ActiveRecord: List columns in table from console
This will list the column_names from a table
Model.column_namese.g. User.column_names
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}" endendSample output: http://screencast.com/t/EsNlvJEqM
Using rails three you can just type the model name:
> Usergives:User(id: integer, name: string, email: string, etc...)In rails four, you need to establish a connection first:
irb(main):001:0> User=> User (call 'User.connection' to establish a connection)irb(main):002:0> User.connection; nil #call nil to stop repl spitting out the connection object (long)=> nilirb(main):003:0> UserUser(id: integer, name: string, email: string, etc...)