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

Bob Ippolito <>
Sun Jan 19 04:37:17 CET 2014


I think you should check again, I believe you have made a mistake. You will
only get this error and see that output if you have a mnesia.beam on the
code path that is not the one that ships with Erlang. Having only a setup/0
export makes it extremely likely that this is the original mnesia.beam that
would be produced from the mnesia.erl that you pasted earlier in this
thread.

Try evaluating code:which(mnesia). If it doesn't show the same directory as
code:which(mnesia_locker) then you will know which beam file to delete.


On Sat, Jan 18, 2014 at 7:05 PM, Yves S. Garret
<>wrote:

> @ Bob Ippolito, I tried that, the same result, the same error as described
> previously.
>
> ---------- Forwarded message ----------
> From: Yves S. Garret <>
> Date: Sat, Jan 18, 2014 at 10:03 PM
> Subject: Fwd: [erlang-questions] Can't create schema in Mnesia
> To: "" <>
>
>
> @ *Ludovic Demblans, sure.*
>
> 29> rp(lists:sort(mnesia:module_info(exports))).
> [{module_info,0},{module_info,1},{setup,0}]
> ok
>
>
> ---------- Forwarded message ----------
> From: Yves S. Garret <>
> Date: Sat, Jan 18, 2014 at 9:35 PM
> Subject: Re: [erlang-questions] Can't create schema in Mnesia
> To: Bob Ippolito <>
> Cc: "" <>
>
>
> 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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> 
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>
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