Thinking Sphinx searching search across all models - ruby-on-rails-3

Question

i've implemented search for induvidual models and it works.
Now i have my home page which has a form that has fields from several models of my application but searching one field at a time doesn't yield any result on the home page although i can see the query....(searching for tv_show name)
Parameters: {"utf8"=>"✓", "name"=>"count", "broadcast_date_from"=>"", "broadcast_date_to"=>"", "gender"=>"", "organization_id"=>"", "position_id"=>"", "alignment"=>"", "commit"=>"Generate"}
Sphinx Query (1.0ms) SELECT * FROM `episode_core`, `organization_core`, `person_core`, `position_core`, `profession_core`, `segment_core`, `tv_show_core` WHERE MATCH('*count*') AND `sphinx_deleted` = 0 ORDER BY `last_name` ASC, first_name ASC LIMIT 0, 20
Sphinx Found 0 results
Rendered home/index.html.erb within layouts/home (3.0ms)
Completed 200 OK in 13ms (Views: 12.9ms | ActiveRecord: 0.0ms)
when search the model tv_show i have a result.
Parameters: {"utf8"=>"✓", "name"=>"count", "channel"=>"", "starting_time"=>"", "ending_time"=>"", "commit"=>"Search"}
Sphinx Query (0.9ms) SELECT * FROM `tv_show_core` WHERE MATCH('*count*') AND `sphinx_deleted` = 0 ORDER BY `tv_name` ASC LIMIT 0, 20
Sphinx Found 2 results
TvShow Load (0.5ms) SELECT "tv_shows".* FROM "tv_shows" WHERE "tv_shows"."id" IN (9, 4)
Rendered tv_shows/index.html.erb within layouts/application (7.5ms)
Rendered tv_shows/_search.html.erb (0.9ms)
Completed 200 OK in 68ms (Views: 66.7ms | ActiveRecord: 0.5ms)
So why is there a difference?
global search no result
#results = ThinkingSphinx.search.search "#{params[:name]} ",
:star => /[\w#:]+/u,
:order => 'last_name ASC, first_name ASC',
:page => params[:page],
:per_page => 20
model search return results
#tv_shows = TvShow.search "#{params[:name]} #{params[:channel]} ",
:star => /[\w#:]+/u,
:order => 'tv_name ASC',
:page => params[:page],
:per_page => 20
UPDATE
ok removing the :order => 'last_name ASC, first_name ASC', get me somewhere.
Have another question
how do you make it query a specific model depending on the field used in the form?
Parameters: {"utf8"=>"✓", "name"=>"count", "broadcast_date_from"=>"", "broadcast_date_to"=>"", "gender"=>"", "organization_id"=>"", "position_id"=>"", "alignment"=>"", "commit"=>"Generate"}
Profession Load (0.9ms) SELECT "professions".* FROM "professions" ORDER BY name
Organization Load (2.5ms) SELECT "organizations".* FROM "organizations" ORDER BY name
Position Load (2.0ms) SELECT "positions".* FROM "positions" ORDER BY name
Sphinx Query (1.7ms) SELECT * FROM `episode_core`, `episode_delta`, `organization_core`, `organization_delta`, `person_core`, `person_delta`, `position_core`, `position_delta`, `profession_core`, `profession_delta`, `segment_core`, `segment_delta`, `tv_show_core`, `tv_show_delta` WHERE MATCH('*count*') AND `sphinx_deleted` = 0 LIMIT 0, 20
Sphinx Found 4 results
Organization Load (0.5ms) SELECT "organizations".* FROM "organizations" WHERE "organizations"."id" IN (109)
Position Load (0.4ms) SELECT "positions".* FROM "positions" WHERE "positions"."id" IN (164)
TvShow Load (0.4ms) SELECT "tv_shows".* FROM "tv_shows" WHERE "tv_shows"."id" IN (4, 9)
Here i am just using the tv_show field which refer to the TvShow model.
Adding a conditon is not helping....:condition => {:tv_name => params[:name]}
any insight appreciated.
Response(just in case)
Needed to add in the global search view :
<% for result in #results %>
<% if result.class.name == "Organization" %>
<%= render :partial => "organizations/result", :locals => { :result => result } %>
<% elsif result.class.name == "Position" %>
<%= render :partial => "positions/result", :locals => { :result => result } %>
<% elsif result.class.name == "TvShow" %>
<%= render :partial => "tv_shows/result", :locals => { :result => result } %>
<% end %>
<% end %>
and create partial ( _result.html.erb ) for each model in view folder to print the different fields (The partials are optional).