Notes

Part 07 - Add Genre

01. Generate the Genre model

This generates the model. Unlike rails generate resource ResourceName, this only generates the model, database migration and tests.

$ rails generate model genre
      invoke  active_record
      create    db/migrate/20130322105853_create_genres.rb
      create    app/models/genre.rb
      invoke    test_unit
      create      test/unit/genre_test.rb
      invoke      factory_girl
      create        test/factories/genres.rb

02. Run the CreateGenre database migration

After creating the database migration in ``, running migration will update the database and schema.rb.

$ rake db:migrate
==  CreateGenres: migrating ===================================================
-- create_table(:genres)
   -> 0.0310s
==  CreateGenres: migrated (0.0310s) ==========================================

03. Seed the database

Seed the databaase to initialize it with some default values.

$ rake db:seed

04. Generate migration for Movie

Generate a migration file. This will be then edited to modify Movie with an additional column to connect to Genre

$ rails generate migration AddGenreToMovie
      invoke  active_record
      create    db/migrate/20130322114045_add_genre_to_movie.rb

05. Run the AddGenreToMovie database migration

Apply the update to movies by running rake db:migreate

$ rake db:migrate
==  AddGenreToMovie: migrating ================================================
-- add_column(:movies, :genre_id, :integer)
   -> 0.0006s
-- add_index(:movies, :genre_id)
   -> 0.0006s
==  AddGenreToMovie: migrated (0.0013s) =======================================

Part 08 - Multi Genre

01. Create the Movie / Genre join table migration

Create a migration that will be used for the join table.

$ rails g migration CreateMovieGenreJoin
      invoke  active_record
      create    db/migrate/20130322124335_create_movie_genre_join.rb

02. Run the join table migration

$ rake db:migrate
==  CreateMovieGenreJoin: migrating ===========================================
-- create_table(:genre_movie, {:id=>false})
   -> 0.0335s
==  CreateMovieGenreJoin: migrated (0.0336s) ==================================

03. Create a migration to drop the genre_id colum from Movies

$ rails g migration DropGenreFromMovies
      invoke  active_record
      create    db/migrate/20130322125010_drop_genre_from_movies.rb

04. Run the migration

$ rake db:migrate
==  DropGenreFromMovies: migrating ============================================
-- remove_column(:movies, :genre_id)
   -> 0.0885s
==  DropGenreFromMovies: migrated (0.2793s) ===================================

Part 09 - Add Director

01. Generate Person model

$ rails g model Person
      invoke  active_record
      create    db/migrate/20130322132531_create_people.rb
      create    app/models/person.rb
      invoke    test_unit
      create      test/unit/person_test.rb
      invoke      factory_girl
      create        test/factories/people.rb

02. Add Director to Model

$ rails g migration AddDirectorToMovie
      invoke  active_record
      create    db/migrate/20130322133252_add_director_to_movie.rb

03. Run Migrations

$ rake db:migrate
==  CreatePeople: migrating ===================================================
-- create_table(:people)
   -> 0.0320s
==  CreatePeople: migrated (0.0321s) ==========================================

==  AddDirectorToMovie: migrating =============================================
-- add_column(:movies, :director_id, :integer)
   -> 0.0006s
==  AddDirectorToMovie: migrated (0.0007s) ====================================

Part 10. Add Roles

01. Generate Role Model

$ rails g model Role
      invoke  active_record
      create    db/migrate/20130322135917_create_roles.rb
      create    app/models/role.rb
      invoke    test_unit
      create      test/unit/role_test.rb
      invoke      factory_girl
      create        test/factories/roles.rb

01. Generate Role Model

$ rails g model Role
      invoke  active_record
      create    db/migrate/20130322135917_create_roles.rb
      create    app/models/role.rb
      invoke    test_unit
      create      test/unit/role_test.rb
      invoke      factory_girl
      create        test/factories/roles.rb

02. Run the join table migration

$ rake db:migrate
==  CreateRoles: migrating ====================================================
-- create_table(:roles)
   -> 0.0335s
==  CreateRoles: migrated (0.0336s) ===========================================

03. Create a migration to drop the genre_id colum from Movies

$ rails g migration DropDirectorFromMovie
      invoke  active_record
      create    db/migrate/20130322140228_drop_director_from_movie.rb

04. Run the migration

$ rake db:migrate
==  DropDirectorFromMovies: migrating ==========================================
-- remove_column(:movies, :director_id)
   -> 0.0885s
==  DropDirectorFromMovies: migrated (0.2793s) =================================