Bug report #14325: Order-By-Clause accumulates default sub-clauses - QGIS Application - QGIS Issue Tracking

Bug report #14325

Order-By-Clause accumulates default sub-clauses

Added by Sebastian Dietrich over 8 years ago. Updated over 6 years ago.

Status:	Closed
Priority:	Normal
Assignee:	Sebastian Dietrich
Category:	Symbology
Affected QGIS version:	master	Regression?:	No
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	Yes	Resolution:	fixed/implemented
Crashes QGIS or corrupts data:	No	Copied to github as #:	22313

Description

If a layer has only one attribute, the default sub-clause for the Control feature rendering order order-by-clause is added everytime

the Define order dialog is opened
the last sub-clause in that dialog loses focus

Reproduce:

Create a memory layer with a single attribute Attr
Open the Vector layer properties dialog
Open the Define order dialog
-> Note the default clause Attr ASC NULLS LAST is added automatically.
Click to set the focus to the text-edit containing Attr
Click anywhere else to take the focus away from it
-> The default clause is added again.
Close the dialog
Re-open the dialog
-> The default clause is added again.

Associated revisions

Revision 9dca6da0
Added by Nyall Dawson over 6 years ago

Don't silently discard requests to set QgsFieldExpressionWidget
to an empty expression

This causes issues in lots of places - e.g. a field constraint
is always set to the first field in a layer, and cannot be
removed.

I've looked at all calls to setField and without exception
they should accept that setting the field to an empty string
results in an empty expression.

Fixes #14325