[Qgis-user] Saving a polygon in QGis before to edit it

[Enrico Ferreguti]

It's difficult to realize what happens from your description. The plugin is
very simple, it saves all buffer and restores them checking data consistency,
so the issues you report makes me think it could happen a featureId
mismatch.  Perhaps you are trying to restore a version on a already
modified layer. Did you get some messages loading version file? Is it the
same with non PostGis Layers?
The plugin has been marked as experimental because it's not wide tested and
I fear it could bring to data losses, so I ask you to contribute reporting
the bug to the issue tracker (
https://github.com/enricofer/layerVersion/issues), providing all the
informations (operational steps, sample datasets) needed to replicate the
issue.
Thanks.



2015-07-20 14:39 GMT+02:00 didier peeters <dpeeter1 at ulb.ac.be>:

> I’m facing a strange behavior now: I tested the layerVersion plugin, at
> first it seemed to work fine and effectively bring back the previous
> polygon’s shape.
> But then a confusion appeared  between the polygons : when moved one, it
> would ‘disappear’ and another would move as well and after saving this only
> the second polygon had moved while the first one would ‘re-appear’ at its
> original place.  When selecting a polygon, 2 more ones are selected as
> well, and when deleting ‘them’ (with the red garbage can, I use QGis 2.8.2)
> the first one disappears only.  This behavior continues after having
> uninstalled LayerVersion and restarted QGis.
>
> Is this a bug generated by LayerVersion ?  Has anybody seen this before ?
> My layer is provided by PostGis.
>
>
> Didier
>
>
> Le 20 juil. 2015 à 13:24, Enrico Ferreguti <enricofer at gmail.com> a écrit :
>
> mmm... sorry, debug infos left in the code....
> simply remove line 142 (the last) of file "/Users/didier/.qgis2/python/
> plugins/layerVersion/layerversion.py"
> with a text editor and reload the plugin.
>
> Regards.
> Enrico
>
> 2015-07-20 13:05 GMT+02:00 Matthias Kuhn <matthias at opengis.ch>:
>
>>  Hi,
>>
>> I remember geogig (formerly geogit) offers promising concepts for
>> filebased spatial data management with historization and branching.
>> Unfortunately I don't know the current status of the project and the
>> progress of integration in QGIS.
>>
>> Matthias
>>
>>
>> On 07/20/2015 11:25 AM, Neumann, Andreas wrote:
>>
>> Hi Didier,
>>
>> I don't think that anyone is working on a client-side historisation
>> option in QGIS. And there wasn't much demand for that in the past, since
>> most serious GIS data resides in databases.
>>
>> Andreas
>>
>> On 2015-07-20 09:45, didier peeters wrote:
>>
>> Hello Andreas,
>>
>> yes it's for some 'historisation', more precisely to make a filiation,
>> and yes I certainly will use triggers in PostGIS.  But I wanted to avoid
>> confusion between different kind of edition operations that I'm not
>> currently foreseeing; I'm not sure it will always be easy to distinct this
>> specific action from others.  And I thought that it might also be
>> interesting outside of the database world, to have that "edit and preserve"
>> operation.
>>
>>    Didier
>>
>>  Le 20 juil. 2015 à 09:10, Neumann, Andreas <a.neumann at carto.net> a
>> écrit :
>>
>> Hi Didier,
>>
>> Is this for historisation purposes? If yes, I would look into database
>> solutions to do historization.
>>
>> The SQL-MM standard has this as a built-in tool set for databases,
>> however, PostgreSQL does not implement this part of the SQL specification
>> (I believe the latest versions of SQL server and Oracle 12 does). However,
>> you can simulate the same in Postgis, using triggers and rules.
>>
>> Andreas
>>
>> On 2015-07-20 08:00, didier peeters wrote:
>>
>> Hello,
>>
>> I would like to find the best solution to the following case:
>>
>> in QGis, when editing a polygon (splitting it in 2 parts) I need to save
>> the original shape, in order to keep the different steps of its evolution;
>> this operation is likely to be repeated several times.  The solution I
>> found is to
>>
>>    - start by copying the polygon,
>>    - then edit it (split)
>>    - then pasting back the original one,
>>    - then adjust and update the attributes of the 2 new polygons.
>>
>>
>>  Is there a less tricky way to achieve this ?
>>
>> If not it would be nice to have an option in the save dialog (with a
>> default behaviour set in the Settings), and I would file a feature request.
>>
>>
>> Didier
>>
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