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I have a layer in QGIS loaded from a postgis database. In the layer properties dialog in QGIS, under the fields tab, layers with a typename of 'bool' (which are boolean fields in the postgis database) appear as type 'QString'. The values then behave as strings in QGIS. Is there a way to bring the layer in so that the boolean fields are treated as booleans in QGIS?

2

I solved my problem with the following approach:

In the field which holds the boolean value, I defined a checkbox as edit widget under layer properties -> fieöds and set the representation for checked as t and for unchecked as f ( see image) enter image description here

Another but similar approach is to use a value map field and use the two options (image 2)

enter image description here

I then defined a standard layer style for my layer in QGIS and saved this style into the database with properties -> style(the button down left) -> Save as default -> Save to datasource database

So every time I load the layer the bool field is shown as checkbox which is either t or f and which is understood by Postgres as a boolean value and if I query the field inside postgres with:

SELECT bool_field from my_table 

I get something like

bool_field: false, false. true, ...

0

I think it's impossible. But you can use the field like a boolean with the selection box (ex: myfield = 't' ). Result will be same as myfield is true in Postgresql.

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