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surveyed
2006 Jun 30
0
Three ActiveRecord features we want at work - any comments/suggestions?
...osed in the PDF by Darwen, referenced
above. Basically instead of using a flag (ie NULL) in each table to
indicate a missing value, you use a separate table to record why the
information is not available.
For example consider the following table:
SurveyResult: { id, name, address, age, sex, survey_date,
feedback_comments, follow_up_comments }
assuming the following business rules:
A survey result must contain name, address, feedback_comments and
survey_date
A survey result must have name and address deleted two years after
survey_date (to comply with some data law)
A survey respondent m...