Explore: Fixed default data source loading (#37059) (#39379)

Co-authored-by: Andrej Ocenas <mr.ocenas@gmail.com>
(cherry picked from commit 64f898c5f6)

Co-authored-by: Assaf Dayan <asfdyn@gmail.com>

public/app/features/explore/ExploreToolbar.tsx

@@ -31,7 +31,7 @@ type Props = OwnProps & ConnectedProps<typeof connector>;
 
 export class UnConnectedExploreToolbar extends PureComponent<Props> {
   onChangeDatasource = async (dsSettings: DataSourceInstanceSettings) => {
-    this.props.changeDatasource(this.props.exploreId, dsSettings.name, { importQueries: true });
+    this.props.changeDatasource(this.props.exploreId, dsSettings.uid, { importQueries: true });
   };
 
   onClearAll = () => {

public/app/features/explore/state/datasource.ts

@@ -35,12 +35,12 @@ export const updateDatasourceInstanceAction = createAction<UpdateDatasourceInsta
  */
 export function changeDatasource(
   exploreId: ExploreId,
-  datasourceName: string,
+  datasourceUid: string,
   options?: { importQueries: boolean }
 ): ThunkResult<void> {
   return async (dispatch, getState) => {
     const orgId = getState().user.orgId;
-    const { history, instance } = await loadAndInitDatasource(orgId, datasourceName);
+    const { history, instance } = await loadAndInitDatasource(orgId, datasourceUid);
     const currentDataSourceInstance = getState().explore[exploreId]!.datasourceInstance;
 
     dispatch(

public/app/features/explore/state/utils.ts

@@ -60,11 +60,11 @@ export const createEmptyQueryResponse = (): PanelData => ({
 
 export async function loadAndInitDatasource(
   orgId: number,
-  datasourceName?: string
+  datasourceUid?: string
 ): Promise<{ history: HistoryItem[]; instance: DataSourceApi }> {
   let instance;
   try {
-    instance = await getDatasourceSrv().get(datasourceName);
+    instance = await getDatasourceSrv().get(datasourceUid);
   } catch (error) {
     // Falling back to the default data source in case the provided data source was not found.
     // It may happen if last used data source or the data source provided in the URL has been