| Author |
Message |
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| Guest |
 Posted: Mon Dec 01, 2008 5:44 am |
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Guest
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Hi all,
Just getting started with erlyweb. I'm currently using the same form
in my views for both new and edit:
<%@ new(Friend) %>
<h2>Create Friend</h2>
<b><% friends:value(friends:first_name(Friend)) %></b><br/>
<form method="post" action="/friends/create">
<input type="submit" value="Create" />
</form>
<% a([".."], "Back") %>
<%@ edit({Friend}) %>
<h2>Edit Friend</h2>
<form method="post" action="/friends/edit">
<% friend_form(Friend) %>
<input type="submit" value="Edit" />
</form>
<% a([".."], "Back") %>
<%@ friend_form(Friend) %>
<table>
<% friend_field(Friend, first_name) %>
<% friend_field(Friend, last_name) %>
<% friend_field(Friend, picture) %>
</table>
<%@ friend_field(Friend, FieldName) %>
<tr>
<td>
<input type="text"
name="<% atom_to_list(FieldName) %>"
value="<% friends:FieldName(Friend) %>" />
</td>
</tr>
This doesn't work for the new page since the FieldName for a Friend is
empty. What do I do so that I can use the same form code for both new
and edit, so that it doesn't crash the code?
I've tried using this function instead of calling friends:FieldName
(Friend) directly:
value(Val) ->
case Val of
undefined ->
"";
_ ->
Val
end.
But it craps out with:
ERROR erlang code crashed:
File: appmod:0
Reason: {badarg,[{erlydb_base,get,2},
{erlyweb,'-render_response_body/7-fun-0-',6},
{erlyweb,'-render_response_body/7-fun-1-',3},
{lists,map,2},
{erlyweb,render_response_body,7},
{erlyweb,handle_request,6},
{yaws_server,deliver_dyn_part,8},
{yaws_server,aloop,3}]}
Req: {http_request,'GET',{abs_path,"/myapp/friends/new"},{1,1}}
What am I doing wrong?
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| Guest |
| Posted: Mon Dec 01, 2008 8:54 pm |
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Guest
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Can you double check that the 'friends' module has all the functions
('first_name', 'last_name', and 'picture')? Otherwise the code looks
good I think.
Btw, you should consider instead of passing the 'Friend' object to the
view to pass a function instead that lets the view indirectly access
the Friend object's field. E.g. instead of returning from the
controller function
{data, Friend}
return
{data, fun(Field) -> erlydb_base:field_to_iolist(Friend:Field()) end}
(field_to_iolist() knows how to convert erlydb field values to iolists).
Then, in the view, you can have snippets such as
<%@ show(Friend) %>name: <% Friend(name) %>
which is nicer I think than the original style.
Yariv
On Sun, Nov 30, 2008 at 9:44 PM, Wilhelm <iamwil@gmail.com> wrote:
>
> Hi all,
>
> Just getting started with erlyweb. I'm currently using the same form
> in my views for both new and edit:
>
> <%@ new(Friend) %>
> <h2>Create Friend</h2>
> <b><% friends:value(friends:first_name(Friend)) %></b><br/>
> <form method="post" action="/friends/create">
> <input type="submit" value="Create" />
> </form>
> <% a([".."], "Back") %>
>
> <%@ edit({Friend}) %>
> <h2>Edit Friend</h2>
> <form method="post" action="/friends/edit">
> <% friend_form(Friend) %>
> <input type="submit" value="Edit" />
> </form>
> <% a([".."], "Back") %>
>
> <%@ friend_form(Friend) %>
> <table>
> <% friend_field(Friend, first_name) %>
> <% friend_field(Friend, last_name) %>
> <% friend_field(Friend, picture) %>
> </table>
>
> <%@ friend_field(Friend, FieldName) %>
> <tr>
> <td>
> <input type="text"
> name="<% atom_to_list(FieldName) %>"
> value="<% friends:FieldName(Friend) %>" />
> </td>
> </tr>
>
> This doesn't work for the new page since the FieldName for a Friend is
> empty. What do I do so that I can use the same form code for both new
> and edit, so that it doesn't crash the code?
>
> I've tried using this function instead of calling friends:FieldName
> (Friend) directly:
>
> value(Val) ->
> case Val of
> undefined ->
> "";
> _ ->
> Val
> end.
>
> But it craps out with:
> ERROR erlang code crashed:
> File: appmod:0
> Reason: {badarg,[{erlydb_base,get,2},
> {erlyweb,'-render_response_body/7-fun-0-',6},
> {erlyweb,'-render_response_body/7-fun-1-',3},
> {lists,map,2},
> {erlyweb,render_response_body,7},
> {erlyweb,handle_request,6},
> {yaws_server,deliver_dyn_part,8},
> {yaws_server,aloop,3}]}
> Req: {http_request,'GET',{abs_path,"/myapp/friends/new"},{1,1}}
>
> What am I doing wrong?
>
> >
>
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| wailian |
| Posted: Tue Mar 20, 2012 2:42 am |
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Guest
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