[erlang-questions] Can't create schema in Mnesia

Ludovic Demblans <>
Sun Jan 19 03:38:38 CET 2014


Hi,

Could give us what is the result of  
rp(lists:sort(mnesia:module_info(exports))). in the shell ?

Maybe the mnesia library is not installed ?

- lud

Le Sun, 19 Jan 2014 03:35:57 +0100, Yves S. Garret  
<> a écrit:

> Done, no change:
>
> 19> c(mnes).
> {ok,mnes}
> 20> rr("records.hrl").
> [planemo,tower]
> 21> mnes:setup().
> ** exception error: undefined function mnesia:create_schema/1
>      in function  mnes:setup/0 (mnes.erl, line 24)
>
> Here is records.hrl:
> http://bin.cakephp.org/view/1897069453
>
>
> On Sat, Jan 18, 2014 at 9:32 PM, Bob Ippolito <> wrote:
>
>> Rename the module to something other than mnesia, there's a flat module
>> namespace and only one module named mnesia can be loaded at a time.
>>
>>
>> On Saturday, January 18, 2014, Yves S. Garret  
>> <>
>> wrote:
>>
>>> Hello all,
>>>
>>> I have the following code:
>>> http://bin.cakephp.org/view/2135184996
>>>
>>> When I compile and reload the records, this is what happens:
>>>
>>> 14> c(mnesia).
>>> {ok,mnesia}
>>> 15> rr("records.hrl").
>>> [planemo,tower]
>>> 16> mnesia:setup().
>>> ** exception error: undefined function mnesia:create_schema/1
>>>      in function  mnesia:setup/0 (mnesia.erl, line 25)
>>>
>>> The function _does_ exist in the mnesia module.  I checked the docs and
>>> I'm running 16B03, so it's there.  But why this error?
>>>
>>> Also, I have an another question.  Lets say I'm testing some code and I
>>> comment out where I'm calling a function (located in the same file.)   
>>> How
>>> can I tell the compiler to not worry about this file not being  
>>> called?  I
>>> know I can for variables such as _Variable, but methods?
>>>
>>


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