Set maximum length for post titles to 150 characters
Add all necessary scopes and methods
Use DataMapper models instead of Mongoid
Add markdown transformation and YARD doc blocks
Add slug validation and automatic slug creation
Replace Factory Girl with own factory helper (Factory Girl has some issues with DataMapper :( )
Remove unnecessary class name
Add default publishing date if none is there, some field renaming and show error messages if record could not be saved
Adjust specs