So, perhaps you've set up a fancy application using padrino, datamapper and sqlite and you are going great guns until
padrino rake dm:migrate => Executing Rake dm:migrate ... rake aborted! uninitialized constant TextOr something similar - the datatype is probably not too important. The solution is to edit your migration and put the datatype into quotes....like this:
column :description, "TEXT"There seems to be a bug with the use of datamapper and the migration. I'm not sure where the bug is, but this fixes it!