更新仙丹地圖

Question

有它：

[%{"id" => "1", "name" => "foo"}, 
%{"id" => "2","name" => "bar"}] 

如何把它轉換爲是這樣的：

[%"foo" => %{"id" => "1","name" => "foo"}, 
%"bar" => {"id" => "2","name" => "bar"}] 

Answer 1

假設你想Map與String鍵，你可以使用for與into:是這樣的：

iex(1)> entries = [%{"id" => "1", "name" => "foo"}, %{"id" => "2","name" => "bar"}] 
[%{"id" => "1", "name" => "foo"}, %{"id" => "2", "name" => "bar"}] 
iex(2)> for %{"name" => name} = entry <- entries, into: %{}, do: {name, entry} 
%{"bar" => %{"id" => "2", "name" => "bar"}, 
    "foo" => %{"id" => "1", "name" => "foo"}}