solve a bug on has_ony / has_many caused by the caching mechanism

app/models/content_instance.rb

@@ -53,6 +53,14 @@ class ContentInstance
     Hash.new.replace(self.errors)
   end
 
+  def reload_parent!
+    self.class.reload_parent!
+  end
+
+  def self.reload_parent!
+    self._parent = self._parent.reload
+  end
+
   def to_liquid
     Locomotive::Liquid::Drops::Content.new(self)
   end

app/views/admin/custom_fields/types/_has_many.html.haml

@@ -1,3 +1,5 @@
+- field.target.constantize.reload_parent! # to make sure all the contents from the parent are loaded
+
 = form.custom_input field._alias.to_sym, :label => field.label, :hint => field.hint, :css => 'has-many' do
 
   .has-many-selector

app/views/admin/custom_fields/types/_has_one.html.haml

@@ -1,2 +1,4 @@
+- field.target.constantize.reload_parent! # to make sure all the contents from the parent are loaded
+
 = form.input field._alias.to_sym, :label => field.label, :hint => field.hint, :input_html => { :class => 'has_one' }, :as => :select, :collection => options_for_has_one(field), :selected => form.object.send(field._alias.to_sym).try(:_id)