[Qgis-user] Updating a field set with default global variable on edit

[Karl Magnus Jönsson]

Hi!
I've made the same things with triggers in the database. To avoid getting same username I've chosen not to save the username and password in the project. But then the user have to enter it every time the projects opens. If you can find a solution to your suggested approach it would be nice.

Karl-Magnus

Från: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] För McDonaldR
Skickat: den 22 augusti 2017 13:12
Till: qgis-user at lists.osgeo.org
Ämne: [Qgis-user] Updating a field set with default global variable on edit

Hi List,

Anyone know how to update a field that has a global variable set as the default value when records are edited (geometry and/or attributes)?

We have a QGIS project with a PostGIS layer loaded and configured with look-ups and relations so the users can update all the relevant fields. There are also "created_by" and "updated_by" fields. These are updated by a trigger in the database with the "current_user" database variable. This works fine if you are the current user that added the layer to the project - the trigger works perfectly.

If you give the project to someone else and they create and edit features in the layer the fields are still updated with your name as you are the person who added the layer to the project. Not what we want.

QGIS has global variables and there are some new ones - user_account_name and user_full_name that can be set as default values for the fields. When a new feature is created the field is populated with the correct name. Which is what we want.

However, when we update an existing record we'd like the "updated_by" field to be updated with the current "user_account_name". Like a trigger in the database would do on update. Then we would have a better idea of the history of the feature.

Ross

Ross McDonald | GIS Data Coordinator | Angus Council, People, IT | Angus House, Orchardbank Business Park, Sylvie Way, Forfar DD8 1AT | t: 01307 476419


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