Bug report #16948: "Paste features as..." always creates vector layer/scratch layer that can only handle just singlepart features, so pasting multipart features always returns an error - QGIS Application - QGIS Issue Tracking

Bug report #16948

"Paste features as..." always creates vector layer/scratch layer that can only handle just singlepart features, so pasting multipart features always returns an error

Added by Giovanni Manghi over 6 years ago. Updated over 6 years ago.

Status:	Closed
Priority:	High
Assignee:	Luigi Pirelli
Category:	Vectors
Affected QGIS version:	2.18.13	Regression?:	Yes
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	Yes	Resolution:	fixed/implemented
Crashes QGIS or corrupts data:	No	Copied to github as #:	24847

Description

Unlike the

Layer > create layer > new temporary scratch layer

dialog that allow the user choose if the supported geometries are multi or not, the

Paste features as...

dialog do not allow choose that, it turns that is the copied features are multi then an error in thrown... but not in the message bar as eventually expected, just in the log:

2017-08-01T14:01:14 1 Commit errors:
ERROR: 99 feature(s) not added - geometry type is not compatible with the current layer.
SUCCESS: 6 attribute(s) added.
2017-08-01T17:39:22 1 Commit errors:
ERROR: 62 feature(s) not added - geometry type is not compatible with the current layer.
SUCCESS: 6 attribute(s) added.

and the scratch layer does not even show in the layer list.

2.18.11_paste_feature_as_in_temporary_layer_ok.pdf (223 KB) Gerhard Spieles, 2017-08-01 09:20 PM

cn36201_caop_utm_wg84.dxf (1.66 MB) Giovanni Manghi, 2017-08-03 12:05 AM

Related issues

History

#1 Updated by Gerhard Spieles over 6 years ago

File 2.18.11_paste_feature_as_in_temporary_layer_ok.pdf added

Here no problem in 2.18.11 under win10
pdf is attached

#2 Updated by Nyall Dawson over 6 years ago

Status changed from Open to Feedback

Giovanni - do you think we should just force the scratch layer to always be multitype here?

#3 Updated by Jürgen Fischer over 6 years ago

Related to Bug report #16770: copy/paste/save features from one layer to another of the same time broke in 2.18 added

#4 Updated by Giovanni Manghi over 6 years ago

Regression? changed from No to Yes
File cn36201_caop_utm_wg84.dxf added
Status changed from Feedback to Open
Priority changed from Normal to High

Nyall Dawson wrote:

Giovanni - do you think we should just force the scratch layer to always be multitype here?

yes, possibly. Please note that this was working as expected in 2.14. The test can be done with the attached dxf, from where to copy the features.

#5 Updated by Luigi Pirelli over 6 years ago

something managed (convert to multi) in some provider or wkb cases:
https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp#L8021

#6 Updated by Gregor Sanders over 6 years ago

I'm trying to paste 98 polygons (some will be multipart) into a temporary scratch layer and they paste successfully, but I cannot save (QGIS v 2.18.12):

Errors: ERROR: 98 feature(s) not added - geometry type is not compatible with the current layer.

Giovanni wrote:

Nyall Dawson wrote:

Giovanni - do you think we should just force the scratch layer to always be multitype here?

yes, possibly. Please note that this was working as expected in 2.14. The test can be done with the attached dxf, from where to copy the features.

Note: In my case, the scratch layer was created as a multipolygon type layer, so maybe the problem is due to mixing single part and multipart polygons when pasting?

#7 Updated by Luigi Pirelli over 6 years ago

#8 Updated by Luigi Pirelli over 6 years ago

Hi Gregor,

what is the target format on which you want to save the scratch layer?

Gregor Sanders wrote:

I'm trying to paste 98 polygons (some will be multipart) into a temporary scratch layer and they paste successfully, but I cannot save (QGIS v 2.18.12):

Errors: ERROR: 98 feature(s) not added - geometry type is not compatible with the current layer.

Giovanni wrote:

Nyall Dawson wrote:

Giovanni - do you think we should just force the scratch layer to always be multitype here?

yes, possibly. Please note that this was working as expected in 2.14. The test can be done with the attached dxf, from where to copy the features.

Note: In my case, the scratch layer was created as a multipolygon type layer, so maybe the problem is due to mixing single part and multipart polygons when pasting?

#9 Updated by Luigi Pirelli over 6 years ago

Assignee set to Luigi Pirelli

probably just adding a GUI to ask destination type (e.g. force to multy)
https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp#L8068

tha actual code that create scratch layer force to Multi in there is at least a feature multi inside the features to paste. I would leave the decision to convert to multy to the user

#10 Updated by Luigi Pirelli over 6 years ago

We should divide the problem in two aspects:

1) create a scratch layer asking the user to force
2) notify as soon as possible the user that paste is not compatible trying to avoid to wait to commitChanges to raise the exception.

#11 Updated by Luigi Pirelli over 6 years ago

I can't (almost) rplicate the issue with 2.18 36e6bd1

"almost" because, coping from a MultiLineString layer with real multi lines and choosing "automatic" in the "PasteAs" interface give the following results:
1) Memory layer => generate MultiLineString
2) Shapefile => generate LineString (but the multi line is accepted and present in the layer :/ )
3) Spatialite => generate MultiLineString

Probably Shapefile works (ogr) because it doen't do any strict geometry check

so, IMHO this issue can be closed, or I don't understand where is the issue.

@giovanni any opinion?

#12 Updated by Giovanni Manghi over 6 years ago

Affected QGIS version changed from 2.18.11 to 2.18.13

Luigi Pirelli wrote:

I can't (almost) rplicate the issue with 2.18 36e6bd1

"almost" because, coping from a MultiLineString layer with real multi lines and choosing "automatic" in the "PasteAs" interface give the following results:
1) Memory layer => generate MultiLineString
2) Shapefile => generate LineString (but the multi line is accepted and present in the layer :/ )
3) Spatialite => generate MultiLineString

Probably Shapefile works (ogr) because it doen't do any strict geometry check

so, IMHO this issue can be closed, or I don't understand where is the issue.

@giovanni any opinion?

On 2.18.13 the behavior is still the same (wrong/error, works in 2.14):

2017-09-21T10:12:27 1 Commit errors:
ERROR: 418 feature(s) not added - geometry type is not compatible with the current layer.
SUCCESS: 6 attribute(s) added.

To replicate do exactly what in the description and with attached data.

#13 Updated by Luigi Pirelli over 6 years ago

confirmed following these steps
1) load attached dx: LineString layer
2) selct all features
3) past as new scratch layer => error in General log message. No message to the user via GUI

#14 Updated by Luigi Pirelli over 6 years ago

The PR: https://github.com/qgis/QGIS/pull/5223
seems solving the issue, please confirm

#15 Updated by Luigi Pirelli over 6 years ago

IMHO the patch does not solve the origin of the proble.... the LineString dxf layer is a LineStringZ
Any Z or M layer is Flat during paste:
https://github.com/qgis/QGIS/blob/release-2_18/src/app/qgisapp.cpp#L7625
I suppose because when new geometry engine was introduced it was necessary to avoid regressions.

#16 Updated by Luigi Pirelli over 6 years ago

IMHO any changes to accept Z or M layers have to be applied only in 3.x version

#17 Updated by Giovanni Manghi over 6 years ago