activerecord1.rb

activerecord1.rb

####  Create
starwars = Movie.create!(:title => 'Star Wars',
  :release_date => '25/4/1977', :rating => 'PG')
# note that numerical dates follow European format: dd/mm/yyyy
requiem =  Movie.create!(:title => 'Requiem for a Dream',
  :release_date => 'Oct 27, 2000', :rating => 'R')
#  Creation using separate 'save' method, used when updating existing records
field = Movie.new(:title => 'Field of Dreams',
  :release_date => '21-Apr-89', :rating => 'PG')
field.save!
field.title = 'New Field of Dreams'
####  Read
pg_movies = Movie.where("rating = 'PG'")
ancient_movies = Movie.where('release_date < :cutoff and rating = :rating',
  :cutoff => 'Jan 1, 2000', :rating => 'PG')
####  Another way to read
Movie.find(3)  # exception if key not found
####  Update
starwars.update_attributes(:description => 'The best space western EVER',
  :release_date => '25/5/1977')
requiem.rating = 'NC-17'
requiem.save!
####  Delete
requiem.destroy
Movie.where('title = "Requiem for a Dream"')
####  Find returns an enumerable
Movie.where('rating = "PG"').each do |mov|
  mov.destroy
end