Rails - many-to-many association

Question

My education app uses single database and has got many users. I have following problem:

When user1 finishes a lesson (lesson model has a column finished with boolean), this lesson is finished ( finished = true ) for all other users.

I would like this lesson was finished for user1 but unfinished for all other users.

In other words, how can I separate changes in database done by user1 from changes done by user2 ?

Thanks in advance.

Answer 1

For this one you may use joining table called for example users_lesson_progresses with has_many :through or has_and_belongs_to_many association.

See the docs here https://guides.rubyonrails.org/association_basics.html

The idea is in users_lesson_progresses table you'll have a separate row for every pair of user and lesson. And after a user finishes a lesson, you create a row for this particular user and this particular lesson and set completed column value to true. Or after a user starts a lesson you set state column in users_lesson_progresses table to started and after he finishes, you set that column value to finished . Same for any other user and any other lesson. That's an examples. Your approach may vary but the main idea is the same.