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Editorial Team
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Asked: 2026-06-02T18:41:35+00:00

So I have two models: User and ScheduledSession The users have roles. One of

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So I have two models: User and ScheduledSession

The users have roles. One of the roles is “instructor”.

ScheduledSession
belongs_to :instructor, :class_name => 'User', :foreign_key => 'instructor_id'

User
has_many :scheduled_sessions

GOOD! So I can do this…

s = ScheduledSession.first
s.instructor

BAD! But I can’t do this…

u = User.first
u.scheduled_sessions

I get this error…

SQLite3::SQLException: no such column: scheduled_sessions.user_id: SELECT "scheduled_sessions".* FROM "scheduled_sessions"  WHERE "scheduled_sessions"."user_id" = 1
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: scheduled_sessions.user_id: SELECT "scheduled_sessions".* FROM "scheduled_sessions"  WHERE "scheduled_sessions"."user_id" = 1

How can I setup the relationship the other way around so I can see which scheduled sessions belongs to that instructor (user)?

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1 Answer

  1. Editorial Team

    You just need to set the foreign key in the User has_many relationship as well.

    has_many :scheduled_sessions, :foreign_key => 'instructor_id'
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