models: add a WeekRankField model field to store a choice of weekrank between 0 and 5
This field maps list of small integers to their encoding as a binarynumber. It allows efficient lookup for "in" filters.
models: add a WeekRankField model field to store a choice of weekrank between 0 and 5
This field maps list of small integers to their encoding as a binary
number. It allows efficient lookup for "in" filters.