Field Count mismatch exception?

[Christoph Blank]

Hi there,

Does anyone know what this Datamapper/mysql exception means?

ArgumentError (Field-count mismatch. Expected 1 fields, but the query yielded 8):

It happens not regularly, so I have no idea what it means

Shortly after it I get

DataObjects::SQLError (Lost connection to MySQL server during query)

Thanks a lot,

Christoph

[Christoph Blank]

anyone?

[christian]

yes, I have seen this before when I used mysql. we had a short discussion on it recently. it looks like concurrency problem (the guess on my side), but access to the DB should be per thread.

no solution. in my case it was on rails startup where there were some DB access in the init scripts (for configurations). so I could work around it with a "retry" or so.

so that is all I can tell you and I never saw with sqlite3 or postgres !!!

[Alper Akgün]

your running datamapper model has 1 field, but the database has 8. you must migrate your database each time you change your model and then restart your app. Jus a guess. Some code here might help.

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[Christoph Blank]

Hi,

There are no pending migrations... so this cannot be the cause.

I think it is rather a connection issue..