Updating embedded documents mongodb
When you call update, the database will look for a document matching .
The first one it finds will be the 65-year-old Joe.
Mongoose documents represent a one-to-one mapping to documents as stored in Mongo DB. There are many ways to retrieve documents from Mongo DB.
There are several variations on the find And Modify theme.
For example, suppose we are making major changes to a user document, which looks like the following: Now, doing a find One shows that the structure of the document has been updated.
A common mistake is matching more than one document with the criteria and then create a duplicate “_id” value with the second parameter.
This can be useful to do a dramatic schema migration.
It actually does a full-document replacement, re-placing the matched document with .
Always use $ operators for modifying individual key/value pairs.
, or any other character that you would like to use instead of $.
Then, if you choose, say, ~, you would use ~inc instead of $inc and ~gt instead of $gt.Mongo DB's update() and save() methods are used to update document into a collection.