检查字段是否存在mongodb node js

Question

I have a json data which is stored in mongodb. so when i parse thru url using node how to check if the data or field that already exists in db if not insert it. I am using mongodb node js driver to save data to db

example :

      {
       id :  "25"
       branch : "abc"
           {
             name : "xyz"
             email : 'xyz@abc.com'
            }
      }

so this is the json data i parse using node and store it in mongodb. what my question when i get same data again how to check in database if the field already exists in db or else insert it as a new field in collection

Answer 1

You can use a Unique Index ( http://docs.mongodb.org/manual/tutorial/create-a-unique-index/ ) to ensure that you don't insert the same data twice.

If you want to update a document if it exists or if not create it: Look at the save method ( http://docs.mongodb.org/manual/reference/method/db.collection.save/ )