Multiple db queries with RABL and Mongoid/Moped - mongoid

Question

I have a simple app that uses rabl and mongoid 3.1.0, with this action:
# index
#products = current_shop.products
The rabl code looks like this:
# index.json.rabl
collection #products
extends 'api/products/show'
# show.json.rabl
object #product
attributes :id
When I hit it, the logs show 4 requests related to #products:
MOPED: 127.0.0.1:27017 QUERY database=bamboo_development collection=products selector={"$query"=>{"shop_id"=>"511c7866fd896b1908000002"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 batch_size=nil fields=nil (0.5682ms)
MOPED: 127.0.0.1:27017 QUERY database=bamboo_development collection=products selector={"$query"=>{"shop_id"=>"511c7866fd896b1908000002"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 batch_size=nil fields=nil (1.1139ms)
MOPED: 127.0.0.1:27017 QUERY database=bamboo_development collection=products selector={"$query"=>{"shop_id"=>"511c7866fd896b1908000002"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=0 skip=0 batch_size=nil fields=nil (0.4492ms)
MOPED: 127.0.0.1:27017 QUERY database=bamboo_development collection=products selector={"$query"=>{"shop_id"=>"511c7866fd896b1908000002"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=0 skip=0 batch_size=nil fields=nil (0.4332ms)
When I do this:
#products = current_shop.products.search(params[:query])
render text: #products.map(&:name).join(",")
I get only one request related to #products:
MOPED: 127.0.0.1:27017 QUERY database=bamboo_development collection=products selector={"shop_id"=>"511c7866fd896b1908000002"} flags=[:slave_ok] limit=0 skip=0 batch_size=nil fields=nil (0.4611ms)
The duplicated queries look strange, does anyone know why that happens? It doesn't call child objects, just somewhat different collection queries, from what I see.

Answer 1

Lots of people getting same problem. Most likely because of rabl configuration problem. As recommended by Aymeric above, just do:
#products = current_shop.products.to_a