Magik.Params.plug_srub

You're seeing just the function plug_srub, go back to Magik.Params module for more information.
Link to this function

plug_srub(conn, keys \\ [])

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A plug which do srubbing params

Use in Router

defmodule MyApp.Router do
  ...
  plug Magik.Params.plug_srub
  ...
end

Use in controller

plug Magik.Params.plug_srub when action in [:index, :show]
# or specify which field to scrub
plug Magik.Params.plug_srub, ["id", "keyword"] when action in [:index, :show]