I know how to use Enum.group_by with one column, but I’m not sure how to use it with multi columns.
Following example is group_by(id).
input = %{
"1" => [
%{id: "1", seq: "1", lang: "Elixir", name: "Bob"},
%{id: "1", seq: "1", lang: "Java", name: "Bob"},
%{id: "1", seq: "2", lang: "Ruby", name: "Bob"}
],
"2" => [
%{id: "2", seq: "1", lang: "Elixir", name: "Tom"},
%{id: "2", seq: "2", lang: "C#", name: "Tom"}
],
"3" => [
%{id: "3", seq: "1", lang: "Python", name: "Dave"},
%{id: "3", seq: "1", lang: "Java", name: "Dave"},
%{id: "3", seq: "2", lang: "Ruby", name: "Dave"}
],
"4" => [%{id: "4", seq: "1", lang: "Python", name: "Jane"}]
}
I would like to make group_by with id & seq, in this case.
Is there any idea for it?