Fix when assigning nested attributes raises "undefined method `to_sym' for nil:NilClass"

Henning Koch

March 05, 2014Software engineer at makandra GmbH

You might have a table without a primary key set in MySQL.

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You can fix this by adding a primary key index to the guilty MySQL table, or by setting self.primary_key = "id" in your class definition.

Related, but different issue: Rails 2 does not find an association when it is named with a string instead of a symbol

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Posted by Henning Koch to makandra dev (2014-03-05 15:29)