Merge branch 'master' into testing

5 files changed, 15 insertions, 8 deletions

diff --git a/activerecord/lib/active_record/association_preload.rb b/activerecord/lib/active_record/association_preload.rb
index 6e194ab9b4..69300e5ce5 100644
--- a/activerecord/lib/active_record/association_preload.rb
+++ b/activerecord/lib/active_record/association_preload.rb
@@ -312,7 +312,7 @@ module ActiveRecord
           table_name = klass.quoted_table_name
           primary_key = klass.primary_key
           column_type = klass.columns.detect{|c| c.name == primary_key}.type
-          ids = id_map.keys.uniq.map do |id|
+          ids = id_map.keys.map do |id|
             if column_type == :integer
               id.to_i
             elsif column_type == :float
diff --git a/activerecord/lib/active_record/associations/has_one_through_association.rb b/activerecord/lib/active_record/associations/has_one_through_association.rb
index b78bd5d931..8073ebaf9f 100644
--- a/activerecord/lib/active_record/associations/has_one_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_through_association.rb
@@ -8,11 +8,10 @@ module ActiveRecord
         current_object = @owner.send(@reflection.through_reflection.name)
         
         if current_object
-          klass.destroy(current_object)
-          @owner.clear_association_cache
+          current_object.update_attributes(construct_join_attributes(new_value))
+        else
+          @owner.send(@reflection.through_reflection.name,  klass.send(:create, construct_join_attributes(new_value)))
         end
-        
-        @owner.send(@reflection.through_reflection.name,  klass.send(:create, construct_join_attributes(new_value)))
       end
       
     private
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 757102eb6b..dcc8277849 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1612,9 +1612,17 @@ module ActiveRecord #:nodoc:
           end
         end
 
+        def default_select(qualified)
+          if qualified
+            quoted_table_name + '.*'
+          else
+            '*'
+          end
+        end
+
         def construct_finder_sql(options)
           scope = scope(:find)
-          sql  = "SELECT #{options[:select] || (scope && scope[:select]) || ((options[:joins] || (scope && scope[:joins])) && quoted_table_name + '.*') || '*'} "
+          sql  = "SELECT #{options[:select] || (scope && scope[:select]) || default_select(options[:joins] || (scope && scope[:joins]))} "
           sql << "FROM #{(scope && scope[:from]) || options[:from] || quoted_table_name} "
 
           add_joins!(sql, options[:joins], scope)
diff --git a/activerecord/lib/active_record/calculations.rb b/activerecord/lib/active_record/calculations.rb
index 6f4e02b430..65512d534a 100644
--- a/activerecord/lib/active_record/calculations.rb
+++ b/activerecord/lib/active_record/calculations.rb
@@ -286,7 +286,7 @@ module ActiveRecord
           case operation
             when 'count' then value.to_i
             when 'sum'   then type_cast_using_column(value || '0', column)
-            when 'avg'   then value && (value == 0 ? 0.0.to_d : value.to_d)
+            when 'avg'   then value && (value.is_a?(Fixnum) ? value.to_f : value).to_d
             else type_cast_using_column(value, column)
           end
         end
diff --git a/activerecord/lib/active_record/version.rb b/activerecord/lib/active_record/version.rb
index 2479b75789..3c5a9b7df8 100644
--- a/activerecord/lib/active_record/version.rb
+++ b/activerecord/lib/active_record/version.rb
@@ -2,7 +2,7 @@ module ActiveRecord
   module VERSION #:nodoc:
     MAJOR = 2
     MINOR = 2
-    TINY  = 0
+    TINY  = 1
 
     STRING = [MAJOR, MINOR, TINY].join('.')
   end