题目内容

Suppose we have setup the foreign key movie_id in reviews table. If we then add has_many :reviews to Movie, but forget to put belongs_to :movie in Review, what happens?

A. We can say movie.reviews, but review.movie won't work
B. We will get a database error when trying to save a Review
C. We will have no way of determining which movie a given review is associated with
D. All of the above

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