Creating association in rails active record

Question

I am new to Active Record. Actually I want to create two models Student and Course where a student have many courses but a course belongs to only one student. I have created model and associated migration as follows:

rails g Student roll_num:string name:string
rails g Course code:string name:string

Model for student should be ideally like that:

class Student < ActiveRecord::Base
   has_many :course
end

and that of course should be ideally like that:

class Course < ActiveRecord::Base
   belong_to: student
end

My question is such model can be generated with rails g and if so, how? And after creating the model if I specify association then what I have to do so that it gets reflected in the db, I mean foreign key gets created in courses table. Will I have to write separate migration for that?

Absurdim · Accepted Answer · 2014-02-11 03:46:26Z

1

rails g model Student roll_num:string name:string

rails g model Course code:string name:string student:references:index

Also, student has_many :courses

Additional resources: http://edgeguides.rubyonrails.org/migrations.html

answered Feb 11, 2014 at 3:46

Absurdim

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sunil · Accepted Answer · 2014-02-11 14:54:03Z

0

First change your association in student model

has_many :course

You migration file should include foreign keys

class CreateCourses < ActiveRecord::Migration
  def change
    create_table :courses do |t|
      # your columns
      t.references :student

      t.timestamps
    end
  end
end

same See http://sunilsharma3639.wordpress.com/2014/01/10/things-which-rails-could-do-but-i-didnt-know/

Hope it will help you

answered Feb 11, 2014 at 14:54

sunil

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