Add column comment from ActiveRecord::Enum. with enum_help gem.

add_column_comment_from_enum.rb

class AddColumnCommentFromEnum < ActiveRecord::Migration[6.0]
  def up
    table_with_columns.each do |table_name, columns|
      next unless I18n.exists?("enums.#{table_name.singularize}")

      columns.map(&:name).each do |column_name|
        next unless I18n.exists?("enums.#{table_name.singularize}.#{column_name}")

        model = table_name.classify.constantize
        enums = model.send(column_name.pluralize)
        enums_i18n = enums.map { |k, v| [model.send("#{column_name.pluralize}_i18n")[k], v] }
        change_column_comment(
          table_name,
          column_name,
          "#{I18n.t("activerecord.attributes.#{table_name.singularize}.#{column_name}")}:#{enums_i18n.to_h.invert.to_s}",
        )
      end
    end
  end

  def down
    table_with_columns.each do |table_name, columns|
      next unless I18n.exists?("enums.#{table_name.singularize}")

      columns.map(&:name).each do |column_name|
        next unless I18n.exists?("enums.#{table_name.singularize}.#{column_name}")

        change_column_comment(
          table_name,
          column_name,
          I18n.t("activerecord.attributes.#{table_name.singularize}.#{column_name}"),
        )
      end
    end
  end

  private

  def table_with_columns
    system_view_names = %w(
        pg_stat_statements
        geography_columns
        geometry_columns
        raster_columns
        raster_overviews
      )
    tables = ApplicationRecord.connection.tables
    views = ApplicationRecord.connection.views - system_view_names
    (tables + views).each_with_object({}) { |table, hash| hash[table] = ApplicationRecord.connection.columns(table) }
  end

end