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I'm using the Devise authentication gem in my Rails project, and I want to change the keys it's using in flash alerts. (Devise uses :notice and :alert flash keys, but I want to change them to :success and :error so that I can display nice green/red boxes with Bootstrap .) So I want to be able to somehow override the set_flash_message method in DeviseController . Here's the new method: def set_flash_message(key, kind, options = {}) if key == 'alert' key = 'error' elsif key == 'notice' key = 'success' end message = find_message(kind, options) flash[key] = message if message.present? end But I just don't know where to put it. UPDATE: Based on an answer I created a config/initializers/overrides.rb file with the following code: class DeviseController def set_flash_message(key, kind, options = {}) if key == 'alert' key = 'error' elsif key == 'notice' key = 'success' end message = find_message(kind, options) flash[key] = message if message.present? end end But this causes an error on every Devise action: Routing Error: undefined method 'prepend_before_filter' for Devise::SessionsController:Class

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