Ajax on Rails

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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