Column registred subject isn't nessesary

[ppodolsky]

I think we'll calculate the number of registred subjects to the session S by counting number of rows in joint table SubjectsSessions (UsersSessions) where session_id = S.id . Column registred_subjects in the table Sessions duplicates functionality

[jrhorn424]

Where are you seeing registered_subjects? I was pretty liberal in changing the requirements in the model ticket I finished previously. That column doesn't exist in my code.

For this and other join tables, when the join table can have meaning, I highly suggest naming the join table and using has_many ... through: or has_one ... through:.

For example, instead of subjects_experiments, we would setup models like:

#app/models/experiment.rb
class Experiment < ActiveRecord::Base
  has_many :subjects, through: :participation
  ...
end

#app/models/subject.rb
class Subject < ActiveRecord::Base
  belongs_to :experiment, inverse_of: :subjects
  ...
end

Guideline reference

[ppodolsky]

Yeah, my bad. I mispointed another table in the first message, I've corrected it now. And all the talking was about Session, not Experiment, sorry

[ppodolsky]

And about naming, I'm agree with you. But, in this case, I think users_sessions and users_experiments will be more appropriate. Why? Cause table named «participation» or «registration» won't tell us what we are dealing with – experiment or session – and it can be confusable