Add Mongoose + DocumentDB playground

documentdb-playground/mongoose/app/.dockerignore

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+node_modules
+npm-debug.log
+.env
+mongoose-crud-test.js

documentdb-playground/mongoose/app/Dockerfile

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+# Mongoose + Express demo for DocumentDB.
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install dependencies first for better layer caching.
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+# Copy application source.
+COPY db.js server.js ./
+COPY models ./models
+
+# Run as the built-in non-root user.
+USER node
+
+ENV PORT=3000
+EXPOSE 3000
+
+CMD ["node", "server.js"]

documentdb-playground/mongoose/app/db.js

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+'use strict';
+
+const mongoose = require('mongoose');
+
+/**
+ * Build the Mongoose connection options that DocumentDB's gateway requires.
+ *
+ * DocumentDB exposes a single gateway endpoint that speaks the MongoDB wire
+ * protocol but advertises itself as a standalone server (not a replica set).
+ * Mongoose / the Node driver therefore needs:
+ *
+ *   - directConnection: true        -> don't attempt replica-set topology
+ *                                      discovery (the gateway is standalone).
+ *   - tls: true                     -> the gateway only accepts TLS.
+ *   - tlsAllowInvalidCertificates   -> the default install uses a self-signed
+ *                                      cert. Set TLS_INSECURE=false and mount a
+ *                                      CA bundle for production-grade verification.
+ *
+ * The connection string itself (MONGO_URI) carries the credentials. If it still
+ * contains `replicaSet=rs0`, strip it here so the driver does not try to match a
+ * replica-set name the gateway never advertises.
+ */
+function sanitizeUri(uri) {
+  if (!uri) {
+    throw new Error('MONGO_URI is not set. Provide a DocumentDB connection string.');
+  }
+  // Remove replicaSet=... (incompatible with directConnection against the gateway).
+  return uri.replace(/([?&])replicaSet=[^&]*(&|$)/g, (_match, lead, trail) =>
+    lead === '?' && trail === '&' ? '?' : trail === '&' ? lead : ''
+  );
+}
+
+function buildOptions() {
+  const tlsInsecure = (process.env.TLS_INSECURE || 'true').toLowerCase() !== 'false';
+  return {
+    directConnection: true,
+    tls: true,
+    tlsAllowInvalidCertificates: tlsInsecure,
+    serverSelectionTimeoutMS: Number(process.env.SERVER_SELECTION_TIMEOUT_MS || 10000),
+    // DocumentDB does not support server-side index collation. Mongoose's
+    // autoIndex is fine as long as schemas avoid `collation` on indexes.
+    autoIndex: true,
+  };
+}
+
+async function connect() {
+  const uri = sanitizeUri(process.env.MONGO_URI);
+  const dbName = process.env.MONGO_DB || 'mongoose_demo';
+
+  mongoose.set('strictQuery', true);
+
+  await mongoose.connect(uri, { ...buildOptions(), dbName });
+  return mongoose.connection;
+}
+
+module.exports = { connect, sanitizeUri, buildOptions };

documentdb-playground/mongoose/app/models/book.js

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+'use strict';
+
+const mongoose = require('mongoose');
+
+const { Schema } = mongoose;
+
+const bookSchema = new Schema(
+  {
+    title: { type: String, required: true, trim: true },
+    author: { type: String, required: true },
+    genres: { type: [String], default: [] },
+    pages: { type: Number, min: 1 },
+    published: { type: Date },
+    inStock: { type: Boolean, default: true },
+    rating: { type: Number, min: 0, max: 5 },
+  },
+  { timestamps: true }
+);
+
+// Compound index: exercises DocumentDB index creation via Mongoose autoIndex.
+// Note: no `collation` option here; DocumentDB does not implement collation indexes.
+bookSchema.index({ author: 1, title: 1 });
+
+module.exports = mongoose.model('Book', bookSchema);

documentdb-playground/mongoose/app/mongoose-crud-test.js

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+'use strict';
+
+/**
+ * Mongoose CRUD/compatibility test against DocumentDB.
+ *
+ * Usage:
+ *   MONGO_URI="mongodb://user:pass@host:10260/?tls=true&tlsAllowInvalidCertificates=true&directConnection=true" \
+ *     node mongoose-crud-test.js
+ *
+ * Or pass the URI as the first argument:
+ *   node mongoose-crud-test.js "mongodb://user:pass@host:10260/?..."
+ *
+ * Exercises connect, schema/model registration, index creation, insert,
+ * find, update, aggregation, and delete using Mongoose against the DocumentDB
+ * gateway. Exits non-zero on the first failure.
+ */
+
+const mongoose = require('mongoose');
+
+const { Schema } = mongoose;
+
+const URI = process.argv[2] || process.env.MONGO_URI;
+const DB_NAME = process.env.MONGO_DB || 'mongoose_test';
+
+let passed = 0;
+let failed = 0;
+let knownIssues = 0;
+
+function ok(name) {
+  passed += 1;
+  console.log(`  \u2705 ${name}`);
+}
+
+function fail(name, err) {
+  failed += 1;
+  console.error(`  \u274C ${name}: ${err && err.message ? err.message : err}`);
+}
+
+async function step(name, fn) {
+  try {
+    await fn();
+    ok(name);
+  } catch (err) {
+    fail(name, err);
+  }
+}
+
+// Run a step that is expected to hit a documented DocumentDB limitation. If it
+// fails with the known error, report it as a known issue (does not fail the
+// suite). If it unexpectedly passes, count it as a pass so this auto-detects a
+// fixed release. Any other error is a real failure.
+async function stepKnownIssue(name, fn, knownErrorPattern) {
+  try {
+    await fn();
+    ok(`${name} (known issue resolved)`);
+  } catch (err) {
+    const msg = err && err.message ? err.message : String(err);
+    if (knownErrorPattern.test(msg)) {
+      knownIssues += 1;
+      console.warn(`  \u26A0\uFE0F  ${name}: known DocumentDB issue (${msg})`);
+    } else {
+      fail(name, err);
+    }
+  }
+}
+
+function sanitizeUri(uri) {
+  return uri.replace(/([?&])replicaSet=[^&]*(&|$)/g, (_m, lead, trail) =>
+    lead === '?' && trail === '&' ? '?' : trail === '&' ? lead : ''
+  );
+}
+
+const widgetSchema = new Schema(
+  {
+    sku: { type: String, required: true, unique: true },
+    name: { type: String, required: true },
+    tags: { type: [String], default: [] },
+    price: { type: Number, min: 0 },
+    active: { type: Boolean, default: true },
+  },
+  { timestamps: true }
+);
+widgetSchema.index({ name: 1, price: -1 });
+
+async function run() {
+  if (!URI) {
+    console.error('MONGO_URI not provided. Pass it as $1 or set MONGO_URI.');
+    process.exit(2);
+  }
+
+  console.log('Mongoose DocumentDB compatibility test');
+  console.log('======================================');
+
+  const tlsInsecure = (process.env.TLS_INSECURE || 'true').toLowerCase() !== 'false';
+  mongoose.set('strictQuery', true);
+
+  await step('connect', async () => {
+    await mongoose.connect(sanitizeUri(URI), {
+      dbName: DB_NAME,
+      directConnection: true,
+      tls: true,
+      tlsAllowInvalidCertificates: tlsInsecure,
+      serverSelectionTimeoutMS: 15000,
+    });
+    const ping = await mongoose.connection.db.admin().command({ ping: 1 });
+    if (ping.ok !== 1) throw new Error('ping did not return ok:1');
+  });
+
+  if (mongoose.connection.readyState !== 1) {
+    console.error('\nConnection failed; aborting remaining steps.');
+    process.exit(1);
+  }
+
+  // Fresh collection per run to keep the test idempotent.
+  const collName = `widgets_${Date.now()}`;
+  const Widget = mongoose.model('Widget', widgetSchema, collName);
+
+  await step('create indexes (autoIndex / syncIndexes)', async () => {
+    await Widget.syncIndexes();
+  });
+
+  let createdId;
+  await step('insertOne (Model.create)', async () => {
+    const doc = await Widget.create({
+      sku: 'SKU-001',
+      name: 'Gizmo',
+      tags: ['alpha', 'beta'],
+      price: 9.99,
+    });
+    createdId = doc._id;
+    if (!createdId) throw new Error('no _id returned');
+  });
+
+  await step('insertMany', async () => {
+    const res = await Widget.insertMany([
+      { sku: 'SKU-002', name: 'Gadget', tags: ['beta'], price: 19.5 },
+      { sku: 'SKU-003', name: 'Widget', tags: ['alpha', 'gamma'], price: 4.25 },
+    ]);
+    if (res.length !== 2) throw new Error(`expected 2 inserted, got ${res.length}`);
+  });
+
+  // Known issue: gateway 0.109.0 (operator 0.2.0) fails point lookups that
+  // filter on `_id` with "trying to open a pruned relation". Treated as a known
+  // issue so the suite stays green; auto-detects a fixed release if it passes.
+  await stepKnownIssue(
+    'findById',
+    async () => {
+      const doc = await Widget.findById(createdId).lean();
+      if (!doc || doc.sku !== 'SKU-001') throw new Error('document not found or mismatched');
+    },
+    /pruned relation/i
+  );
+
+  await step('find with filter + sort + limit', async () => {
+    const docs = await Widget.find({ price: { $gte: 5 } }).sort({ price: -1 }).limit(10).lean();
+    if (docs.length !== 2) throw new Error(`expected 2 docs, got ${docs.length}`);
+    if (docs[0].price < docs[1].price) throw new Error('sort order incorrect');
+  });
+
+  await step('countDocuments', async () => {
+    const n = await Widget.countDocuments({});
+    if (n !== 3) throw new Error(`expected 3 docs, got ${n}`);
+  });
+
+  await step('updateOne ($set)', async () => {
+    const res = await Widget.updateOne({ sku: 'SKU-002' }, { $set: { price: 21 } });
+    if (res.modifiedCount !== 1) throw new Error(`expected 1 modified, got ${res.modifiedCount}`);
+  });
+
+  await step('findOneAndUpdate (returns new)', async () => {
+    const doc = await Widget.findOneAndUpdate(
+      { sku: 'SKU-003' },
+      { $push: { tags: 'delta' } },
+      { new: true }
+    ).lean();
+    if (!doc.tags.includes('delta')) throw new Error('update not applied');
+  });
+
+  await step('aggregation ($unwind/$group)', async () => {
+    const stats = await Widget.aggregate([
+      { $unwind: '$tags' },
+      { $group: { _id: '$tags', count: { $sum: 1 } } },
+      { $sort: { count: -1 } },
+    ]);
+    if (!stats.length) throw new Error('aggregation returned no results');
+  });
+
+  await step('unique index enforcement (duplicate sku rejected)', async () => {
+    try {
+      await Widget.create({ sku: 'SKU-001', name: 'Duplicate' });
+      throw new Error('duplicate insert was not rejected');
+    } catch (err) {
+      if (err.code !== 11000) throw new Error(`expected duplicate-key error (11000), got ${err.message}`);
+    }
+  });
+
+  await step('deleteOne', async () => {
+    const res = await Widget.deleteOne({ sku: 'SKU-002' });
+    if (res.deletedCount !== 1) throw new Error(`expected 1 deleted, got ${res.deletedCount}`);
+  });
+
+  await step('cleanup (drop collection)', async () => {
+    await Widget.collection.drop();
+  });
+
+  await mongoose.disconnect();
+
+  console.log('\n======================================');
+  console.log(`Passed: ${passed}  Failed: ${failed}  Known issues: ${knownIssues}`);
+  process.exit(failed === 0 ? 0 : 1);
+}
+
+run().catch((err) => {
+  console.error('Unexpected error:', err);
+  process.exit(1);
+});