| Author |
Message |
< Erlyweb mailing list ~ {replace,..} blocks headers from being sent |
| ketralnis |
 Posted: Tue Nov 06, 2007 4:16 pm |
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User
Joined: 20 Jul 2007
Posts: 151
Location: San Francisco, CA
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I have a login_controller that is addressed by its URL at /login.
Since users get confused by URLs that look like /login/login, I'd
like the 'index' function to behave just like the 'login' function.
(That is, I should be able to accept GET and POST actions at /login/
login and /login.) So I do this:
-module(login_controller).
-export([index/1,
login/1,login/2,
logout/1,
signup/1]).
index(A) -> {replace,{ewc,login,login,[A]}}.
login(A) ->
case yaws_arg:method(A) of
'GET' ->
{data,{[]}};
'POST' ->
[...]
In theory, that makes 'index' do all of the same things as 'login',
by actually {replace}ing itself with 'login'.
This seems to work, except that the controller that calls this one
(myapp_app_controller) actually calls it like this:
case Ewc of
{page,_}=Page ->
Page;
_ ->
{phased, Ewc,
fun(_Ewc, Data) ->
{ewc,
html_container,
[A1,
{ewc,
sidebar_container,
[A1,
{data, Data}]}]}
end}
end.
I do this so that I can send headers from my controller (the 'login'
controller must send set_cookie and {ewr,...}). While this works for /
login/login, trying it for /login or /login/index fails with:
ERROR erlang code crashed:
File: appmod:0
Reason: {invalid_response,
[{header,
{set_cookie,
["myapp_session",61,"5",
59,32,112,97,116,104,61,"/"]}},
{redirect_local,[[],47,"author/show/1941"]}],
"Response values other than 'data' and 'ewc' tuples must
be enclosed a 'response' tuple. In addition, subcomponents may only
return 'data' and/or 'ewc' tuples."}
Req: {http_request,'POST',{abs_path,"/login/index"},{1,1}}
This means that only the content of the {replace}d {ewc,...} has been
replaced, not the other behaviours (such as the ability to send
headers).
Is this a bug, or am I going about it all wrong?
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| Guest |
| Posted: Wed Nov 07, 2007 1:11 am |
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Guest
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On Nov 6, 11:15 am, David King <dk...@ketralnis.com> wrote:
> I have a login_controller that is addressed by its URL at /login.
> Since users get confused by URLs that look like /login/login, I'd
> like the 'index' function to behave just like the 'login' function.
> (That is, I should be able to accept GET and POST actions at /login/
> login and /login.) So I do this:
>
> -module(login_controller).
> -export([index/1,
> login/1,login/2,
> logout/1,
> signup/1]).
> index(A) -> {replace,{ewc,login,login,[A]}}.
> login(A) ->
> case yaws_arg:method(A) of
> 'GET' ->
> {data,{[]}};
> 'POST' ->
> [...]
>
> In theory, that makes 'index' do all of the same things as 'login',
> by actually {replace}ing itself with 'login'.
I actually had the same problem a couple of months ago. It and other
things are discussed in this thread:
http://groups.google.com/group/erlyweb/browse_thread/thread/68535fdf10e41e9d
Scroll down until you see my post starting with "Okay, I finally
understand." That post describes the same problem you're seeing, and
Yariv's reply right after it describes the solution.
To save you time, though, it basically boils down to replace tuples
being rendered as subcomponents, which aren't allowed to return
anything but data and ewc tuples. The solution is to have index/1
call login/1 directly, rather than using a replace tuple. You'll then
have to do the same in the view code.
-Bryan
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