complex search with thinking sphinx - ruby-on-rails-3

Question

I'd like to do a complex search with thinking sphinx:
Search for users which:
-> live in a city (city_id attribute)
-> or has hability to move to a city (mobile_cities association)
-> or live at a maximum distance from a lat/long point, the maximum distance is different for each user and set in a mobility_distance attribute.
For now I did that with 3 differents search, I volontary set a big per_page number, then i merge the 3 results on a single array, an then paginate this array :
#users living in the #city
search_set_living = search_set.merge({:city_id => #city.id })
users_living = User.search :with => search_set_living.dup,
:page => 1, :per_page => 1000
#users declaring hability to move to the #city
search_set_mobile = search_set.merge({:mobile_cities_ids => #city.id })
users_mobile = User.search :with => search_set_mobile.dup, :page => 1, :per_page => 1000
#users living at a maximum distance from the origin point(custom distance for each user, max 30km)
search_set_around = search_set.merge({"#geodist" => 0.0..30_000.0})
users_around = User.search :geo => [#search_latitude * Math::PI / 180 , #search_longitude * Math::PI / 180],
:with => search_set_around.dup,
:page => 1, :per_page => 1000
users_around_filtered = users_around.dup.delete_if{|user| (user.mobility_distance * 1000 )< user.sphinx_attributes['#geodist'] }
#merge the 3 results in a array
all_users = (users_mobile.flatten + users_around_filtered.flatten).uniq
#look for facets and paginate the array
#facets = User.facets :with => {:user_id => all_users.map(&:id)}
#users_to_display = all_users.paginate(:page => params[:page], :per_page => 10)
This is working fine but i'm not satisfied:
-performance are not so good,
-I want the ability to sort on multiple attributes like this :order => "created_at DESC, #relevance DESC"
I want to do the exact same search but in a single sphinx's search.
I know that I should use the "OR Logic with Attribute Filters" from the docs but I don't know how to mix it with a geo_search call...
I really have no idea how to do that,
can you guys help me ?
Many thanks,

Answer 1

The :sphinx_select option is definitely your friend here, as you've guessed. Let's piece it together bit by bit:
logic = [
"city_id = #{#city.id}",
"IN(mobile_cities_ids, #{#city.id}",
"GEODIST(lat, lng, #{lat}, #{lng}) < (mobility_distance * 1000)"
]
User.search :sphinx_select => "*, #{logic.join(" OR ")}) AS valid",
:with => {:valid => true}
Add pagination as you like, tweak the attribute names if needed (maybe your lat/lng attributes are named something else). I don't think you need the IF call around that custom attribute like in the docs, but if things aren't working when they should be, maybe give it a shot. Should be good in a facets call too.

Answer 2

Great ! Thank you so much. I just needed to correct a little your syntax (some parenthesis missing) in order to get it work.
I had to add per_page and page arguments too, don't know really why.
logic = ["city_id = #{#city.id}",
"IN(mobile_cities_ids, #{#city.id})",
"GEODIST(latitude, longitude, #{#search_latitude * Math::PI / 180}, #{#search_longitude * Math::PI / 180}) < (mobility_distance * 1000)"]
search_set_logic = search_set.merge({:valid => true})
#users_to_display = User.search :sphinx_select => "*, (#{logic.join(" OR ")}) AS valid",
:with => search_set_logic.dup,
:sort_mode => :extended,
:order => "visibility DESC, last_login_at DESC",
:page => params[:page], :per_page => 10