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

Yves S. Garret <>
Sun Jan 19 14:30:42 CET 2014


You're absolutely right.  The paths were totally different.  I restarted
the Erlang virtual machine and it works well now.

Thank you.


On Sat, Jan 18, 2014 at 10:37 PM, Bob Ippolito <> wrote:

> 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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