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Story #18693

Updated by Peter Amstutz 8 months ago

It's confusing and potentially error prone to have multiple identical permission links, e.g. three link records all granting "can_read" going from the same user to the same project.    For example, there's 50 users with read access to a project, but one user is listed 3 times.    Someone goes it to remove that user's access, but only deletes one or two of the links, not all three. 

 Proposed change: 

 conflicting: permission link between the with same head/tail  

 or lower permission (e.g. adding a write permission conflicts with an existing read permission) 

 * "create" command 
 ** command: if there is a conflicting permission link and the existing link has lower permission, link, update the existing permission link and return that 
 ** if there is a conflicting permission link and the existing link has same or higher permission, do nothing and return the existing link 
 * "update" command 
 ** command: if a link is updated so it conflicts with another permission link, delete the other conflicting link 
 * "delete" command 
 ** command: delete doesn't change because there shouldn't be multiple conflicting links, but if there are, they should all get deleted links 
 * perform a data migration to remove any duplicated links 

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