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Badarg handle in Erlang

I am very new to Erlang and I am getting a badarg error when I try to convert binary to string like below.

Prefix = binary:bin_to_list(wh_json:get_ne_value(<<"prefix">>, Patterns)),

where Patterns

:

Pattern1--> {[{<<"prefix">>,<<>>},{<<"callerId">>,<<"1001">>},{<<"cid_regex">>,<<"^\\+?1001">>}]}

Pattern2--> {[{<<"prefix">>,<<"12">>},{<<"callerId">>,<<"1001">>},{<<"cid_regex">>,<<"^\\+?1001">>}]}

for Pattern2

it works fine, but for Pattern1

i am getting this error because the prefix doesn't matter in Pattern1

.

So, can anyone tell me how I can handle this situation where the prefix value can be null

or any value, it should work for both conditions.

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1 answer


Make sure to wh_json:get_ne_value

return undefined

before calling binary:bin_to_list

:



Prefix =
    case wh_json:get_ne_value(<<"prefix">>, Patterns) of
        undefined ->
            prefix_not_found;
        BinaryPrefix when is_binary(BinaryPrefix) ->
            binary:bin_to_list(BinaryPrefix)
    end
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