[QGIS-trac] [Quantum GIS] #3770: Cannot add parts to multipoint or multilinestring feature

[Quantum GIS]

#3770: Cannot add parts to multipoint or multilinestring feature
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   Reporter:  mayeulk           |              Owner:               
       Type:  bug               |             Status:  new          
   Priority:  minor: annoyance  |          Milestone:  Version 1.7.0
  Component:  Vectors           |            Version:               
   Keywords:                    |   Platform_version:               
   Platform:  All               |           Must_fix:  No           
Status_info:  0                 |  
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 Not all buttons in the advance editing toolbar are available for
 all geometry types: you cannot add parts to multipoint or multilinestring
 feature, but can with multipolygons.
 Tested with r 15754 and postgis as a backend:

 * You cannot add a point to a multipoint feature (you can only add a new
 feature). You can move or delete one of its parts . You can copy a
 multipoint feature and paste it as a new multipoint feature.

 * You cannot add a part to a multiline string (you can only add a new
 feature). You can move or delete one of its parts. You can copy a
 multiline feature and paste it as a new multiline feature.

 * You can add and delete parts to multipolygon. (As a minor note, to
 delete a part of a multipolygon. you have to click on one of its
 vertice, which *might* be a problem if you have a set of contiguous
 (parts of) polygons).

 As a side point, note that it is the responsibility of the backend to
 generate new id's when copy/pasting to avoid duplicates, e.g. with:
 ALTER TABLE test_multipoints
   ADD CONSTRAINT test_multipoints_pkey PRIMARY KEY(id);
 otherwise duplicated id's are created (which does not prevent most
 functions to work apparently).

 I consider this as an annoyance more than a major bug because you can
 always create more features and duplicate the attributes, potentially with
 a field like relation_id (the OSM way from a conceptual point of view). If
 two points belong to the same relation (should be a multipoint), then they
 have the same relation_id. Still, if you already have a database with
 multi* geometries and *must* keep this structure, fixing this bug will
 help.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3770>
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