again. I don't see why, I use get_global_config() (in views.py [1]) and it doesn't contain the new values.

[0] https://staging.anatom.cz/common/config/ [1] https://github.com/adaptive-learning/anatomy/blob/master/anatomy/views.py#L76

[papousek]

I will investigate it.