List record count for all tables

database_report.rb

class DatabaseReport
  def entry_counts
    table_model_names.map do |model_name|
      entity = model_name.constantize rescue nil
      next if entity.nil?
      { entity.to_s => entity.count }
    end.compact
  end

  private

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