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Concurrent update on record
- how the database handles it
- how your applications handles it
- how we can prevent data loss from that
A solution: full lock
- have a single point of edition
- lock at the application level whenever the edit page is opened
- pro: consistent
- cons: doesn't allow concurrency
- library: model lock package for library (TODO: insert link)
Better solution: partial lock
- have multiple point of edition (can be same page)
- example: user edit page segmented into the following sections
- info ie names and coordinates
- addresses
- notifications
- system preferences
- lock by section instead locking the whole app
- pro: consistent, allow concurrency as long as it is not on the same section
- makes sens to lock partially