How do I update a Mongo document after inserting it

Question

Let s say I insert the document   post     some dictionary   mongo id   mycollection insert post    Now  let s say I want to add a field and update it  How do I do that  This doesn t seem to work       post   mycollection find one    id  mongo id    post  newfield      abc  mycollection save post

User · Answer

This is an old question  but I stumbled onto this when looking for the answer so I wanted to give the update to the answer for reference   The methods save and update are deprecated      save to save  manipulate True  check keys True    kwargs    Save a   document in this collection       DEPRECATED - Use insert one   or replace one   instead       Changed in version 3 0  Removed the safe parameter  Pass w 0 for   unacknowledged write operations       update spec  document  upsert False  manipulate False  multi False    check keys True    kwargs  Update a document s  in this collection       DEPRECATED - Use replace one    update one    or update many     instead       Changed in version 3 0  Removed the safe parameter  Pass w 0 for   unacknowledged write operations    in the OPs particular case  it s better to use replace one

User · Answer

In pymongo you can update with  mycollection update    id  mongo id      set   post   upsert False  Upsert parameter will insert instead of updating if the post is not found in the database  Documentation is available at mongodb site   UPDATE For version   3 use update one instead of update   mycollection update one    id  mongo id      set   post   upsert False

User · Answer

According to the latest documentation about PyMongo titled Insert a Document  insert is deprecated  and following defensive approach  you should insert and update as follows   result   mycollection insert one post  post   mycollection find one    id   result inserted id    if post is not None      post  newfield      abc      mycollection save post

User · Answer

I will use collection save the changed dict  this way  I ve just tested this  and it still works for me  The following is quoted directly from pymongo doc    save to save   manipulate True   safe False     kwargs         Save a document in this collection       If to save already has an   id  then    an update    upsert  operation is performed and    any existing document with that   id  is   overwritten  Otherwise an insert   operation is performed  In this   case if manipulate is True an   id  will be added to to save and this   method returns the   id  of the saved document  If manipulate is False   the   id  will be added by the server but this method will return   None

User · Answer

mycollection find one and update    id   mongo id                                        set     newfield    abc       should work splendidly for you  If there is no document of id mongo id  it will fail  unless you also use upsert True  This returns the old document by default  To get the new one  pass return document ReturnDocument AFTER  All parameters are described in the API   The method was introduced for MongoDB 3 0  It was extended for 3 2  3 4  and 3 6

[python] How do I update a Mongo document after inserting it?

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