Append a string to the end of an existing field in MongoDB

Question

I have a document with a field containing a very long string. I need to concatenate another string to the end of the string already contained in the field.

The way I

Answer 1

For example (it's append to the start, the same story ):

before

{ "_id" : ObjectId("56993251e843bb7e0447829d"), "name" : "London City", "city" : "London" }

db.airports
   .find( { $text: { $search: "City" } })
   .forEach(
       function(e, i){ 
           e.name='Big ' + e.name; 
           db.airports.save(e);
       }
    )

after:

{ "_id" : ObjectId("56993251e843bb7e0447829d"), "name" : "Big London City", "city" : "London" }