Fix fetch has_many embedded association after adding to it

dev.yml

@@ -3,7 +3,7 @@ name: identity-cache
 up:
   - homebrew:
     - postgresql
-  - ruby: 2.4.1
+  - ruby: 2.4.10
   - railgun
   - bundler
 

lib/identity_cache/cached/reference/has_many.rb

@@ -20,8 +20,8 @@ def #{cached_ids_name}
             end
 
             def #{cached_accessor_name}
-              association_klass = association(:#{name}).klass
-              if association_klass.should_use_cache? && !#{name}.loaded?
+              assoc = association(:#{name})
+              if assoc.klass.should_use_cache? && !assoc.loaded? && assoc.target.blank?
                 #{records_variable_name} ||= #{reflection.class_name}.fetch_multi(#{cached_ids_name})
               else
                 #{name}.to_a

lib/identity_cache/cached/reference/has_one.rb

@@ -21,8 +21,8 @@ def #{cached_id_name}
             end
 
             def #{cached_accessor_name}
-              association_klass = association(:#{name}).klass
-              if association_klass.should_use_cache? && !association(:#{name}).loaded?
+              assoc = association(:#{name})
+              if assoc.klass.should_use_cache? && !assoc.loaded?
                 #{records_variable_name} ||= #{reflection.class_name}.fetch(#{cached_id_name}) if #{cached_id_name}
               else
                 #{name}

test/normalized_has_many_test.rb

@@ -244,4 +244,11 @@ def test_respects_should_use_cache_on_association
       end
     end
   end
+
+  def test_fetch_association_after_adding_to_it
+    item = Item.fetch(@record.id)
+    item.associated_records.create!(name: 'foo')
+    fetched_associated_records = item.fetch_associated_records
+    assert_equal(item.associated_records.length, fetched_associated_records.length)
+  end
 end