thanks can2nac, I tried it and it seems to work okay while using mock
database. I'm not sure if it was behind all the problems I was having when
I tried to change to Mnesia. It didn't seem to be a problem with Mongodb
for me either.
I cast the fields to string using '::string()' in the model definition for
vote, and then the empty field I defined using "" it it wasn't the same
type via the little function:
optional_belongs(DataId, Type) ->
case head(string:tokens(DataId, "-")) =:= Type of
true ->
DataId;
false ->
""
end.
head([H|_]) -> H.
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