更新elixir地图

Question

拥有它：

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

如何将其转换为以下内容：

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

Answer 1

假设您需要Map String个密钥，可以for使用into:，如下所示：

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"}}