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I get this when trying to run the migration:
Mysql2::Error: Duplicate entry ‘repeat’ for key ‘index_industries_on_name’:
CREATE UNIQUE INDEX `index_industries_on_name` ON `industries` (`name`)
Migration is add_index :industries, :name, {:unique => true}
You have two or more rows with
"repeat"as the industry name. You cannot make thenamecolumn of yourindustriestable unique until you fix this.