The students_subjects have foreign key constraints in the migration file.
I wanted to check if foreign key constraints were working, so I expected ActiveRecord::InvalidForeignKey to raise it as follows:
It turned out differently than I expected.
student.students_subjects.create!(subject_id:'dummy')
# Enter ActiveRecord::RecordInvalid:Subject
By the way, I thought the problem was that it was a string even though it was an id, so it was the same even if I tried an id that didn't actually exist.
student.students_subjects.create! (subject_id:999)
# Enter ActiveRecord::RecordInvalid:Subject
Looking at the rails formula, I think it's strange because it happens during insert.
https://api.rubyonrails.org/v6.1.0/classes/ActiveRecord/InvalidForeignKey.html
I would appreciate it if you could advise me if you know the cause or clue.
ruby-on-rails rails-activerecord
Currently, I think it is as follows.
In this case, the student_id (the id of the student present) is automatically required, so
ActiveRecord::RecordInvalid occurs.
class StudentsSubject
belongs_to —student
end
You can raise the ActiveRecord::InvalidForeignKey because the student_id is no longer required by doing the following:
belongs_to:student, optional:true
© 2024 OneMinuteCode. All rights reserved.