Add crate adapter that coalesces findRecord() requests

Author: Turbo87

app/adapters/crate.js

@@ -0,0 +1,15 @@
+import ApplicationAdapter from './application';
+
+const BULK_REQUEST_GROUP_SIZE = 10;
+
+export default class CrateAdapter extends ApplicationAdapter {
+  coalesceFindRequests = true;
+
+  groupRecordsForFindMany(store, snapshots) {
+    let result = [];
+    for (let i = 0; i < snapshots.length; i += BULK_REQUEST_GROUP_SIZE) {
+      result.push(snapshots.slice(i, i + BULK_REQUEST_GROUP_SIZE));
+    }
+    return result;
+  }
+}

tests/adapters/crate-test.js

@@ -0,0 +1,27 @@
+import { module, test } from 'qunit';
+
+import { setupMirage } from 'ember-cli-mirage/test-support';
+
+import { setupTest } from 'cargo/tests/helpers';
+
+module('Adapter | crate', function (hooks) {
+  setupTest(hooks);
+  setupMirage(hooks);
+
+  test('findRecord requests are coalesced', async function (assert) {
+    this.server.create('crate', { name: 'foo' });
+    this.server.create('version', { crateId: 'foo' });
+    this.server.create('crate', { name: 'bar' });
+    this.server.create('version', { crateId: 'bar' });
+
+    // if request coalescing works correctly, then this regular API endpoint
+    // should not be hit in this case
+    this.server.get('/api/v1/crates/:crate_name', {}, 500);
+
+    let store = this.owner.lookup('service:store');
+
+    let [foo, bar] = await Promise.all([store.findRecord('crate', 'foo'), store.findRecord('crate', 'bar')]);
+    assert.equal(foo?.name, 'foo');
+    assert.equal(bar?.name, 'bar');
+  });
+});