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July 8, 2021 23:31
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association1.rb
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| # it would be nice if we could do this: | |
| inception = Movie.where(:title => 'Inception') | |
| alice,bob = Moviegoer.find(alice_id, bob_id) | |
| # alice likes Inception, bob less so | |
| alice_review = Review.new(:potatoes => 4) | |
| bob_review = Review.new(:potatoes => 3) | |
| # a movie has many reviews: | |
| inception.reviews = [alice_review, bob_review] | |
| # a moviegoer has many reviews: | |
| alice.reviews << alice_review | |
| bob.reviews << bob_review | |
| # can we find out who wrote each review? | |
| inception.reviews.map { |r| r.moviegoer.name } # => ['alice','bob'] |
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The second line returns an ActiveRecord Relation instead of a Movie instance, so the correct code would be:
inception = Movie.where(:title => 'Inception').first OR
inception = Movie.find_by(:title => 'Inception')