diff --git a/app/controllers/related_contents_controller.rb b/app/controllers/related_contents_controller.rb
index 2be7d249d..ef550520c 100644
--- a/app/controllers/related_contents_controller.rb
+++ b/app/controllers/related_contents_controller.rb
@@ -7,7 +7,7 @@ class RelatedContentsController < ApplicationController
 
   def create
     if relationable_object && related_object
-      @relationable.relate_content(@related)
+      RelatedContent.create(parent_relationable: @relationable, child_relationable: @related)
 
       flash[:success] = t('related_content.success')
     else
diff --git a/app/models/concerns/relationable.rb b/app/models/concerns/relationable.rb
index 4acc399e4..4ce6bd3d3 100644
--- a/app/models/concerns/relationable.rb
+++ b/app/models/concerns/relationable.rb
@@ -5,8 +5,8 @@ module Relationable
     has_many :related_contents, as: :parent_relationable, dependent: :destroy
   end
 
-  def relate_content(relationable)
-    RelatedContent.find_or_create_by(parent_relationable: self, child_relationable: relationable)
+  def find_related_content(relationable)
+    RelatedContent.where(parent_relationable: self, child_relationable: relationable).first
   end
 
   def relationed_contents
diff --git a/app/views/relationable/_related_list.html.erb b/app/views/relationable/_related_list.html.erb
index 860790715..fe72145c0 100644
--- a/app/views/relationable/_related_list.html.erb
+++ b/app/views/relationable/_related_list.html.erb
@@ -1,9 +1,9 @@
 <ul class="related-content-list" id="related-content-list">
   <% @related_contents.each do |related| %>
-    <li id="related-content-<%= related.relate_content(relationable).id %>">
+    <li id="related-content-<%= related.find_related_content(relationable).id %>">
       <% if current_user %>
-        <span id="<%= dom_id(related.relate_content(relationable)) %>" class="js-score-actions score-actions">
-          <%= render 'relationable/score', related: related.relate_content(relationable) %>
+        <span id="<%= dom_id(related.find_related_content(relationable)) %>" class="js-score-actions score-actions">
+          <%= render 'relationable/score', related: related.find_related_content(relationable) %>
         </span>
       <% end %>