Resolve Ember Data deprecation, much like this PR did: miragejs#2444

But instead apply to master

Author: kiwi-josh

packages/ember-cli-mirage/addon/ember-data.js

@@ -3,7 +3,11 @@
 import require from 'require';
 import config from 'ember-get-config';
 import assert from './assert';
-import { hasEmberData, isDsModel } from 'ember-cli-mirage/utils/ember-data';
+import {
+  hasEmberData,
+  isDsModel,
+  AppSymbolForEmberDataModels,
+} from 'ember-cli-mirage/utils/ember-data';
 import { Model, belongsTo, hasMany } from 'miragejs';
 import EmberDataSerializer from 'ember-cli-mirage/serializers/ember-data-serializer';
 import { _utilsInflectorCamelize as camelize } from 'miragejs';
@@ -14,6 +18,19 @@ const { modulePrefix, podModulePrefix } = config;
 let DsModels, Models;
 let DsSerializers, Serializers;
 
+function _getAppInstance() {
+  const application = window[AppSymbolForEmberDataModels];
+  let appInstance = application.__deprecatedInstance__;
+  // If an appInstance wasn't found (such as when running the tests)
+  // then instantiate one manually, so we can use it to discover the
+  // ember-data models in a way that doesn't trigger deprecations.
+  if (!appInstance) {
+    application._buildDeprecatedInstance();
+    appInstance = application.__deprecatedInstance__;
+  }
+  return appInstance;
+}
+
 /**
  * Get all ember data models under the app's namespaces
  *
@@ -45,8 +62,19 @@ export function getDsModels() {
       path.match(classicModelMatchRegex) || path.match(podModelMatchRegex);
     if (matches && matches[1]) {
       let modelName = matches[1];
+      let model = undefined;
+
+      // Use the appInstance to lookup the models if provided, to avoid triggering
+      // the ember-data:deprecate-early-static deprecation in ember-data
+      const appInstance = _getAppInstance();
+      if (appInstance) {
+        const modelNameExact = path.split('/models/')[1];
+        const store = appInstance.lookup('service:store');
+        model = store.modelFor(modelNameExact);
+      } else {
+        model = require(path, null, null, true).default;
+      }
 
-      let model = require(path, null, null, true).default;
       if (isDsModel(model)) {
         DsModels[modelName] = model;
       }

packages/ember-cli-mirage/addon/utils/ember-data.js

@@ -11,3 +11,10 @@ export const hasEmberData = dependencySatisfies('ember-data', '*');
 export function isDsModel(m) {
   return m && typeof m.eachRelationship === 'function';
 }
+
+/**
+  @hide
+*/
+export const AppSymbolForEmberDataModels = Symbol(
+  'AppSymbolForEmberDataModels'
+);

packages/ember-cli-mirage/app/initializers/ember-cli-mirage.js

@@ -2,7 +2,9 @@ import ENV from '../config/environment';
 import getRfc232TestContext from 'ember-cli-mirage/get-rfc232-test-context';
 import startMirageImpl from 'ember-cli-mirage/start-mirage';
 import * as config from '../mirage/config';
-const { default: makeServer } = config;
+import { AppSymbolForEmberDataModels } from 'ember-cli-mirage/utils/ember-data';
+
+const { default: makeServer, baseConfig, testConfig } = config;
 
 //
 // This initializer does two things:
@@ -16,6 +18,18 @@ const { default: makeServer } = config;
 export default {
   name: 'ember-cli-mirage',
   initialize(application) {
+    window[AppSymbolForEmberDataModels] = application;
+
+    if (baseConfig) {
+      application.register('mirage:base-config', baseConfig, {
+        instantiate: false,
+      });
+    }
+    if (testConfig) {
+      application.register('mirage:test-config', testConfig, {
+        instantiate: false,
+      });
+    }
     if (makeServer) {
       application.register('mirage:make-server', makeServer, {
         instantiate: false,