Jeff,
If you are using erlydb 0.7.x try editing the mnesia driver source
file src/erlydb/erlydb_mnesia.erl, look for the function get_metadata/
1 and change the return value from {ok,Tree} to Tree. That should
solve your compile problem (after recompiling erlydb of course).
From 0.6 to 0.7 there was an internal api change and the mnesia
driver got left behind -- I guess not to many people are using erlyweb
with the mnesia driver :( There was a patch for this but I'm not sure
if it made it to the main stream.
Hope this helps,
John
On Nov 13, 2008, at 2:17 PM, jm wrote:
>
>
> The error below is the result of trying to use mnesia as the back end
> database. Mnesia was chosen for this as it was already used for
> another
> erlang application and this is suppose to be the web front end to it.
> The table is created successfully using similar code to that defined
> below (the record_info/2 function call is replaced manually with [id,
> username, password, roles] and Nodes is replaced by [nodes()] to run
> it
> from the shell). The module is otherwise empty except for the copiler
> directives. When it comes to compiling it complains of "no function
> clause matching" (see further down in this message for the dump). Any
> thought or suggestions on how to correct this?
>
> Also, what should the {Field, {Type, Modifier}, Null, Key, Default,
> Extra, MnesiaType} be for record element roles if it's to be a list of
> atoms?
>
> Jeff.
>
> %% mgr_user.erl
> -record(mgr_user, {
> id,
> username,
> password,
> roles = [] %% roles take the form
> module_action
> }).
>
>
> create_table(Nodes) when is_list(Nodes) ->
> mnesia:create_table(counter, [{disc_copies, Nodes}, {attributes,
> [key, counter]}]),
> mnesia:create_table(mgr_user, [{disc_copies, Nodes},
> {attributes, record_info(fields,
> mgr_user)},
> {user_properties,
> [
> %% {Field, {Type, Modifier},
> Null, Key, Default, Extra, MnesiaType}
> %% {id,
> {integer,undefined},false,primary,undefined,undefined,integer},
> {username,
> {varchar,undefined},false,undefined,undefined,undefined,list},
> {password,
> {varchar,undefined},false,undefined,undefined,undefined,list},
> {roles,
> {varchar,undefined},false,undefined,undefined,undefined,list}
> ]
> }
> ]),
> mnesia:dirty_update_counter(counter, mgr_user, 1).
>
>> erlyweb:compile("mgr_erlyweb",[{erlydb_driver, mnesia}]).
> debug:erlyweb_compile:379: Compiling Erlang file "mgr_user_controller"
> debug:erlyweb_compile:379: Compiling Erlang file "mgr_user"
> debug:erlyweb_compile:114: Generating ErlyDB code for models:
> "mgr_user.erl "
> debug:erlydb:355:
>
> --- To skip foreign key checks, compile with the {skip_fk_checks,
> true}
> option
>
>
> ** exception error: no function clause matching
> gb_trees:lookup_1(mgr_user,
> {3,
> {mgr_user,
>
> [{erlydb_field,username,"username",<<"username">>,
>
> varchar,undefined,binary,text_field,false,undefined,
>
> undefined,undefined,undefined},
> ....
> in function erlydb:gen_module_code/5
> in call from lists:foreach/2
> in call from erlyweb_compile:compile/2
>
>
> >
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