An example implementation of using Absinthe's batch/3 helper function to batch queries together for efficiency when resolving field values.
I wrote more about this in a blog post, Efficiently querying data in batches using Absinthe.
git clone https://github.com/sevenseacat/absinthe-query-batching.git
cd absinthe-query-batching
mix deps.get
mix ecto.setup
mix phx.server
And you can visit the GraphiQL interface at https://localhost:4000/graphiql