Count all rows from all tables on rails

count_database_rows.rb

class DatabaseReport
  def entry_counts
    tables = table_model_names.map do |model_name|
      entity = model_name.constantize rescue nil
      next if entity.nil?
      [entity.to_s, entity.count]
    end.compact
    total = tables.reduce(0) do |acc, curr|
      puts "#{curr[0]}: #{curr[1]}"
      acc + curr[1]
    end
    puts "Total: #{total}"
  end

  private

  def table_model_names
    ActiveRecord::Base.connection.tables.map(&:singularize).map(&:camelize)
  end
end

DatabaseReport.new.entry_counts