[GRASS-dev] Re: [GRASS GIS] #831: v.category options sum, del, and add do nothing

[GRASS GIS]

#831: v.category options sum, del, and add do nothing
--------------------------+-------------------------------------------------
  Reporter:  isaacullah   |       Owner:  martinl         
      Type:  enhancement  |      Status:  new             
  Priority:  major        |   Milestone:  7.0.0           
 Component:  Vector       |     Version:  svn-develbranch6
Resolution:               |    Keywords:  v.category      
  Platform:  All          |         Cpu:  All             
--------------------------+-------------------------------------------------
Comment (by cmbarton):

 v.to.db won't work for this. If a cat value was originally 3 and has been
 changed to 5, the link with the corresponding attribute record will be
 lost, because the attribute record still has cat=3. With this link gone,
 there is no way for v.to.db to know which is the correct record to upload
 the new cat value to. Example with new cat numbers incremented by 2 using
 v.category (this needs to be seen in the bug tracker for the formatting to
 make any sense).

 ----
 'monospace'
 {{{

 OLD         NEW

 vect  db    vect  db
 1-----1     2--\   1
 2-----2     4-\ \--2
 3-----3     6  \   3
 4-----4     8   \--4


 }}}

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Ticket URL: <http://trac.osgeo.org/grass/ticket/831#comment:7>
GRASS GIS <http://grass.osgeo.org>