diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG
index fc75662ebc67e..5fea56f6285e3 100644
--- a/activerecord/CHANGELOG
+++ b/activerecord/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Do not implicitly mark recordss of has_many :through as readonly but do mark habtm records as readonly (eventually only on join tables without rich attributes). [Marcel Mollina Jr.]
+
 * Fixed broken OCIAdapter #4457 [schoenm@earthlink.net]
 
 
diff --git a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
index 9bc29b049f52b..3f6fdb6bac9de 100644
--- a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
@@ -41,7 +41,7 @@ def find(*args)
 
           options[:conditions] = conditions
           options[:joins] = @join_sql
-          options[:readonly] ||= false
+          options[:readonly] ||= !options[:joins].nil?
 
           if options[:order] && @reflection.options[:order]
             options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index f6bee7b6aec85..8078b4113bfde 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1325,7 +1325,7 @@ def set_readonly_option!(options) #:nodoc:
           unless options.has_key?(:readonly)
             if scoped?(:find, :readonly)
               options[:readonly] = scope(:find, :readonly)
-            elsif !options[:joins].blank?
+            elsif !options[:joins].blank? && !options[:select]
               options[:readonly] = true
             end
           end
@@ -2064,4 +2064,4 @@ def clone_attribute_value(reader_method, attribute_name)
         value
       end
   end
-end
\ No newline at end of file
+end
diff --git a/activerecord/test/readonly_test.rb b/activerecord/test/readonly_test.rb
index 55f5cbe4ca9a3..584eb735fe19b 100755
--- a/activerecord/test/readonly_test.rb
+++ b/activerecord/test/readonly_test.rb
@@ -3,6 +3,8 @@
 require 'fixtures/comment'
 require 'fixtures/developer'
 require 'fixtures/project'
+require 'fixtures/reader'
+require 'fixtures/person'
 
 # Dummy class methods to test implicit association scoping.
 def Comment.foo() find :first end
@@ -50,19 +52,23 @@ def test_find_with_joins_option_implies_readonly
   def test_habtm_find_readonly
     dev = Developer.find(1)
     assert !dev.projects.empty?
-    dev.projects.each { |p| assert !p.readonly? }
-    dev.projects.find(:all) { |p| assert !p.readonly? }
-    dev.projects.find(:all, :readonly => true) { |p| assert p.readonly? }
+    assert dev.projects.all?(&:readonly?)
+    assert dev.projects.find(:all).all?(&:readonly?)
+    assert dev.projects.find(:all, :readonly => true).all?(&:readonly?)
   end
 
   def test_has_many_find_readonly
     post = Post.find(1)
     assert !post.comments.empty?
-    post.comments.each { |r| assert !r.readonly? }
-    post.comments.find(:all) { |r| assert !r.readonly? }
-    post.comments.find(:all, :readonly => true) { |r| assert r.readonly? }
+    assert !post.comments.any?(&:readonly?)
+    assert !post.comments.find(:all).any?(&:readonly?)
+    assert post.comments.find(:all, :readonly => true).all?(&:readonly?)
   end
 
+  def test_has_many_with_through_is_not_implicitly_marked_readonly
+    assert people = Post.find(1).people
+    assert !people.any?(&:readonly?)
+  end
 
   def test_readonly_scoping
     Post.with_scope(:find => { :conditions => '1=1' }) do