config/initializers/mysql_utf8mb4.rb


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# https://github.com/rails/rails/issues/9855#issuecomment-28874587
require 'active_record/connection_adapters/abstract_mysql_adapter'

module ActiveRecord
  module ConnectionAdapters
    class AbstractMysqlAdapter
      NATIVE_DATABASE_TYPES[:string] = { :name => "varchar", :limit => 191 }
    end
  end
end