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これは超便利！指定のカラムをキーとしたHashを簡単に作る方法

Ruby
Rails

Posted at 2015-03-24


user = User.all

{
 [name: 'a', category: 1],
 [name: 'b', category: 2],
 [name: 'c', category: 1]
}

user.group_by(&:category)

{
 1 : [{name: 'a'}, {name: 'c'}], 
 2 : [{name: 'b'}]
}

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