Improve compatibility with GeoNode 3.3.1 (GeoNode#209)

Improve compatibility with GeoNode 3.3.1

Also fix metadata download error that was being caused by the api client object being deleted

fixes GeoNode#210
fixes GeoNode#199

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
   ci:
     runs-on: ubuntu-20.04
     container:
-      image: qgis/qgis:release-3_16
+      image: qgis/qgis:release-3_18
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
@@ -46,7 +46,7 @@ jobs:
     if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-20.04
     container:
-      image: qgis/qgis:release-3_16
+      image: qgis/qgis:release-3_18
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

.github/workflows/rebuild-docs.yml

@@ -6,7 +6,7 @@ jobs:
   rebuild-docs:
     runs-on: ubuntu-20.04
     container:
-      image: qgis/qgis:release-3_16
+      image: qgis/qgis:release-3_18
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

.github/workflows/release.yml

@@ -8,7 +8,7 @@ jobs:
   create-release:
     runs-on: ubuntu-20.04
     container:
-      image: qgis/qgis:release-3_16
+      image: qgis/qgis:release-3_18
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
@@ -62,7 +62,7 @@ jobs:
     needs: create-release
     runs-on: ubuntu-20.04
     container:
-      image: qgis/qgis:release-3_16
+      image: qgis/qgis:release-3_18
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

src/qgis_geonode/apiclient/base.py

@@ -115,21 +115,22 @@ def handle_dataset_style(
         raise NotImplementedError
 
     def get_dataset_detail(
-        self, brief_dataset: models.BriefDataset, get_style_too: bool = False
+        self,
+        dataset: typing.Union[models.BriefDataset, models.Dataset],
+        get_style_too: bool = False,
     ) -> None:
         requests_to_perform = [
-            network.RequestToPerform(url=self.get_dataset_detail_url(brief_dataset.pk))
+            network.RequestToPerform(url=self.get_dataset_detail_url(dataset.pk))
         ]
         if get_style_too:
             is_vector = (
-                brief_dataset.dataset_sub_type
-                == models.GeonodeResourceType.VECTOR_LAYER
+                dataset.dataset_sub_type == models.GeonodeResourceType.VECTOR_LAYER
             )
             should_load_vector_style = (
                 models.ApiClientCapability.LOAD_VECTOR_LAYER_STYLE in self.capabilities
             )
             if is_vector and should_load_vector_style:
-                sld_url = QtCore.QUrl(brief_dataset.default_style.sld_url)
+                sld_url = QtCore.QUrl(dataset.default_style.sld_url)
                 requests_to_perform.append(network.RequestToPerform(url=sld_url))
 
         self.network_fetcher_task = network.NetworkRequestTask(