Di Rails 4.x bisa dengan References

rails g migration AddLinkRefToArticles link:references

File migrasi yang terjadi

class AddLinkRefToArticles < ActiveRecord::Migration
  def change
    add_reference :articles, :link, index: true
    add_foreign_key :articles, :links
  end
end

Jika benar, di schema.rb bertambah field dan index

t.integer  "link_id"
add_index "articles", ["link_id"], name: "index_articles_on_link_id"

Jangan lupa nambah relasi di model.

MISC Links

https://stackoverflow.com/questions/16257116/adding-foreign-key-to-a-rails-model

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