database_info.rb

tables_and_columns = []
ActiveRecord::Base.connection.tables.count
ActiveRecord::Base.connection.tables.each do |table_name|
  count = ActiveRecord::Base.connection.columns(table_name).count
  tables_and_columns << { table_name: table_name, column_count: count }
end

tables_and_columns.sort_by! { |tc| tc[:table_name] }
tables_and_columns.each { |tc| puts "#{tc[:table_name]}, #{tc[:column_count]}" }