3 files changed, 2 insertions, 19 deletions
diff --git a/activerecord/lib/active_record/associations/collection_association.rb b/activerecord/lib/active_record/associations/collection_association.rb
index 921237a735..de8afc9ccb 100644
--- a/activerecord/lib/active_record/associations/collection_association.rb
+++ b/activerecord/lib/active_record/associations/collection_association.rb
@@ -52,11 +52,11 @@ module ActiveRecord
 
       # Implements the ids writer method, e.g. foo.item_ids= for Foo.has_many :items
       def ids_writer(ids)
-        pk_type = reflection.association_primary_key_type
+        primary_key = reflection.association_primary_key
+        pk_type = klass.type_for_attribute(primary_key.to_s)
         ids = Array(ids).reject(&:blank?)
         ids.map! { |i| pk_type.cast(i) }
 
-        primary_key = reflection.association_primary_key
         records = klass.where(primary_key => ids).index_by do |r|
           r.public_send(primary_key)
         end.values_at(*ids).compact
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index e45228a2ec..a3f8bfd1f1 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -458,10 +458,6 @@ module ActiveRecord
         options[:primary_key] || primary_key(klass || self.klass)
       end
 
-      def association_primary_key_type
-        klass.type_for_attribute(association_primary_key.to_s)
-      end
-
       def active_record_primary_key
         @active_record_primary_key ||= options[:primary_key] || primary_key(active_record)
       end
@@ -859,10 +855,6 @@ module ActiveRecord
         actual_source_reflection.options[:primary_key] || primary_key(klass || self.klass)
       end
 
-      def association_primary_key_type
-        klass.type_for_attribute(association_primary_key.to_s)
-      end
-
       # Gets an array of possible <tt>:through</tt> source reflection names in both singular and plural form.
       #
       #   class Post < ActiveRecord::Base
diff --git a/activerecord/test/cases/reflection_test.rb b/activerecord/test/cases/reflection_test.rb
index 37c2235f1a..44055e5ab6 100644
--- a/activerecord/test/cases/reflection_test.rb
+++ b/activerecord/test/cases/reflection_test.rb
@@ -310,15 +310,6 @@ class ReflectionTest < ActiveRecord::TestCase
     assert_equal "custom_primary_key", Author.reflect_on_association(:tags_with_primary_key).association_primary_key.to_s # nested
   end
 
-  def test_association_primary_key_type
-    # Normal Association
-    assert_equal :integer, Author.reflect_on_association(:posts).association_primary_key_type.type
-    assert_equal :string,  Author.reflect_on_association(:essay).association_primary_key_type.type
-
-    # Through Association
-    assert_equal :string, Author.reflect_on_association(:essay_category).association_primary_key_type.type
-  end
-
   def test_association_primary_key_raises_when_missing_primary_key
     reflection = ActiveRecord::Reflection.create(:has_many, :edge, nil, {}, Author)
     assert_raises(ActiveRecord::UnknownPrimaryKey) { reflection.association_primary_key }