11 Mar '12, 12am

“A Guide to Active Record Associations”

is a connection between two Active Record models. Associations are implemented using macro-style calls, so that you can declaratively add features to your models. For example, by declaring that one model belongs_to another, you instruct Rails to maintain Primary Key–Foreign Key information between instances of the two models, and you also get a number of utility methods added to your model. Rails supports six types of associations:

Full article: http://guides.rubyonrails.org/association_basics.html

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