Rails: syntax error, unexpected tIDENTIFIER, expecting keyword_end

Ruby on Rails beginner here.

Had this error in localhost:3000

ActiveRecord::PendingMigrationError Migrations are pending. To resolve this issue, run: bin/rake db:migrate RAILS_ENV=development

I ran rake db:migrate in terminal and got this:

$ rake db:migrate
rake aborted!
SyntaxError: /Users/EuphoriaComplex/src/bookmarks/db/migrate/20150407050503_add_user_to_bookmark.rb:5: syntax error, unexpected tIDENTIFIER, expecting keyword_end

    add has_many :bookmarks to app/models/user.rb
                              ^
/Users/EuphoriaComplex/src/bookmarks/db/migrate/20150407050503_add_user_to_bookmark.rb:7: syntax error, unexpected tIDENTIFIER, expecting keyword_end

    add belongs_to :user to app/model/user.rb
                           ^

And this is my code in bookmarks/db/migrate in Sublime:

class AddUserToBookmark < ActiveRecord::Migration
  def change
    add_column :bookmarks, :user_id, :integer

    add has_many :bookmarks to app/models/user.rb

    add belongs_to :user to app/model/user.rb
  end
end

I was following this tutorial: http://ift.tt/11NgAqQ and I only made it to "Require authentication to manage your bookmarks"

"Users have many Bookmarks" is the section in question.