update: this will crash if you use ",: require => false". Deletion of this parameter is performed as expected.
Does this really have to work?
~/Projects/test (master) $ rake db:structure:dump
(in /Users/plentz/Projects/test)
rake aborted!
Task not supported by 'oracle_enhanced'
(See full trace by running task with --trace)
Gemfile
gem 'activerecord-oracle_enhanced-adapter', :require => false
Using activerecord-oracle_enhanced-adapter (1.3.2)
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