mongodb/rails "exception: can't find special index: 2d for:" - ruby-on-rails

Question

i have a rails app where i have some problems with indexes. I search locations by name.
First i thought its a problem with the addresses.coords but iam not sure about it.
The relevant parts of the search controller:
#practices = Practice.published
#practices = #practices.where(:"addresses.country" => params[:country].upcase) if params[:country].present?
if params[:location].present? && latlng = get_coordinates
#practices = #practices.near_sphere(:"addresses.coords" => latlng).max_distance(:"addresses.coords" => get_distance )
end
# now find doctors based on resulting practices
#doctors = Doctor.published.in("organization_relations.practice_id" => #practices.distinct(:_id))
The complete crash log:
Moped::Errors::OperationFailure (The operation: #<Moped::Protocol::Command
#length=255
#request_id=646
#response_to=0
#op_code=2004
#flags=[]
#full_collection_name="um-contacts.$cmd"
#skip=0
#limit=-1
#selector={:distinct=>"practices", :key=>"_id", :query=>{"deleted_at"=>nil, "published_at"=>{"$lte"=>2012-11-05 15:17:14 UTC}, "addresses.country"=>"DE", "addresses.coords"=>{"$nearSphere"=>[13.4060912, 52.519171], "$maxDistance"=>0.01569612305760477}}}
#fields=nil>
failed with error 13038: "exception: can't find special index: 2d for: { deleted_at: null, published_at: { $lte: new Date(1352128634313) }, addresses.country: \"DE\", addresses.coords: { $nearSphere: [ 13.4060912, 52.519171 ], $maxDistance: 0.01569612305760477 } }"
See https://github.com/mongodb/mongo/blob/master/docs/errors.md
for details about this error.):
app/controllers/search_controller.rb:16:in `index'
Thats the result of the indexes, not sure how to query them from the addresses which are embedded via has_many.
> db.practices.getIndexes()
[
{
"v" : 1,
"key" : {
"_id" : 1
},
"ns" : "um-contacts.practices",
"name" : "_id_"
}
]
Help would be really appreciated!
Edit: Looks like the indexes for adresses.coords arent created,
db.system.indexes.find()
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "um-contacts.users", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "um-contacts.doctors", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "um-contacts.collaborations", "name" : "_i
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "um-contacts.practices", "name" : "_id_" }
but should be created within the practice class:
class Practice
...
embeds_many :addresses, cascade_callbacks: true, as: :addressable
...
field :name, type: String
field :kind, type: String
field :slug, type: String
index({"addresses.coords" => '2d'}, { min: -180, max: 180, background: true })
index({name: 1})
index({slug: 1}, { unique: true })
...
Anyone have an idea why its failing?

Answer 1

try to re-create your indexes. for mongoid:
rake db:mongoid:create_indexes