BTW, I am using the current CB master for OTP 18, and running erlang 18.1.
On Friday, February 19, 2016 at 6:35:41 PM UTC-5, Bill Norman wrote:
>
> Hello,
>
> I am currently going through the 'Evening with Chicago Boss tutorial.
>
> I am following instructions for handling user authentication and have
> implemented this code fragment in the
> controller/evening_user_controller.erl:
>
>
> 1. login('POST', []) ->
> 2. Name = Req:post_param("name"),
> 3. case boss_db:find(ward_boss, [{name, Name}], [{limit,1}]) of
> 4. [WardBoss] ->
> 5. case WardBoss:check_password(Req:post_param("password")) of
> 6. true ->
> 7. {redirect, proplists:get_value("redirect",
> 8. Req:post_params(), "/"),
> WardBoss:login_cookies()};
> 9. false ->
> 10. {ok, [{error, "Bad name/password combination"}]}
> 11. end;
> 12. [] ->
> 13. {ok, [{error, "No Ward Boss named " ++ Name}]}
> 14. end.
>
> My issue is that the value of the redirect (lines 7 & 8) calculates to the
> default value "/" in proplists:get_value/3.
>
> The return value of Req:post_params() is:
> [{<<"name">>,<<"Bathhouse John">>},
> {<<"password">>,<<"password">>},
> {<<"redirect">>,<<"http://localhost:8001/voter/list";>>}]
>
> so querying this list with proplists:get_value("redirect", Req:post_params())
> returns undefined.
>
> I modified the code to:
> binary_to_list(proplists:get_value(list_to_binary("redirect"),
> Req:post_params()))
>
> This works but it is awfully ugly.
>
> Is there a helper method in Chicago Boss or a more elegant erlang conversion
> term
> I could use to handle the binary tuples returned by Req:get_params()?
>
> What has changed since this tutorial was written? Has the output of
> Req:get_params()
> changed?
>
> Thanks
>
>
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