Try to fix problem with large identifiers for Postgres

.gitignore

@@ -9,3 +9,4 @@ rdoc
 database.yml
 tmp
 *.gem
+*~

lib/thinking_sphinx.rb

@@ -33,7 +33,7 @@
 
 module ThinkingSphinx
   mattr_accessor :database_adapter
-  
+
   # A ConnectionError will get thrown when a connection to Sphinx can't be
   # made.
   class ConnectionError < StandardError
@@ -47,7 +47,7 @@ def initialize(ids)
       self.ids = ids
     end
   end
-  
+
   # A SphinxError occurs when Sphinx responds with an error due to problematic
   # queries or indexes.
   class SphinxError < RuntimeError
@@ -57,23 +57,23 @@ def initialize(message = nil, results = nil)
       self.results = results
     end
   end
-  
+
   # The current version of Thinking Sphinx.
-  # 
+  #
   # @return [String] The version number as a string
-  # 
+  #
   def self.version
     open(File.join(File.dirname(__FILE__), '../VERSION')) { |f|
       f.read.strip
     }
   end
-  
+
   # The collection of indexed models. Keep in mind that Rails lazily loads
   # its classes, so this may not actually be populated with _all_ the models
   # that have Sphinx indexes.
   @@sphinx_mutex = Mutex.new
   @@context      = nil
-  
+
   def self.context
     if @@context.nil?
       @@sphinx_mutex.synchronize do
@@ -83,18 +83,18 @@ def self.context
         end
       end
     end
-    
+
     @@context
   end
-  
+
   def self.reset_context!
     @@sphinx_mutex.synchronize do
       @@context = nil
     end
   end
 
   def self.unique_id_expression(offset = nil)
-    "* #{context.indexed_models.size} + #{offset || 0}"
+    "* #{context.indexed_models.size}::INT8 + #{offset || 0}"
   end
 
   # Check if index definition is disabled.
@@ -103,7 +103,7 @@ def self.define_indexes?
     if Thread.current[:thinking_sphinx_define_indexes].nil?
       Thread.current[:thinking_sphinx_define_indexes] = true
     end
-    
+
     Thread.current[:thinking_sphinx_define_indexes]
   end
 
@@ -123,7 +123,7 @@ def self.deltas_enabled?
         ThinkingSphinx::Configuration.environment != "test"
       )
     end
-    
+
     Thread.current[:thinking_sphinx_deltas_enabled]
   end
 
@@ -144,7 +144,7 @@ def self.updates_enabled?
         ThinkingSphinx::Configuration.environment != "test"
       )
     end
-    
+
     Thread.current[:thinking_sphinx_updates_enabled]
   end
 
@@ -163,7 +163,7 @@ def self.suppress_delta_output?
   def self.suppress_delta_output=(value)
     Thread.current[:thinking_sphinx_suppress_delta_output] = value
   end
-  
+
   # Checks to see if MySQL will allow simplistic GROUP BY statements. If not,
   # or if not using MySQL, this will return false.
   #
@@ -175,7 +175,7 @@ def self.use_group_by_shortcut?
         ).all? { |key,value| value.nil? || value[/ONLY_FULL_GROUP_BY/].nil? }
       )
     end
-    
+
     Thread.current[:thinking_sphinx_use_group_by_shortcut]
   end
 
@@ -243,8 +243,9 @@ def self.mysql?
       jruby? && ::ActiveRecord::Base.connection.config[:adapter] == "jdbcmysql"
     )
   end
-  
+
   extend ThinkingSphinx::SearchMethods::ClassMethods
 end
 
 ThinkingSphinx::AutoVersion.detect
+