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Undefined 'define_a_column' method when using Rail's Oracle OCI adapter?

One of the first hurdles I ran into when I started with Rails migrations was:
undefined method define_a_column' for class OCI8::Cursor'

It means that your LD_LIBRARY_PATH environment variable does not include the Oracle client binaries.

(I got my clue on how to solve this issue from this old defect ticket on the Rails Trac).

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