Fix 817 (#851)

* problems: update panel schema

* update packages (build with node 12)

* problems: use datasource from target

* problems: fix query editor after schema update

* problems: fix list layout

* update circleci node image to 12

* fix tests

src/panel-triggers/migrations.ts

@@ -0,0 +1,90 @@
+import _ from 'lodash';
+import { getNextRefIdChar } from './utils';
+import { getDefaultTarget } from './triggers_panel_ctrl';
+
+// Actual schema version
+export const CURRENT_SCHEMA_VERSION = 7;
+
+export function migratePanelSchema(panel) {
+  if (isEmptyPanel(panel)) {
+    delete panel.targets;
+    return panel;
+  }
+
+  const schemaVersion = getSchemaVersion(panel);
+  panel.schemaVersion = CURRENT_SCHEMA_VERSION;
+
+  if (schemaVersion < 2) {
+    panel.datasources = [panel.datasource];
+    panel.targets = {};
+    panel.targets[panel.datasources[0]] = panel.triggers;
+
+    // delete old props
+    delete panel.triggers;
+    delete panel.datasource;
+  }
+
+  if (schemaVersion < 3) {
+    // delete old props
+    delete panel.lastChangeField;
+    delete panel.infoField;
+    delete panel.scroll;
+    delete panel.hideHostsInMaintenance;
+  }
+
+  if (schemaVersion < 5) {
+    if (panel.targets && !_.isEmpty(panel.targets)) {
+      _.each(panel.targets, (target) => {
+        _.defaultsDeep(target, getDefaultTarget());
+      });
+    }
+  }
+
+  if (schemaVersion < 6) {
+    if (panel.showEvents && panel.showEvents.value === '1') {
+      panel.showEvents.value = 1;
+    }
+  }
+
+  if (schemaVersion < 7) {
+    const updatedTargets = [];
+    for (const targetKey in panel.targets) {
+      const target = panel.targets[targetKey];
+      if (!isEmptyTarget(target) && !isInvalidTarget(target, targetKey)) {
+        updatedTargets.push({
+          ...target,
+          datasource: targetKey,
+        });
+      }
+    }
+    for (const target of updatedTargets) {
+      if (!target.refId) {
+        target.refId = getNextRefIdChar(updatedTargets);
+      }
+    }
+    panel.targets = updatedTargets;
+    delete panel.datasources;
+  }
+
+  return panel;
+}
+
+function getSchemaVersion(panel) {
+  return panel.schemaVersion || 1;
+}
+
+function isEmptyPanel(panel) {
+  return !panel.datasource && !panel.datasources && !panel.triggers && isEmptyTargets(panel.targets);
+}
+
+function isEmptyTargets(targets) {
+  return !targets || (_.isArray(targets) && (targets.length === 0 || targets.length === 1 && _.isEmpty(targets[0])));
+}
+
+function isEmptyTarget(target) {
+  return !target || !(target.group && target.host && target.application && target.trigger);
+}
+
+function isInvalidTarget(target, targetKey) {
+  return target && target.refId === 'A' && targetKey === '0';
+}