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Tag belongs-to - This is page 37 - GeneraCodice
Ruby on Rails prevent nil error when it is assumed record may not exist
https://www.generacodice.com/en/articolo/247581/ruby-on-rails-prevent-nil-error-when-it-is-assumed-record-may-not-exist
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StackOverflow
Rails: belongs_to vs has_one
https://www.generacodice.com/en/articolo/207092/rails-belongs-to-vs-has-one
ruby-on-rails
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model
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belongs-to
StackOverflow
Using ActiveRecord belongs_to with two keys
https://www.generacodice.com/en/articolo/63562/using-activerecord-belongs-to-with-two-keys
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belongs-to
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