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[Robert Lyon <robertl@xxxxxxxxxxxxxxx>]

** Changed in: mahara
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1774103

Title:
  Combine all the *_tag tables into one table

Status in Mahara:
  Fix Released

Bug description:
  Currently we have

  - artefact_tag
  - collection_tag
  - view_tag
  - usr_tag

  tables and if we want to have new tagging, say for groups we would
  need to add another table

  It might be easier to combine all these tables so that we can do
  easier queries, like what are all the tags for an owner. Rather than
  having to do a bunch of table joins and checking what things are owned
  by what view/artefact etc we can just query the one table.

  I'm thinking of having one table with the fields

   id, tag, resourcetype, resourceid, ownertype, ownerid, editedby,
  ctime, mtime

  where resourcetype is either 'view', 'artefact' etc
  and resourceid is the id of that type

  Where ownertype can be 'user', 'group', institution'
  and ownerid can be the id number or shortname

  And editedby can be the ID of the current user interacting with the
  tag - useful for group/institution tags

  ctime = created time
  mtime = modified time

  This is to support a number of new tag features for Mahara 18.10.

  Sponsored by PHBern.

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