Ruby Array sort_by value in variable

Question

I would like to sort Ruby Array by key in variable, but I don't know how.

Situation

my_arr.sort_by {|record| [record.year]}

Will sort by a year of the record. But I want to sort by author, label, etc. And this sort type is stored in a variable like a String. So I need to evaluate the filter like

my_arr.sort_by {|record| [record."something_in_the_var"]}

Of course, I have fixed filters. But still figuring out how to do it properly.

Thanks for tips

steenslag · Accepted Answer · 2020-04-02 14:46:30Z

1

This is what send does

str = "label"
arr.sort_by{|rec| rec.send(str) }

send is defined on BasicObject, so every object has it.

answered Apr 2, 2020 at 14:46

steenslag

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Comments

xploshioOn · Accepted Answer · 2020-04-02 13:38:17Z

1

you can use something like

sort_by_this = "label"

my_arr.sort_by {|record| [record[sort_by_this]]}

answered Apr 2, 2020 at 13:38

xploshioOn

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1 Comment

Levi Over a year ago

I tried this, I got NoMethodError: undefined method []'` :(

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