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absinthe lib absinthe middleware map_get.ex
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lib/absinthe/middleware/map_get.ex 

defmodule Absinthe.Middleware.MapGet do

  @moduledoc """

  This is the default middleware. It assumes the the object it receives is a map

  and uses `Map.get/2` to get the value for this field. If this field is already

  marked as resolved, then this middleware does not touch it.



  If you want to replace this middleware you should use

  `Absinthe.Schema.replace_default/4`

  """



  @behaviour Absinthe.Middleware



  def call(%{state: :unresolved, source: source} = res, key) do

    %{res | state: :resolved, value: Map.get(source, key)}

  end



  def call(res, _key), do: res

end