At the Forge - Shoehorning Data into a Database
Not all data fits cleanly into two-dimensional tables. When this occurs, you can try to shoehorn your data into an inappropriate container. Or, you can try to use the help that is built in to one or more levels of your software stack. If you use PostgreSQL, inheritance can be really useful. If you use Rails, you can take advantage of polymorphic associations, allowing you to treat two or more models with a common API as similar. This isn't the sort of thing you'll do each day, but it's a useful skill to have on hand for cases when you need to take unusual data.
To learn how PostgreSQL allows for inheritance, read the on-line manual at www.postgresql.org/docs/8.3/static/ddl-inherit.html.
Rails Cookbook, by Rob Orsini, and published by O'Reilly, has some good information about polymorhphic associations.
The Rails Wiki has some good examples and descriptions of polymorhphic associations at wiki.rubyonrails.org/rails/pages/UnderstandingPolymorphicAssociations.
Reuven M. Lerner, a longtime Web/database developer and consultant, is a PhD candidate in learning sciences at Northwestern University, studying on-line learning communities. He recently returned (with his wife and three children) to their home in Modi'in, Israel, after four years in the Chicago area.
|Natalie Rusk's Scratch Coding Cards (No Starch Press)||Feb 17, 2017|
|Own Your DNS Data||Feb 16, 2017|
|IGEL Universal Desktop Converter||Feb 15, 2017|
|Simple Server Hardening||Feb 14, 2017|
|Server Technology's HDOT Alt-Phase Switched POPS PDU||Feb 13, 2017|
|Bash Shell Script: Building a Better March Madness Bracket||Feb 09, 2017|
- Own Your DNS Data
- Simple Server Hardening
- Teradici's Cloud Access Platform: "Plug & Play" Cloud for the Enterprise
- Understanding Firewalld in Multi-Zone Configurations
- From vs. to + for Microsoft and Linux
- Natalie Rusk's Scratch Coding Cards (No Starch Press)
- Server Technology's HDOT Alt-Phase Switched POPS PDU
- The Weather Outside Is Frightful (Or Is It?)
- IGEL Universal Desktop Converter
- Bash Shell Script: Building a Better March Madness Bracket