BeepBeep 和 ErlyDB 集成问题
继续我与 Erlang 和 ErlyDB 的冒险。 我正在尝试让 ErlyDB 与 BeepBeep 一起使用
我的 ErlyDB 设置在 BeepBeep 环境之外运行时可以正常工作（请参阅调试 ErlyDB 和 MySQL）。 我基本上已经获取了工作代码并尝试让它在 BeepBeep 中运行。
我的控制器中有以下代码：
handle_request("index",[]) ->
erlydb:start(mysql,Database),
erlydb:code_gen(["thing.erl"],mysql),
NewThing = thing:new_with([{name, "name"},{value, "value"}]),
thing:save(NewThing),
{render,"home/index.html",[{data,"Hello World!"}]};
当我调用 URL 时，响应输出“服务器错误”。 没有报告其他错误或异常信息。
我尝试将调用包装在 try/catch 中以查看是否存在潜在错误 - 对 thing:new_with() 的调用肯定存在异常，但没有进一步的信息可用。
堆栈跟踪报告：
{thing,new,[["name","value"]]}
{home_controller,create,1}
{home_controller,handle_request,3}
{beepbeep,process_request,4}
{test_web,loop,1}
{mochiweb_http,headers,4}
{proc_lib,init_p_do_apply,3}
Further to my adventures with Erlang and ErlyDB. I am attempting to get ErlyDB working with BeepBeep
My ErlyDB setup works correctly when run outside of the BeepBeep environment (see Debugging ErlyDB and MySQL). I have basically take the working code and attempted to get it running inside BeepBeep.
I have the following code in my controller:
handle_request("index",[]) ->
erlydb:start(mysql,Database),
erlydb:code_gen(["thing.erl"],mysql),
NewThing = thing:new_with([{name, "name"},{value, "value"}]),
thing:save(NewThing),
{render,"home/index.html",[{data,"Hello World!"}]};
When I call the URL, the response outputs "Server Error".
There is no other error or exception information reported.
I have tried wrapping the call in try/catch to see if there is an underlying error - there is definitely an exception at the call to thing:new_with(), but no further information is available.
The stacktrace reports:
{thing,new,[["name","value"]]}
{home_controller,create,1}
{home_controller,handle_request,3}
{beepbeep,process_request,4}
{test_web,loop,1}
{mochiweb_http,headers,4}
{proc_lib,init_p_do_apply,3}
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使用模式匹配来断言事情在调用 thing:new/1 之前正常工作：
您仅包含堆栈跟踪，同时查看异常消息。 我怀疑错误是您收到“undef”异常。 但检查一下是否确实如此。 堆栈跟踪中的第一行表明以 ["name", "value"] 作为参数调用 thing:new/1 时出现问题。
有点奇怪的是，您显示的 handle_request 的一个子句没有按照堆栈跟踪中的
{home_controller,create,1}调用 home_controller:create/1 。 handle_request/2 函数中的其他子句是什么样的？Use pattern matching to assert that things work up to the call to thing:new/1:
You include only the stack trace, look at the exception message as well. I suspect that the error is that you get an 'undef' exception. But check that it is so. The first line in the stack trace indicates that it is a problem with calling thing:new/1 with ["name", "value"] as argument.
It is slightly odd that you show one clause of handle_request that is not calling home_controller:create/1 as per
{home_controller,create,1}in the stack-trace. What do the other clauses in your handle_request/2 function look like?