MongoDB update queries

gistfile1.js

//rename collection from fs to attachments

db.fs.files.renameCollection('attachments.files')
db.fs.chunks.renameCollection('attachments.chunks')

//move the tags 'AppendToApplication' and 'AgentDownload' to meta_tags

db.attachments.files.find({tags: {$exists: true}, meta_tags: {$exists: true}}).forEach(function (e) {
	var meta_tags = [];
	if(e.tags.forEach){
		e.tags.forEach(function (mt) {
			meta_tags.push(mt);
		});
	} else {
		meta_tags.push(e.tags);
	}
	meta_tags.push('company_level');
	e.meta_tags = meta_tags;
	delete e.tags;
	db.attachments.files.save(e);
});