D

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data mapper
David Siegel ages, the
debug helper
debugging
     ActionPack
     ActiveRecord
     application trace
     breakpoints
     framework trace
     full trace
     inspectors
         debug helper
         FireBug (Firefox extension)
         RJS debugging mode
         Routing Navigator
     instance_variables method
     Integration Session
     Interactive Ruby (Irb)
     interactive shell (console)
     introspection
     log files
     logger
     messages
     print statement (puts)
     Rails default logger
     Rails exceptions
     stack trace
     tail utility
design visability
development log, using
Document Object Model (DOM)
document-centric model
DOM (Document Object Model)
DOM manipulation
     in the Prototype JavaScript framework
Domain Specific Languages (DSLs)
Don't Repeat Yourself
don't trust user input
Drag and Drop functionality
draggables 2nd
dropOnEmpty
droppables 2nd
DRY principle