diff --git a/.gitignore b/.gitignore
index 35bf47d..1abc64e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,4 @@ tmp
 .byebug_history
 polymorphic_integer_type_test
 gemfiles/*.lock
+.idea/
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..e7cb58e
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,13 @@
+### Changed
+
+## v3.2.1 (2023-12-14)
+
+### Fixed
+
+- Not proper assigning polymorphic value with `has_many` and `has_one` reflection.
+
+### Added
+
+- Added .idea/ folder to .gitignore
+
+### Changed
\ No newline at end of file
diff --git a/lib/polymorphic_integer_type.rb b/lib/polymorphic_integer_type.rb
index a68099c..b5bf33d 100644
--- a/lib/polymorphic_integer_type.rb
+++ b/lib/polymorphic_integer_type.rb
@@ -6,6 +6,7 @@
 require "polymorphic_integer_type/module_generator"
 require "polymorphic_integer_type/belongs_to_polymorphic_association_extension"
 require "polymorphic_integer_type/activerecord_5_0_0/polymorphic_array_value_extension"
+require "polymorphic_integer_type/polymorphic_foreign_association_extension"
 
 if ACTIVE_RECORD_VERSION < Gem::Version.new("5.2.0")
   require "polymorphic_integer_type/activerecord_5_0_0/association_query_handler_extension"
diff --git a/lib/polymorphic_integer_type/extensions.rb b/lib/polymorphic_integer_type/extensions.rb
index 9d43529..c6c1389 100644
--- a/lib/polymorphic_integer_type/extensions.rb
+++ b/lib/polymorphic_integer_type/extensions.rb
@@ -2,6 +2,10 @@ module PolymorphicIntegerType
 
   module Extensions
     module ClassMethods
+      ActiveRecord::Reflection::HasManyReflection.attr_accessor(:foreign_integer_type)
+      ActiveRecord::Reflection::HasManyReflection.attr_accessor(:integer_type)
+      ActiveRecord::Reflection::HasOneReflection.attr_accessor(:foreign_integer_type)
+      ActiveRecord::Reflection::HasOneReflection.attr_accessor(:integer_type)
 
       def belongs_to(name, scope = nil, **options)
         options = scope if scope.kind_of? Hash
@@ -64,8 +68,10 @@ def remove_type_and_establish_mapping(name, options, scope)
             condition = instance_exec(&scope).merge(condition) if scope.is_a?(Proc)
             condition
           }
+          return foreign_type, klass_mapping.to_i
         else
           options[:scope] ||= scope
+          return nil, nil
         end
       end
 
@@ -86,8 +92,10 @@ def has_many(name, scope = nil, **options, &extension)
           scope = nil
         end
 
-        remove_type_and_establish_mapping(name, options, scope)
-        super(name, options.delete(:scope), **options, &extension)
+        integer_type_values = remove_type_and_establish_mapping(name, options, scope)
+        super(name, options.delete(:scope), **options, &extension).tap do
+          remove_integer_type_and_set_attributes_and_extension(integer_type_values, reflections[name.to_s])
+        end
       end
 
       def has_one(name, scope = nil, **options)
@@ -96,8 +104,27 @@ def has_one(name, scope = nil, **options)
           scope = nil
         end
 
-        remove_type_and_establish_mapping(name, options, scope)
-        super(name, options.delete(:scope), **options)
+        integer_type_values = remove_type_and_establish_mapping(name, options, scope)
+        super(name, options.delete(:scope), **options).tap do
+          remove_integer_type_and_set_attributes_and_extension(integer_type_values, reflections[name.to_s])
+        end
+      end
+
+      def remove_integer_type_and_set_attributes_and_extension(integer_type_values, reflection)
+        foreign_integer_type = integer_type_values[0]
+        integer_type = integer_type_values[1]
+        is_polymorphic_integer = foreign_integer_type && integer_type
+
+        if is_polymorphic_integer
+          reflection.foreign_integer_type = foreign_integer_type
+          reflection.integer_type = integer_type
+
+          if Gem::Version.new(ActiveRecord::VERSION::STRING) < Gem::Version.new("6.1")
+            ActiveRecord::Associations::Association.prepend(PolymorphicIntegerType::PolymorphicForeignAssociationExtension)
+          else
+            ActiveRecord::Associations::ForeignAssociation.prepend(PolymorphicIntegerType::PolymorphicForeignAssociationExtension)
+          end
+        end
       end
 
 
diff --git a/lib/polymorphic_integer_type/polymorphic_foreign_association_extension.rb b/lib/polymorphic_integer_type/polymorphic_foreign_association_extension.rb
new file mode 100644
index 0000000..2b18d05
--- /dev/null
+++ b/lib/polymorphic_integer_type/polymorphic_foreign_association_extension.rb
@@ -0,0 +1,11 @@
+module PolymorphicIntegerType
+  module PolymorphicForeignAssociationExtension
+
+    def set_owner_attributes(record)
+      super
+      if reflection.foreign_integer_type && reflection.integer_type
+        record._write_attribute(reflection.foreign_integer_type, reflection.integer_type)
+      end
+    end
+  end
+end
diff --git a/lib/polymorphic_integer_type/version.rb b/lib/polymorphic_integer_type/version.rb
index 7bd53b6..28ec6e3 100644
--- a/lib/polymorphic_integer_type/version.rb
+++ b/lib/polymorphic_integer_type/version.rb
@@ -1,3 +1,3 @@
 module PolymorphicIntegerType
-  VERSION = "3.2.0"
+  VERSION = "3.2.1"
 end
diff --git a/spec/polymorphic_integer_type_spec.rb b/spec/polymorphic_integer_type_spec.rb
index 563fa49..3d56eb2 100644
--- a/spec/polymorphic_integer_type_spec.rb
+++ b/spec/polymorphic_integer_type_spec.rb
@@ -26,6 +26,28 @@
       expect(link.target_type).to eq("Food")
     end
 
+    context "from HasManyReflection" do
+      it "sets the source properly HasManyReflection" do
+        link_1 = Link.create()
+        link_2 = Link.create()
+        dog.source_links = [link_1, link_2]
+        expect(link_1.source_type).to eq("Animal")
+        expect(link_1.source_id).to eq(dog.id)
+        expect(link_2.source_type).to eq("Animal")
+        expect(link_1.source_id).to eq(dog.id)
+      end
+    end
+
+    context "from HasOneReflection" do
+      it "sets the source properly HasOneReflection" do
+        link = Link.create()
+        dog.source_link = link
+
+        expect(link.source_type).to eq("Animal")
+        expect(link.source_id).to eq(dog.id)
+      end
+    end
+
     context "when models are namespaced" do
       context "and mappings include namespaces" do
         it "sets the source_type" do
@@ -340,6 +362,10 @@ class InlineDrink2 < ActiveRecord::Base
       expect(link[:target_type]).to eq(13)
     end
 
+    it "pulls mapping from given hash" do
+      animal.source_links.new
+    end
+
     it "doesn't break string type polymorphic associations" do
       expect(link.normal_target).to eq(drink)
       expect(link.normal_target_type).to eq("InlineDrink2")
diff --git a/spec/support/animal.rb b/spec/support/animal.rb
index ca7db21..3a83839 100644
--- a/spec/support/animal.rb
+++ b/spec/support/animal.rb
@@ -3,5 +3,5 @@ class Animal < ActiveRecord::Base
 
   belongs_to :owner, class_name: "Person"
   has_many :source_links, as: :source, integer_type: true, class_name: "Link"
-
+  has_one :source_link, as: :source, integer_type: true, class_name: "Link"
 end
\ No newline at end of file