Updated mongoose

node_modules/mongoose/examples/population/population-across-three-collections.js

@@ -0,0 +1,135 @@
+
+var assert = require('assert');
+var mongoose = require('../../lib');
+var Schema = mongoose.Schema;
+var ObjectId = mongoose.Types.ObjectId;
+
+/**
+ * Connect to the db
+ */
+
+var dbname = 'testing_populateAdInfinitum_' + require('../../lib/utils').random();
+mongoose.connect('localhost', dbname);
+mongoose.connection.on('error', function() {
+  console.error('connection error', arguments);
+});
+
+/**
+ * Schemas
+ */
+
+var user = new Schema({
+  name: String,
+  friends: [{
+    type: Schema.ObjectId,
+    ref: 'User'
+  }]
+});
+var User = mongoose.model('User', user);
+
+var blogpost = Schema({
+  title: String,
+  tags: [String],
+  author: {
+    type: Schema.ObjectId,
+    ref: 'User'
+  }
+});
+var BlogPost = mongoose.model('BlogPost', blogpost);
+
+/**
+ * example
+ */
+
+mongoose.connection.on('open', function() {
+
+  /**
+   * Generate data
+   */
+
+  var userIds = [new ObjectId, new ObjectId, new ObjectId, new ObjectId];
+  var users = [];
+
+  users.push({
+    _id: userIds[0],
+    name: 'mary',
+    friends: [userIds[1], userIds[2], userIds[3]]
+  });
+  users.push({
+    _id: userIds[1],
+    name: 'bob',
+    friends: [userIds[0], userIds[2], userIds[3]]
+  });
+  users.push({
+    _id: userIds[2],
+    name: 'joe',
+    friends: [userIds[0], userIds[1], userIds[3]]
+  });
+  users.push({
+    _id: userIds[3],
+    name: 'sally',
+    friends: [userIds[0], userIds[1], userIds[2]]
+  });
+
+  User.create(users, function(err) {
+    assert.ifError(err);
+
+    var blogposts = [];
+    blogposts.push({
+      title: 'blog 1',
+      tags: ['fun', 'cool'],
+      author: userIds[3]
+    });
+    blogposts.push({
+      title: 'blog 2',
+      tags: ['cool'],
+      author: userIds[1]
+    });
+    blogposts.push({
+      title: 'blog 3',
+      tags: ['fun', 'odd'],
+      author: userIds[2]
+    });
+
+    BlogPost.create(blogposts, function(err) {
+      assert.ifError(err);
+
+      /**
+       * Population
+       */
+
+      BlogPost
+      .find({ tags: 'fun' })
+      .lean()
+      .populate('author')
+      .exec(function(err, docs) {
+        assert.ifError(err);
+
+        /**
+         * Populate the populated documents
+         */
+
+        var opts = {
+          path: 'author.friends',
+          select: 'name',
+          options: { limit: 2 }
+        };
+
+        BlogPost.populate(docs, opts, function(err, docs) {
+          assert.ifError(err);
+          console.log('populated');
+          var s = require('util').inspect(docs, { depth: null });
+          console.log(s);
+          done();
+        });
+      });
+    });
+  });
+});
+
+function done(err) {
+  if (err) console.error(err.stack);
+  mongoose.connection.db.dropDatabase(function() {
+    mongoose.connection.close();
+  });
+}