couchdb-erl-view-001.erl

%% Map Function
%% 
%% This map function will output the doc.name as the key
%% and the doc.value as the value of that key.
%% 
%% In javascript the code would look like:
%%
%% function(doc) {
%%     if (doc.name && doc.value) {
%%         emit(doc.name, doc.value);
%%     }
%% }
fun({Doc}) ->
    Emitter = fun(Doc) ->
        Name        = proplists:get_value(<<"name">>,    Doc, null),
        Value       = proplists:get_value(<<"value">>,   Doc),

        Emit(Name, Value)
    end,

    HasRequiredFields = fun(Doc) ->
        case {proplists:is_defined(<<"name">>, Doc), proplists:is_defined(<<"value">>, Doc)} of
            {true, true} ->

                %% In the second post we are going to introduce some integer validation here.
                Emitter(Doc);
            _->
                false
        end
    end,

    HasRequiredFields(Doc)
end.