Re: setting the write concern to journal mode

[Stephen Steneker]

I am trying to follow the instructions here - http://docs.mongodb.org/manual/applications/replication/ and the commands that I am trying are -

1) cfg = rs.conf()
2) cfg.settings.getLastErrorDefaults = {w: "majority", j: true}
3) rs.reconfig(cfg)

When I do the first command and print the cfg object, the json document just has the _id, version and members (list). It does not have something called settings field in there for me to modify it. Because
of that when I do the 2) command, I am seeing - 

" TypeError: cfg.settings has no properties (shell):1 "

Hi Raj,

It looks like the documentation is assuming a `settings` property already exists.

You should be able to set this by replacing step 2 with:

  cfg.settings = { getLastErrorDefaults: {w: "majority", j: true}}

It's also worth nothing that this only sets the *default* getLastError behaviour for the replica set.  It is more typical to set the desired write concern in your application code.

Cheers,

Stephen