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Return undefined instead of failing or returning "" when a value doesn't exist.

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This commit is contained in:
Loïc Hoguin 2011-03-27 13:11:57 +02:00
parent d0d9b0e8b3
commit 150723ca21
1 changed files with 12 additions and 8 deletions
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20
src/cowboy_http_req.erl
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@ -71,13 +71,15 @@ raw_path(Req) ->
{Req#http_req.raw_path, Req}.
-spec qs_val(Name::string(), Req::#http_req{})
-> {Value::string() | true, Req::#http_req{}}.
-> {Value::string() | true | undefined, Req::#http_req{}}.
qs_val(Name, Req=#http_req{raw_qs=RawQs, qs_vals=undefined}) ->
QsVals = parse_qs(RawQs),
qs_val(Name, Req#http_req{qs_vals=QsVals});
qs_val(Name, Req) ->
{Name, Value} = lists:keyfind(Name, 1, Req#http_req.qs_vals),
{Value, Req}.
case lists:keyfind(Name, 1, Req#http_req.qs_vals) of
{Name, Value} -> {Value, Req};
false -> {undefined, Req}
end.
-spec qs_val(Name::string(), Default::term(), Req::#http_req{})
-> {Value::string() | term() | true, Req::#http_req{}}.
@ -101,10 +103,12 @@ raw_qs(Req) ->
{Req#http_req.raw_qs, Req}.
-spec binding(Name::atom(), Req::#http_req{})
-> {Value::string(), Req::#http_req{}}.
-> {Value::string() | undefined, Req::#http_req{}}.
binding(Name, Req) ->
{Name, Value} = lists:keyfind(Name, 1, Req#http_req.bindings),
{Value, Req}.
case lists:keyfind(Name, 1, Req#http_req.bindings) of
{Name, Value} -> {Value, Req};
false -> {undefined, Req}
end.
-spec binding(Name::atom(), Default::term(), Req::#http_req{})
-> {Value::string() | term(), Req::#http_req{}}.
@ -118,11 +122,11 @@ bindings(Req) ->
{Req#http_req.bindings, Req}.
-spec header(Name::atom() | string(), Req::#http_req{})
-> {Value::string(), Req::#http_req{}}.
-> {Value::string() | undefined, Req::#http_req{}}.
header(Name, Req) ->
case lists:keyfind(Name, 1, Req#http_req.headers) of
{Name, Value} -> {Value, Req};
false -> {"", Req}
false -> {undefined, Req}
end.
-spec header(Name::atom() | string(), Default::term(), Req::#http_req{})