[Qgis-developer] problem with ON INSERT TO ... DO INSTEAD postgres rules

[Matthias Kuhn]

Hi Luca,

this was a deliberate change to allow QGIS to directly use the newly
inserted features (e.g. add child records to a newly created feature).

To make the views compatible with this, all you need to do is add a

    RETURN NEW;

to the end of the insert function (I think). Have a look at the views
which I linked in my response in the other thread.

We could possibly add a flag to specify in which cases we need the new
primary key and in which cases not.
But I somehow suspect, that in the end we will need to specify this in
some often-used code (e.g. add feature form) and in the end one will
still be required to update all views and we have some half-baked
pointless workaround code inside QGIS.

Hope that helps for you!
Matthias

On 01/23/2017 04:19 PM, Luca Lanteri wrote:
> Hi to all,
> 
> after a short disscussion in qgis user list I've opened this ticket [0],
> because starting from QGIS 2.16 I can't insert new feature in postgres
> views using rules. When I try to insert a new feature I have this error
> [1]. All works fine with QGIS 2.14. The problem happens only with INSERT
> rules. UPDATE and DELETE are ok.
> 
> I saw that for simple rules I can add a RETURNING * clause and all works
> fine, but I have a lot of complex view that use many tables, so
> RETURNING * clause doesn't work and compose the clause it's really hard.
> 
> Then I have some question:
> 1) Is it really an issue or the problem is due to a new functionality of
> QGIS ?
> 2) In the first case, it could be considered a regression for it works
> on QGIS 2.14 ?
> 3) Is there a simple way to modify my views by adding a RETURNING clause
> without specify all returning field (* doesn't work) ?
> 
> I love to know if it's a deliberate change or it's just a bug,so I can
> choose if I have to modify all my views, in order to allow me to migrate
> to QGIS 2.18.
> 
> Many thanks in advance
> Regards
> Luca
> 
> 
> [0] https://hub.qgis.org/issues/16083
> 
> [1] Impossibile applicare le modifiche al vettore v_frane_pol_full
> 
> Errori: ERRORE: 1 geometria non aggiunta.
> Errori della sorgente dati:
> Errore PostGIS nell'aggiunta delle geometrie: ERROR: cannot perform
> INSERT RETURNING on relation "v_frane_pol_full" 
> 
> HINT: You need an unconditional ON INSERT DO INSTEAD rule with a
> RETURNING clause. 
> 
> 
> 
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