data and document versioning

[testbird]

For now only posting related infos here for reference:

• Whole Document handling pattern https://github.com/thiloplanz/v7files/wiki/Vermongo
• Specific "fields" with history array (see collection2 autoValue example) https://github.com/aldeed/meteor-collection2
• Language versions. To index language data correctly in MongoDB, it must be stored in specific language documents. http://docs.mongodb.org/manual/tutorial/create-text-index-on-multi-language-collection