Sorting an array by category names
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1、a = [ {id: 3, category_name: "Horror"}, {id: 4, category_name: "Non-Fiction"}, {id: 5, category_name: "LGBT"}, {id: 6, category_name: "Romance"}, {id: 7, category_name: "Romance"}]categories_sorted = [ "Romance", "LGBT", "Non-Fiction", "Horror"]p a.sort_by { |h| [categories_sorted.index(h[:category_name]), h[:id]] }2、a.group_by { |h| h[:category_name] }.values_at(*categories_sorted).flatten
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