Mongoid tagging gem that holds meta about tags in a scoped context.
Easily maintain a collection of Tag instances with aggregate counts from your model's tags.
实现实体和标签间的N2N关系，对基于tag查询实体的单向优化
Mongoid Taggable provides some helpers to create taggable documents.
Add multiple tag fields on Mongoid documents with aggregation capability.
It provides methods to enhance tags with meta data. Extension for gem mongoid_taggable_with_context
Mongoid Taggable provides some helpers to create taggable documents, can use many fields.