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POstring:str for string from database
 

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    <p>I have model with some fields. I want to get string field from mongodb and get substring. I'm trying: My get_items code. Here is important just one line with filter.</p> <pre><code>get_items('GET', []) -&gt; Items = boss_db:find(item, []), S = Req:query_param("start"), F = Req:query_param("finish"), Start = string_to_datetime(S), Finish = string_to_datetime(F), Fitems = filter(Items, Start, Finish, []), {json, [{items, Fitems}]}. </code></pre> <p>create_item code. My datetime using my own function.</p> <pre><code>create_item('POST', []) -&gt; Lastname = Req:post_param("lastname"), User = hd(boss_db:find(consumer, [{lastname, Lastname}])), DateTime = datetime_to_string(calendar:now_to_local_time(erlang:now())), Type = Req:post_param("type"), IdType = Req:post_param("idtype"), Item = item:new(id, User:id(), DateTime, Type, IdType), case Item:save() of {ok, SavedItem} -&gt; {json, [{status, "ok"}]}; {error, Reason} -&gt; {json, [{error, Reason}]} end. </code></pre> <p>My function to converting datetime to string.</p> <pre><code>datetime_to_string({{YY, MM, DD}, {Hour, Min, Sec}}) -&gt; io_lib:format("~4..0w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w", [YY, MM, DD, Hour, Min, Sec]). </code></pre> <p>My function to converting string to datetime.</p> <pre><code>string_to_datetime(S) -&gt; {YY, _} = string:to_integer(string:substr(S, 1, 4)), {MM, _} = string:to_integer(string:substr(S, 6, 2)), {DD, _} = string:to_integer(string:substr(S, 9, 2)), {Hour, _} = string:to_integer(string:substr(S, 12, 2)), {Min, _} = string:to_integer(string:substr(S, 15, 2)), {Sec, _} = string:to_integer(string:substr(S, 18, 2)), {{YY, MM, DD}, {Hour, Min, Sec}}. </code></pre> <p>My filter method.</p> <pre><code>filter([], Start, Finish, Acc) -&gt; Acc; filter([Model|Models], Start, Finish, Acc) -&gt; DateTime = string_to_datetime(Model:datetime()), {D1, _} = calendar:time_difference(Start, DateTime), {D2, _} = calendar:time_difference(DateTime, Finish), if D1 &gt;= 0, D2 &gt;= 0 -&gt; filter(Models, Start, Finish, [Model | Acc]); true -&gt; filter(Models, Start, Finish, Acc) end. </code></pre> <p>And I have the error:</p> <pre><code>{function_clause, [{string,substr2, [&lt;&lt;"2013-12-17 18:36:42"&gt;&gt;,1], [{file,"string.erl"},{line,213}]}, {string,substr,3,[{file,"string.erl"},{line,208}]}, {cb_tracker_main_controller,string_to_datetime,2, </code></pre> <p>Please, help me.</p>
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