Direct reference_name calls to index_set_class.

This ensures that if IndexSet is customised, that customised class gets this method called as well, rather than the original implementation.

Of course, if `reference_name` isn’t customised, then it’s the original implementation that does get invoked, and that’s fine. This just keeps things consistent - always use whatever configuration’s index_set_class is set to.

This was prompted by thinking through how to support anonymous models as discussed in #1172 by @kalsan.

lib/thinking_sphinx/active_record/association_proxy/attribute_finder.rb

@@ -31,7 +31,7 @@ def indices
     @indices ||= begin
       configuration.preload_indices
       configuration.indices_for_references(
-        *ThinkingSphinx::IndexSet.reference_name(@association.klass)
+        *configuration.index_set_class.reference_name(@association.klass)
       ).reject &:distributed?
     end
   end

lib/thinking_sphinx/active_record/callbacks/update_callbacks.rb

@@ -47,7 +47,7 @@ def indices
   end
 
   def reference
-    ThinkingSphinx::IndexSet.reference_name(instance.class)
+    configuration.index_set_class.reference_name(instance.class)
   end
 
   def update(index)

lib/thinking_sphinx/index_set.rb

@@ -80,7 +80,7 @@ def mti_classes
 
   def references
     options[:references] || classes_and_ancestors.collect { |klass|
-      ThinkingSphinx::IndexSet.reference_name(klass)
+      self.class.reference_name(klass)
     }
   end
 

lib/thinking_sphinx/middlewares/sphinxql.rb

@@ -133,7 +133,7 @@ def indices
 
     def indices_match_classes?
       indices.collect(&:reference).uniq.sort == classes.collect { |klass|
-        ThinkingSphinx::IndexSet.reference_name(klass)
+        configuration.index_set_class.reference_name(klass)
       }.sort
     end
 

spec/thinking_sphinx/active_record/callbacks/update_callbacks_spec.rb

@@ -19,12 +19,13 @@ module Callbacks; end
     let(:klass)         { double(:name => 'Article') }
     let(:configuration) { double('configuration',
       :settings => {'attribute_updates' => true},
-      :indices_for_references => [index]) }
+      :indices_for_references => [index], :index_set_class => set_class) }
     let(:connection)    { double('connection', :execute => '') }
     let(:index)         { double 'index', :name => 'article_core',
       :sources => [source], :document_id_for_key => 3, :distributed? => false,
       :type => 'plain', :primary_key => :id}
     let(:source)        { double('source', :attributes => []) }
+    let(:set_class)     { double(:reference_name => :article) }
 
     before :each do
       stub_const 'ThinkingSphinx::Configuration',

spec/thinking_sphinx/middlewares/sphinxql_spec.rb

@@ -31,7 +31,7 @@ class SphinxQLSubclass
   let(:query)         { double('query') }
   let(:configuration) { double('configuration', :settings => {},
     index_set_class: set_class) }
-  let(:set_class)     { double(:new => index_set) }
+  let(:set_class)     { double(:new => index_set, :reference_name => :article) }
 
   before :each do
     stub_const 'Riddle::Query::Select', double(:new => sphinx_sql)
@@ -115,6 +115,7 @@ class SphinxQLSubclass
       model = double('model', :connection => double,
         :ancestors => [ActiveRecord::Base], :name => 'Animal')
       allow(index_set.first).to receive_messages :reference => :animal
+      allow(set_class).to receive_messages(:reference_name => :animal)
 
       search.options[:classes] = [model]