I am a (not for a while but...) Haskeller but not used to Monads in
Erlang... I have already made use of the maybe_m monad implementation for
validating an API JSON request, that's fine, but for some reason my sign-in
form validation code just meets with a compile error and I can't see why.
It's late. I should stop!!
Here is the full set of code, then the error...
-module(smsengine_web_controller, [Req]).
-compile({parse_transform, do}).
-compile(export_all).
%% @doc The public web controller does not need any authorisation checks.
before_filters(DefaultFilters, _RequestContext) ->
utils:no_auth(DefaultFilters).
%% @doc Home page redirect to the template.
index('GET', []) -> ok.
signin('POST', []) ->
U = Req:post_param("u"),
P = Req:post_param("p"),
do([list_m ||
validate_email(U),
validate_password(P)
]),
{render_other,
[{controller, "web"}, {action, "index"}],
[]}. %% TODO: session start etc
validate_email([]) ->
list_m:return(100);
% list_m:return({email_text, "Please supply a valid email address"});
validate_email(_) ->
list_m:fail([]). %% other validation checks will go here
validate_password([]) ->
list_m:return({password_text, "Please enter your password"});
validate_password(_) ->
list_m:fail([]). %% other validation checks here
And the error:
[error] Error in controller error undef
[{list_m,return,"d",[]},{smsengine_web_controller,'-signin/3-fun-1-',3,[{file,"/Users/seancharles/Documents/bitbucket/smsengine/src/controller/smsengine_web_controller.erl"},{line,33}]},{smsengine_web_controller,signin,3,[{file,"/Users/seancharles/Documents/bitbucket/smsengine/src/controller/smsengine_web_controller.erl"},{line,32}]},{boss_web_controller,call_controller_action,3,[{file,"src/boss/boss_web_controller.erl"},{line,363}]},{boss_web_controller,apply_action,4,[{file,"src/boss/boss_web_controller.erl"},{line,355}]},{boss_web_controller,execute_action_inner,9,[{file,"src/boss/boss_web_controller.erl"},{line,334}]},{boss_web_controller_handle_request,process_dynamic_request,4,[{file,"src/boss/boss_web_controller_handle_request.erl"},{line,242}]},{boss_web_controller_handle_request,process_request,4,[{file,"src/boss/boss_web_controller_handle_request.erl"},{line,228}]}]
My intent was to run the list monad over all of the various validation and
credentials checking functions such that, if all is well I have an empty
list i.e. the user can redirect to the landing page for their account or,
if there is at least one error in the list, that I re-display the sign-in
page and the template shows the errors as and where needed.
It seems to be telling me that the function list_m:return is not defined or
have I got it wrong??
Thanks and goodnight for now.
:)
Sean
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