Craft GraphQL APIs in Elixir with Absinthe/

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Tuples

Tuples

Learn how to use tuples in GraphQL.

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Using tuples

Field resolver functions return tuple values to indicate their result:

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def create_item(_, %{input: params}, _) do 
  case Menu.create_item(params) do
     {:error, _} ->
       {:error, "Could not create menu item"}
     {:ok, _} = success -> 
     success
   end 
end

The return value for PlateSlate.Menu.create_item/1 is a tuple and we do a bit of post-processing on the value to return a nicely formatted value for Absinthe to include in the response. Successful values are returned untouched, but error values are replaced with a generic message, “Could not ...