Cant get MongoLab database to work on heroku - ruby-on-rails

Question

I have deployed my app to heroku but and I can see the app but the app is NOT accessing the mongolab database. I have tried resetting the database in console with
$ heroku run rake db:reset
but I get this error.
failed with error 13: "not authorized on ENV['MONGOID_DATABASE'] to execute command { dropDatabase: 1 }"
See https://github.com/mongodb/mongo/blob/master/docs/errors.md
Not sure what I am doing wrong, I have not setup an app with mongoid on heroku before, this is my first time
-UPDATE-
Here is the end of the log I have that seems to show the post is not working.
$ heroku logs
2015-09-25T16:20:15.770927+00:00 heroku[router]: at=info method=POST path="/managers" host=beta.herokuapp.com request_id=95709038-02e9-45b1-8300-0aebc287f6c1 fwd="162.239.42.196" dyno=web.1 connect=0ms service=178ms status=500 bytes=1480
2015-09-25T16:20:15.770408+00:00 app[web.1]: D, [2015-09-25T16:20:15.770342 #3] DEBUG -- : MOPED: 10.152.165.9:29821 QUERY database=ENV['MONGOID_DATABASE'] collection=managers selector={"email"=>"sample#email.com"} flags=[] limit=-1 skip=0 batch_size=nil fields={:_id=>1} runtime: 1.0352ms
Here are the router logs...
$ heroku logs --ps router
2015-09-25T20:40:46.935184+00:00 heroku[router]: at=info method=POST path="/managers" host=beta.herokuapp.com request_id=c1673463-a69f-4111-bd4d-01fdb5516ad0 fwd="162.239.42.196" dyno=web.1 connect=2ms service=109ms status=500 bytes=1480
2015-09-25T20:40:47.285029+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=beta.herokuapp.com request_id=1e998283-b02b-4cc5-83f6-7996a6991531 fwd="162.239.42.196" dyno=web.1 connect=1ms service=2ms status=200 bytes=143
2015-09-26T04:45:32.833599+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=beta.herokuapp.com request_id=59ccc2e7-18d4-4c08-8b08-a653f5d11714 fwd="2602:30a:2ef2:ac40:acb1:9144:79b4:affb,66.249.88.51" dyno=web.1 connect=1ms service=4ms status=200 bytes=143
I also see it failing to query the database
2015-09-26T05:03:39.852170+00:00 app[web.1]: Parameters: {"utf8"=>"✓", "authenticity_token"=>"WVGY+XLD...A=", "manager"=>{"name"=>"Blah Blah", "company"=>"Blah Blah CO.", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "commit"=>"Sign up"}
2015-09-26T05:03:40.138442+00:00 app[web.1]: D, [2015-09-26T05:03:40.138321 #3] DEBUG -- : MOPED: 10.152.165.9:29821 COMMAND database=admin command={:ismaster=>1} runtime: 23.5306ms
2015-09-26T05:03:40.146776+00:00 app[web.1]: Completed 500 Internal Server Error in 294ms
2015-09-26T05:03:40.146782+00:00 app[web.1]: Completed 500 Internal Server Error in 294ms
2015-09-26T05:03:40.152205+00:00 app[web.1]:
2015-09-26T05:03:40.152208+00:00 app[web.1]: Moped::Errors::QueryFailure (The operation: #<Moped::Protocol::Query
2015-09-26T05:03:40.152209+00:00 app[web.1]: #length=112
2015-09-26T05:03:40.152211+00:00 app[web.1]: #request_id=4
2015-09-26T05:03:40.152212+00:00 app[web.1]: #response_to=0
2015-09-26T05:03:40.152214+00:00 app[web.1]: #op_code=2004
2015-09-26T05:03:40.152215+00:00 app[web.1]: #flags=[]
2015-09-26T05:03:40.152216+00:00 app[web.1]: #full_collection_name="ENV['MONGOID_DATABASE'].managers"
2015-09-26T05:03:40.152218+00:00 app[web.1]: #skip=0
2015-09-26T05:03:40.152219+00:00 app[web.1]: #limit=-1
2015-09-26T05:03:40.152222+00:00 app[web.1]: #selector={"email"=>"sample#email.com"}
2015-09-26T05:03:40.152224+00:00 app[web.1]: #fields={:_id=>1}>
2015-09-26T05:03:40.152225+00:00 app[web.1]: failed with error 13: "not authorized for query on ENV['MONGOID_DATABASE'].managers"
2015-09-26T05:03:40.152227+00:00 app[web.1]:
2015-09-26T05:03:40.152228+00:00 app[web.1]: See https://github.com/mongodb/mongo/blob/master/docs/errors.md

Answer 1

I figured it out. The db was not connecting because the mongoid.yml file was incorrect. I tweaked the yml file and added the URI to the heroku variables and it worked correctly.