Publishing a layer as WFS with PyQGIS

Question

Using QGIS 3.4 I am currently creating new and also cloning vector layers with postgres datasource in an existing project using PyQGIS. This works OK but I need to publish these layers and enable update, insert and delete. In other words, do the equivalent of going to Project Properties - QGIS Server, and then check checkboxes for "Published", "Update", "Insert" and "Delete" (in QGIS client software).

Is this possible using PyQGIS?

Answer 1

It's possible to set the configuration from PyQGIS although it has been a bit annoying to look at the C code to find the keys to write in the QGIS project file (https://github.com/qgis/QGIS/blob/9a0a1297c2e585cdbc3dbeeb64f5792024a451f9/src/app/qgsprojectproperties.cpp#L1479)

You can find below a recipe. After running it, you will be able to see if it works fine by opening the "Project properties | QGIS Server" panel

Limit of the recipe: we didn't try to catch error when the layer name in the config does not match the layers in the QGIS project

vectorLayers = {layer.id(): layer.name() for layer in QgsProject.instance().mapLayers().values() if isinstance(layer, QgsVectorLayer)}

wfsLayersConfig = [
  {
    "name": "your layer name 1",
    "published": True,
    "precision": 8,
    "Update": True,
    "Insert": False,
    "Delete": True
   },
   {
    "name": "your layer name 2",
    "published": False,
    "precision": 8,
    "Update": False,
    "Insert": True,
    "Delete": False
   }
]

# To join by name as a key instead of identifier
# Weak but to be generic, more simple to use layer name
# whereas layers identifiers hidden
vectorLayersKeyValReversed = {v: k for k, v in vectorLayers.items()}
# To set if published
QgsProject.instance().writeEntry( "WFSLayers" , "/", [vectorLayersKeyValReversed[l['name']] for l in wfsLayersConfig if l["published"]]);
# Set precision (need to loop as the xml tag is the layer identifier)
[QgsProject.instance().writeEntry("WFSLayersPrecision", "/" + vectorLayersKeyValReversed[l['name']], l["precision"]) for l in wfsLayersConfig]
# Set Update
QgsProject.instance().writeEntry( "WFSTLayers" , "Update", [vectorLayersKeyValReversed[l['name']] for l in wfsLayersConfig if l["Update"]]);
# Set Insert
QgsProject.instance().writeEntry( "WFSTLayers" , "Insert", [vectorLayersKeyValReversed[l['name']] for l in wfsLayersConfig if l["Insert"]]);
# Set Delete
QgsProject.instance().writeEntry( "WFSTLayers" , "Delete", [vectorLayersKeyValReversed[l['name']] for l in wfsLayersConfig if l["Delete"]]);

QgsProject.instance().write()