useful docs of symfony

URL http://andreiabohner.files.wordpress.com/2007/08/sfmodelfirstpartrefcard.pdf
this is about database model, the files, locations and etc

URL http://andreiabohner.files.wordpress.com/2007/09/sfmodelsecondpartrefcard.pdf
this is about database schema, it's a detailed example of schema.yml with explanation of  each item.

URL http://andreiabohner.files.wordpress.com/2008/01/sfmodelcriteriacriterionrsrefcard_enus.pdf
this is about the criteria / criterion / RS
full doc and example