Adds a migration to remove _id from filter items

app/api/migrations/migrations/34-remove-_id-from-filter-items/index.js

@@ -0,0 +1,24 @@
+export default {
+  delta: 34,
+
+  name: 'remove-_id-from-filter-items',
+
+  description: 'Removed _id from filter items in settings',
+
+  async up(db) {
+    process.stdout.write(`${this.name}...\r\n`);
+    await db.collection('settings').updateMany(
+      {
+        filters: {
+          $exists: true,
+          $ne: [],
+          $elemMatch: {
+            items: { $exists: true },
+          },
+        },
+      },
+      { $unset: { 'filters.$[].items.$[]._id': 1 } },
+      { multi: true }
+    );
+  },
+};

app/api/migrations/migrations/34-remove-_id-from-filter-items/specs/34-remove-_id-from-filter-items.spec.js

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+import testingDB from 'api/utils/testing_db';
+import migration from '../index.js';
+import fixtures from './fixtures.js';
+
+describe('migration remove-_id-from-filter-items', () => {
+  beforeEach(async () => {
+    spyOn(process.stdout, 'write');
+    await testingDB.clearAllAndLoad(fixtures);
+  });
+
+  afterAll(async () => {
+    await testingDB.disconnect();
+  });
+
+  it('should have a delta number', () => {
+    expect(migration.delta).toBe(34);
+  });
+
+  it('should remove _id field from filter items', async () => {
+    await migration.up(testingDB.mongodb);
+    const settings = await testingDB.mongodb
+      .collection('settings')
+      .find({})
+      .toArray();
+
+    const [item1, item2, item3] = settings[0].filters[0].items;
+    expect(item1).not.toHaveProperty('_id');
+    expect(item2).not.toHaveProperty('_id');
+    expect(item3).not.toHaveProperty('_id');
+  });
+});

app/api/migrations/migrations/34-remove-_id-from-filter-items/specs/fixtures.js

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+export default {
+  settings: [
+    {
+      filters: [
+        {
+          items: [
+            {
+              _id: 'id1',
+            },
+            {
+              _id: 'id2',
+            },
+            {
+              _id: 'id3',
+            },
+          ],
+        },
+      ],
+    },
+  ],
+};