fix has_many :through in combination with :uniq for Postgres and SQ…

…Lite3

These databases quote table names with double quotes instead of backticks.

closes mislav#24

lib/will_paginate/finder.rb

@@ -198,7 +198,7 @@ def wp_count(options, args, finder)
 
         if options[:select] and options[:select] =~ /^\s*DISTINCT\b/i
           # Remove quoting and check for table_name.*-like statement.
-          if options[:select].gsub('`', '') =~ /\w+\.\*/
+          if options[:select].gsub(/[`"]/, '') =~ /\w+\.\*/
             options[:select] = "DISTINCT #{klass.table_name}.#{klass.primary_key}"
           end
         else

test/finder_test.rb

@@ -469,5 +469,12 @@ def test_hmt_with_include
 
       # I cannot reproduce any of the failures from those reports :(
     end
+
+    def test_hmt_with_uniq
+      project = Project.find(1)
+      result = project.unique_replies.paginate :page => 1, :per_page => 1,
+        :order => 'replies.id'
+      assert_equal replies(:decisive), result.first
+    end
   end
 end

test/fixtures/project.rb

@@ -12,4 +12,6 @@ def find_recent(params = {})
       end
     end
   end
+
+  has_many :unique_replies, :through => :topics, :source => :replies, :uniq => true
 end