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Collection version history » History » Revision 6

Revision 5 (Peter Amstutz, 07/11/2018 04:02 PM) → Revision 6/17 (Peter Amstutz, 07/11/2018 04:28 PM)

h1. Collection version history 

 (draft) 

 Background: desired API features (see #13109, #13494, #13561) #13494) 
 * Get current + previous versions of a collection with a single API call 
 * Search all current + previous versions of collections with a single API call 
 * Stable small numeric "version number" for each version of a given collection 

 Implementation 
 * Store all versions in the collection table (much easier to do paging) 
 * New database column indicates current version's UUID 
 * New database column indicates user-friendly version number (starting at 1) -- can be assigned safely after locking "current" row for update 
 * Assign version number to the current version -- this way {uuid,version} can be used as a permanent reference to a specific version 
 * Flag "include_past_versions" for "list" API to include old versions (otherwise, filter on current_version_uuid=uuid -- might need to adjust indexes to maintain performance) 
 * Flag in site configuration to enable preserving old versions in database 
 * Update owner_uuid of all old versions when it changes in the current version 
 * A permission link to the current version implies permission to its entire history 
 * Prohibit permission links to old versions (should be handled by check "can only make links to things that are visible to you", and not including old versions) 
 * Old versions may not be modified except for certain fields which must be synchronized with "current" version changes (owner_uuid, trash_at, delete_at), updating owner_uuid, trash_at, delete_at does not update modified_at (???) so modified_at shows when the version was created 
 * Old versions with duplicate "name" does not conflict with (owner_uuid, name) uniqueness constraint 
 * The following changes introduce a new version: manifest_text, description (??), properties (??)