Error in boss_db?

[Graeme Defty]

Another interesting one...

One of my models was returning 'undefined' in response to boss_db:find/1

I tracked it down to boss_db:find/2, part of which looks like this:

<pre>

find(Key, Timeout) when is_list(Key), is_integer(Timeout) ->
    [IdToken|Rest] = string:tokens(Key, "."),
    case db_call({find, IdToken}, Timeout) of
        undefined -> undefined;
        {error, Reason} -> {error, Reason};
        BossRecord -> BossRecord:get(string:join(Rest, "."))
    end;</pre>

For some reason the BossRecord:get call on the second last line was returning 'undefined' on one of my models. (I didnt try them all, but 8-10 others I tried were fine!)

I fixed the problem by changing the code as follows:

<pre>

find(Key, Timeout) when is_list(Key), is_integer(Timeout) ->
    [IdToken|Rest] = string:tokens(Key, "."),
    case db_call({find, IdToken}, Timeout) of
        undefined -> undefined;
        {error, Reason} -> {error, Reason};
        BossRecord ->
            case Rest of
                []    ->    BossRecord;
                _    ->    BossRecord:get(string:join(Rest, "."))
            end
    end;

</pre>

I have no idea if this is a good solution (though it looks reasonable) and I am also equally puzzled by the fact that it only happened with one of my models, but then I dont know what the 'get' function is supposed to do. Perhaps someone wiser than I . . . .

g

[can2nac]

check deeply nested values section of manual http://www.chicagoboss.org/api-record.html

get(Path::string()) -> Value

Returns a deeply nested value described by a dot-separated Path (e.g. "puppy.mother.name")

[Graeme Defty]

Ah OK Thanks.

That is a bit of functionality which has slipped by me.

I am still not sure why my one model does not like the get/1 function (and I really do not like not understanding things), but this is enough to convince me that my solution is reasonable. No sense calling the get/1 function if there is no 'Rest' part, right?

g

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