finish up fix

addon/-legacy-private/system/model/model.js

@@ -1,7 +1,7 @@
 import ComputedProperty from '@ember/object/computed';
 import { isNone } from '@ember/utils';
 import EmberError from '@ember/error';
-import run from '@ember/runloop';
+import { run } from '@ember/runloop';
 import Evented from '@ember/object/evented';
 import EmberObject, { computed, get } from '@ember/object';
 import Map from '../map';

addon/-legacy-private/system/model/states.js

@@ -699,6 +699,8 @@ const RootState = {
         internalModel.triggerLater('didCommit', internalModel);
       },
 
+      // TODO @runspired should we special case unloadRecord for root.deleted.saved ?
+
       willCommit() {},
       didCommit() {},
       pushedData() {},

addon/-record-data-private/system/model/model.js

@@ -3,6 +3,7 @@ import { isNone } from '@ember/utils';
 import EmberError from '@ember/error';
 import Evented from '@ember/object/evented';
 import EmberObject, { computed, get } from '@ember/object';
+import { run } from '@ember/runloop';
 import Map from '../map';
 import { DEBUG } from '@glimmer/env';
 import { assert, warn } from '@ember/debug';
@@ -616,7 +617,10 @@ const Model = EmberObject.extend(Evented, {
   destroyRecord(options) {
     this.deleteRecord();
     return this.save(options).then(() => {
-      this.unloadRecord();
+      // the nested runloop here is necessary to ensure that the record is fully
+      //   destroyed prior to the promise resolving.
+      //   run.join is inadequate as the destroy queue would still be flushed after the resolve
+      run(() => this.unloadRecord());
     });
   },
 

addon/-record-data-private/system/model/states.js

@@ -697,6 +697,8 @@ const RootState = {
         internalModel.triggerLater('didCommit', internalModel);
       },
 
+      // TODO @runspired should we special case unloadRecord for root.deleted.saved ?
+
       willCommit() {},
       didCommit() {},
       pushedData() {},

tests/integration/records/delete-record-test.js

@@ -252,16 +252,17 @@ module('integration/deletedRecord - Deleting Records', function(hooks) {
     );
     assert.equal(get(store.peekAll('person'), 'length'), 1, 'The new person should be in the store');
 
-    record.deleteRecord();
+    let internalModel = record._internalModel;
+
+    await record.destroyRecord();
 
-    assert.equal(get(record, 'currentState.stateName'), 'root.deleted.saved', 'We reached the correct persisted saved state');
+    assert.equal(internalModel.currentState.stateName, 'root.deleted.saved', 'We reached the correct persisted saved state');
     assert.equal(
       get(store.peekAll('person'), 'length'),
       0,
       'The new person should be removed from the store'
     );
 
-    let internalModel = record._internalModel;
     let cache = store._identityMap._map.person._models;
     assert.todo.ok(cache.indexOf(internalModel) === -1, 'The internal model is removed from the cache');
     assert.todo.equal(internalModel.isDestroying, true, 'The internal model is destroyed');
@@ -300,18 +301,19 @@ module('integration/deletedRecord - Deleting Records', function(hooks) {
       'records should start in the created.invalid state'
     );
     assert.equal(get(store.peekAll('person'), 'length'), 1, 'The new person should be in the store');
+    let internalModel = record._internalModel;
 
     await record.destroyRecord();
 
-    assert.equal(get(record, 'currentState.stateName'), 'root.deleted.saved', 'We reached the correct persisted saved state');
-    debugger;
+    // it is uncertain that `root.empty` vs `root.deleted.saved` afterwards is correct
+    //   but this is the expected result of `unloadRecord`. We may want a `root.deleted.saved.unloaded` state?
+    assert.equal(internalModel.currentState.stateName, 'root.empty', 'We reached the correct persisted saved state');
     assert.equal(
       get(store.peekAll('person'), 'length'),
       0,
       'The new person should be removed from the store'
     );
 
-    let internalModel = record._internalModel;
     let cache = store._identityMap._map.person._models;
 
     assert.ok(cache.indexOf(internalModel) === -1, 'The internal model is removed from the cache');