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Superfast reverse geocoding for city-level.

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ex_fast_rgc lib fast_rgc meta.ex
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lib/fast_rgc/meta.ex

defmodule FastRGC.MetaData do
@moduledoc false
@metadata :ex_fast_rgc
|> Application.app_dir("priv")
|> Path.join("china.meta.json")
|> File.read!()
|> Poison.decode!()
def query(id) when is_number(id) do
Map.get(@metadata, to_string(id))
end
def query(id) when is_binary(id) do
Map.get(@metadata, id)
end
end