ActiveRecord: List columns in table from console

This gets the columns, not just the column names and uses ActiveRecord::Base::Connection, so no models are necessary. Handy for quickly outputting the structure of a db.

ActiveRecord::Base.connection.tables.each do |table_name|
  puts table_name
  ActiveRecord::Base.connection.columns(table_name).each do |c| 
    puts "- #{c.name}: #{c.type} #{c.limit}"
  end
end

Sample output: http://screencast.com/t/EsNlvJEqM

This will list the column_names from a table

Model.column_names
e.g. User.column_names