diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index 963b002..687cbba 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -6,6 +6,9 @@ Please add an entry to the "Unreleased changes" section in your pull requests.
 
 === Unreleased changes
 
+=== Version 4.3.1
+- Autocomplete now offers only relevant options available through scopes set on associations (#233)
+
 === Version 4.3.0
 
 - Prevent scoped_search from modifying an empty string on newer rubies (#229)
diff --git a/lib/scoped_search/auto_complete_builder.rb b/lib/scoped_search/auto_complete_builder.rb
index 68bf60f..f27ea85 100644
--- a/lib/scoped_search/auto_complete_builder.rb
+++ b/lib/scoped_search/auto_complete_builder.rb
@@ -207,6 +207,7 @@ def complete_value
 
     def complete_value_from_db(field, special_values, val)
       count = 20 - special_values.count
+
       completer_scope(field)
         .where(@options[:value_filter])
         .where(value_conditions(field.quoted_field, val))
@@ -224,7 +225,9 @@ def completer_scope(field)
 
       if field.klass != field.definition.klass
         reflection = field.definition.reflection_by_name(field.definition.klass, field.relation)
-        scope = scope.instance_exec(&reflection.scope) if reflection.try(:has_scope?)
+        sub_scope = reflection.active_record.joins(reflection.name)
+        sub_scope = sub_scope.select("#{field.klass.table_name}.#{field.klass.primary_key}")
+        scope = scope.where(field.klass.primary_key => sub_scope)
       end
 
       scope.respond_to?(:reorder) ? scope.reorder(Arel.sql(field.quoted_field)) : scope.scoped(:order => field.quoted_field)
diff --git a/spec/integration/auto_complete_spec.rb b/spec/integration/auto_complete_spec.rb
index 697391f..51c2d2f 100644
--- a/spec/integration/auto_complete_spec.rb
+++ b/spec/integration/auto_complete_spec.rb
@@ -45,6 +45,16 @@
         t.integer :foo_id
       end
 
+      ActiveRecord::Migration.create_table(:asds, :force => true) do |t|
+        t.integer :baz_id
+        t.string :string
+      end
+
+      ActiveRecord::Migration.create_table(:qwes, :force => true) do |t|
+        t.integer :asd_id
+        t.string :string
+      end
+
       class ::Bar < ActiveRecord::Base
         belongs_to :foo
       end
@@ -71,34 +81,61 @@ class ::Foo < ActiveRecord::Base
 
       class ::Baz < ActiveRecord::Base
         belongs_to :foo, -> { where(string: 'foo') }
+        has_one :asd, -> { where(string: 'foo') }
+        has_one :qwe, through: :asd
 
-        scoped_search :on => :string, :relation => :foo, :complete_value => true
+        scoped_search :on => :string, :relation => :foo, :complete_value => true, :rename => 'foos.string'.to_sym
+        scoped_search :on => :string, :relation => :asd, :complete_value => true, :rename => 'asds.string'.to_sym
+        scoped_search :on => :string, :relation => :qwe, :complete_value => true, :rename => 'qwes.string'.to_sym
       end
 
       class ::Infoo < ::Foo
       end
 
+      class ::Asd < ActiveRecord::Base
+        belongs_to :baz
+        has_one :qwe
+      end
+
+      class ::Qwe < ActiveRecord::Base
+        belongs_to :asd
+      end
+
       @qux_1 = Qux.create!()
       @qux_2 = Qux.create!()
       @foo_1 = Foo.create!(:string => 'foo', :another => 'temp 1', :explicit => 'baz', :int => 9  , :date => 'February 8, 2011' , :unindexed => 10, :qux => @qux_1)
       @foo_2 = Foo.create!(:string => 'foo', :another => 'temp 2', :explicit => 'baz', :int => 10  , :date => 'February 8, 2011' , :unindexed => 10, :qux => @qux_2)
-      Foo.create!(:string => 'bar', :another => 'temp "2"', :explicit => 'baz', :int => 22  , :date => 'February 10, 2011', :unindexed => 10)
+      @foo_3 = Foo.create!(:string => 'bar', :another => 'temp "2"', :explicit => 'baz', :int => 22  , :date => 'February 10, 2011', :unindexed => 10)
       Foo.create!(:string => 'baz', :another => nil,      :explicit => nil  , :int => nil, :date => nil                 , :unindexed => nil)
       20.times { Foo.create!(:explicit => "aaa") }
 
+      @baz_1 = Baz.create!(:foo => @foo_1)
+      @baz_2 = Baz.create!(:foo => @foo_2)
+      Baz.create!(:foo => @foo_3)
+
       Bar.create!(:related => 'lala',         :foo => @foo_1)
       Bar.create!(:related => 'another lala', :foo => @foo_1)
+
+      @asd_1 = Asd.create!(:string => 'foo', :baz => @baz_1)
+      @asd_2 = Asd.create!(:string => 'bar', :baz => @baz_2)
+      Qwe.create!(:asd => @asd_1, :string => 'qwe1')
+      Qwe.create!(:asd => @asd_2, :string => 'qwe2')
     end
 
     after(:all) do
       ActiveRecord::Migration.drop_table(:foos)
       ActiveRecord::Migration.drop_table(:bars)
       ActiveRecord::Migration.drop_table(:bazs)
+      ActiveRecord::Migration.drop_table(:asds)
+      ActiveRecord::Migration.drop_table(:qwes)
 
       Object.send :remove_const, :Foo
       Object.send :remove_const, :Bar
       Object.send :remove_const, :Baz
+      Object.send :remove_const, :Qux
       Object.send :remove_const, :Infoo
+      Object.send :remove_const, :Asd
+      Object.send :remove_const, :Qwe
 
       ScopedSearch::RSpec::Database.close_connection
     end
@@ -282,7 +319,11 @@ class ::Infoo < ::Foo
 
     context 'autocompleting with scopes' do
       it 'should honor the scope' do
-        ::Baz.complete_for('string =').should == ['string = foo']
+        Baz.complete_for('foos.string =').should == ['foos.string = "foo"']
+      end
+
+      it 'should honor scope on the through relation' do
+        Baz.complete_for('qwes.string =').should == ['qwes.string = "qwe1"']
       end
     end
   end
diff --git a/spec/integration/relation_querying_spec.rb b/spec/integration/relation_querying_spec.rb
index 107d605..9557571 100644
--- a/spec/integration/relation_querying_spec.rb
+++ b/spec/integration/relation_querying_spec.rb
@@ -249,13 +249,13 @@ class Joo < ActiveRecord::Base
       before do
 
         # Create some tables
-        ActiveRecord::Migration.create_table(:mars) { |t| t.integer :koo_id; t.integer :baz_id }
-        ActiveRecord::Migration.create_table(:bazs) { |t| t.string :related }
+        ActiveRecord::Migration.create_table(:mars) { |t| t.integer :koo_id; t.integer :zab_id }
+        ActiveRecord::Migration.create_table(:zabs) { |t| t.string :related }
         ActiveRecord::Migration.create_table(:koos) { |t| t.string :foo }
 
         # The related classes
-        class Mar < ActiveRecord::Base; belongs_to :baz; belongs_to :koo; end
-        class Baz < ActiveRecord::Base; has_many :mars; end
+        class Mar < ActiveRecord::Base; belongs_to :zab; belongs_to :koo; end
+        class Zab < ActiveRecord::Base; has_many :mars; end
 
         # The class on which to call search_for
         class Koo < ActiveRecord::Base
@@ -263,38 +263,38 @@ class Koo < ActiveRecord::Base
           # having the source option here is not needed for the statement correctness.
           # It is here to fail the code introduced in 2.6.2 that wrongly detected source instead of source_type
           # as an indication for a polymorphic relation.
-          has_many :bazs, :through => :mars, :source => :baz
+          has_many :zabs, :through => :mars, :source => :zab
 
-          scoped_search :relation => :bazs, :on => :related
+          scoped_search :relation => :zabs, :on => :related
         end
 
         @koo_1 = Koo.create!(:foo => 'foo')
         @koo_2 = Koo.create!(:foo => 'foo too')
         @koo_3 = Koo.create!(:foo => 'foo three')
 
-        @baz_1 = Baz.create(:related => 'baz')
-        @baz_2 = Baz.create(:related => 'baz too!')
+        @zab_1 = Zab.create(:related => 'zab')
+        @zab_2 = Zab.create(:related => 'zab too!')
 
-        @bar_1 = Mar.create!(:koo => @koo_1, :baz => @baz_1)
+        @bar_1 = Mar.create!(:koo => @koo_1, :zab => @zab_1)
         @bar_2 = Mar.create!(:koo => @koo_1)
-        @bar_3 = Mar.create!(:koo => @koo_2, :baz => @baz_1)
-        @bar_3 = Mar.create!(:koo => @koo_2, :baz => @baz_2)
-        @bar_3 = Mar.create!(:koo => @koo_2, :baz => @baz_2)
+        @bar_3 = Mar.create!(:koo => @koo_2, :zab => @zab_1)
+        @bar_3 = Mar.create!(:koo => @koo_2, :zab => @zab_2)
+        @bar_3 = Mar.create!(:koo => @koo_2, :zab => @zab_2)
         @bar_4 = Mar.create!(:koo => @koo_3)
       end
 
       after do
-        ActiveRecord::Migration.drop_table(:bazs)
+        ActiveRecord::Migration.drop_table(:zabs)
         ActiveRecord::Migration.drop_table(:mars)
         ActiveRecord::Migration.drop_table(:koos)
       end
 
-      it "should find the two records that are related to a baz record" do
-        Koo.search_for('baz').length.should == 2
+      it "should find the two records that are related to a zab record" do
+        Koo.search_for('zab').length.should == 2
       end
 
-      it "should find the two records that are related to a baz record" do
-        Koo.search_for('related=baz AND related="baz too!"').length.should == 1
+      it "should find the two records that are related to a zab record" do
+        Koo.search_for('related=zab AND related="zab too!"').length.should == 1
       end
     end
 
@@ -303,27 +303,27 @@ class Koo < ActiveRecord::Base
       before do
 
         # Create some tables
-        ActiveRecord::Migration.create_table(:zars) { |t| t.integer :baz_id }
-        ActiveRecord::Migration.create_table(:bazs) { |t| t.string :related }
+        ActiveRecord::Migration.create_table(:zars) { |t| t.integer :zab_id }
+        ActiveRecord::Migration.create_table(:zabs) { |t| t.string :related }
         ActiveRecord::Migration.create_table(:zoos) { |t| t.integer :zar_id; t.string :foo }
 
         # The related classes
-        class Zar < ActiveRecord::Base; belongs_to :baz; has_many :zoos; end
-        class Baz < ActiveRecord::Base; has_many :zars; end
+        class Zar < ActiveRecord::Base; belongs_to :zab; has_many :zoos; end
+        class Zab < ActiveRecord::Base; has_many :zars; end
 
         # The class on which to call search_for
         class Zoo < ActiveRecord::Base
           belongs_to :zar
-          has_many :bazs, :through => :zar
+          has_many :zabs, :through => :zar
 
-          scoped_search :relation => :bazs, :on => :related
+          scoped_search :relation => :zabs, :on => :related
         end
 
-        baz_1 = Baz.create(:related => 'baz')
-        baz_2 = Baz.create(:related => 'baz too!')
+        zab_1 = Zab.create(:related => 'zab')
+        zab_2 = Zab.create(:related => 'zab too!')
 
-        zar_1 = Zar.create!( :baz => baz_1)
-        zar_2 = Zar.create!( :baz => baz_2)
+        zar_1 = Zar.create!( :zab => zab_1)
+        zar_2 = Zar.create!( :zab => zab_2)
 
         Zoo.create!(:zar => zar_1, :foo => 'foo')
         Zoo.create!(:zar => zar_1, :foo => 'foo too')
@@ -331,17 +331,17 @@ class Zoo < ActiveRecord::Base
       end
 
       after do
-        ActiveRecord::Migration.drop_table(:bazs)
+        ActiveRecord::Migration.drop_table(:zabs)
         ActiveRecord::Migration.drop_table(:zars)
         ActiveRecord::Migration.drop_table(:zoos)
       end
 
-      it "should find the three records that are related to a baz record" do
-        Zoo.search_for('baz').length.should == 3
+      it "should find the three records that are related to a zab record" do
+        Zoo.search_for('zab').length.should == 3
       end
 
-      it "should find no records that are related to a baz record" do
-        Zoo.search_for('related=baz AND related="baz too!"').length.should == 0
+      it "should find no records that are related to a zab record" do
+        Zoo.search_for('related=zab AND related="zab too!"').length.should == 0
       end
     end
 
@@ -392,8 +392,8 @@ class Owner < ActiveRecord::Base
         @tag_2 = Tag.create!(:foo => 'foo too')
         @tag_3 = Tag.create!(:foo => 'foo three')
 
-        @dog_1 = Dog.create(:related => 'baz')
-        @dog_2 = Dog.create(:related => 'baz too!')
+        @dog_1 = Dog.create(:related => 'zab')
+        @dog_2 = Dog.create(:related => 'zab too!')
         @cat_1 = Cat.create(:related => 'mitzi')
 
         @owner_1 = Owner.create(:name => 'Fred', :dogs => [@dog_1])
@@ -429,11 +429,11 @@ class Owner < ActiveRecord::Base
       end
 
       it "should find the two tags that are related to a dog record" do
-        Tag.search_for('dog=baz').length.should == 2
+        Tag.search_for('dog=zab').length.should == 2
       end
 
       it "should find the 3 tags that are related to dogs record" do
-        Tag.search_for('baz').length.should == 3
+        Tag.search_for('zab').length.should == 3
       end
     end
 
@@ -547,22 +547,22 @@ class User < ActiveRecord::Base
       before do
 
         # Create some tables with namespaces
-        ActiveRecord::Migration.create_table(:zan_mars) { |t| t.integer :koo_id; t.integer :baz_id }
-        ActiveRecord::Migration.create_table(:zan_bazs) { |t| t.string :related }
+        ActiveRecord::Migration.create_table(:zan_mars) { |t| t.integer :koo_id; t.integer :zab_id }
+        ActiveRecord::Migration.create_table(:zan_zabs) { |t| t.string :related }
         ActiveRecord::Migration.create_table(:zan_koos) { |t| t.string :foo }   
 
         # The related classes
-        module Zan; class Mar < ActiveRecord::Base; belongs_to :baz; belongs_to :koo; self.table_name = "zan_mars"; end; end
-        module Zan; class Baz < ActiveRecord::Base; has_many :mars; self.table_name = "zan_bazs"; end; end
+        module Zan; class Mar < ActiveRecord::Base; belongs_to :zab; belongs_to :koo; self.table_name = "zan_mars"; end; end
+        module Zan; class Zab < ActiveRecord::Base; has_many :mars; self.table_name = "zan_zabs"; end; end
 
         # The class on which to call search_for
         module Zan
           class Koo < ActiveRecord::Base
             has_many :mars, :class_name => "Zan::Mar"
-            has_many :bazs, :through => :mars
+            has_many :zabs, :through => :mars
             self.table_name = "zan_koos"
 
-            scoped_search :relation => :bazs, :on => :related
+            scoped_search :relation => :zabs, :on => :related
           end
         end
 
@@ -570,29 +570,29 @@ class Koo < ActiveRecord::Base
         @koo_2 = Zan::Koo.create!(:foo => 'foo too')
         @koo_3 = Zan::Koo.create!(:foo => 'foo three')
 
-        @baz_1 = Zan::Baz.create(:related => 'baz')
-        @baz_2 = Zan::Baz.create(:related => 'baz too!')
+        @zab_1 = Zan::Zab.create(:related => 'zab')
+        @zab_2 = Zan::Zab.create(:related => 'zab too!')
 
-        @bar_1 = Zan::Mar.create!(:koo => @koo_1, :baz => @baz_1)
+        @bar_1 = Zan::Mar.create!(:koo => @koo_1, :zab => @zab_1)
         @bar_2 = Zan::Mar.create!(:koo => @koo_1)
-        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :baz => @baz_1)
-        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :baz => @baz_2)
-        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :baz => @baz_2)
+        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :zab => @zab_1)
+        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :zab => @zab_2)
+        @bar_3 = Zan::Mar.create!(:koo => @koo_2, :zab => @zab_2)
         @bar_4 = Zan::Mar.create!(:koo => @koo_3)
       end
 
       after do
-        ActiveRecord::Migration.drop_table(:zan_bazs)
+        ActiveRecord::Migration.drop_table(:zan_zabs)
         ActiveRecord::Migration.drop_table(:zan_mars)
         ActiveRecord::Migration.drop_table(:zan_koos)
       end
 
-      it "should find the two records that are related to a baz record" do
-        Zan::Koo.search_for('baz').length.should == 2
+      it "should find the two records that are related to a zab record" do
+        Zan::Koo.search_for('zab').length.should == 2
       end
 
-      it "should find the one record that is related to two baz records" do
-        Zan::Koo.search_for('related=baz AND related="baz too!"').length.should == 1
+      it "should find the one record that is related to two zab records" do
+        Zan::Koo.search_for('related=zab AND related="zab too!"').length.should == 1
       end
     end