AttributeError: 'str' object has no attribute '_meta' (when using South)

I'm getting this error when I use 'startmigration' in South.

My guess is that I have data that is not serializable.

What is the best way for me to determine the o开发者_运维知识库ffending model?

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I solved this by removing the problematic field, applying the migration, adding the field again and doing another migration.

My problem was an inconsistency with a field name that I renamed and some previous migrations that were trying to find it. What would also probably work (and perhaps a better solution) is to edit the migration scripts in <app>/migrations to match the new field name.

I had to do this when updating the project in the production environment.

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Since something is asking for _meta attribute, then it means, that it expects model (or form, to be preceise, but I believe it's not the case) object, since models have _meta attributes, but you are passing a string. If you more help, you need to present some code, to determine what is wrong.

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Try updating to the latest version of South. There have been some recent fixes for one cause of this.