// Migrate all users websites to the profile blurb field db.users.find({'profile.websites': {$exists: true}}).forEach(function (user) { db.users.update({_id: user._id}, { $set: {'profile.blurb': `${user.profile.blurb }\n * ${ user.profile.websites.join('\n * ')}`}, $unset: {'profile.websites': 1}, }); }); db.groups.find({'websites.0': {$exists: true}}).forEach(function (group) { db.groups.update({_id: group._id}, { $set: {description: `${group.description }\n * ${ group.websites.join('\n * ')}`}, $unset: {websites: 1}, }); });