diff --git a/app/services/post_service.rb b/app/services/post_service.rb
index 1d7e1a99..c82953e3 100644
--- a/app/services/post_service.rb
+++ b/app/services/post_service.rb
@@ -195,9 +195,7 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
       case metadata.type
       when 'has_and_belongs_to_many'
         associated_posts(value_was - value).each do |remove_post|
-          remove_post[inverse_attribute].value.delete(post.uuid.value)
-
-          associated_posts_to_save << remove_post
+          remove_relation_from(remove_post[inverse_attribute], post.uuid.value)
         end
 
         associated_posts(value - value_was).each do |add_post|
@@ -208,17 +206,12 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
         end
       when 'has_many'
         associated_posts(value_was - value).each do |remove_post|
-          # @todo por qué no podemos usar nil para deshabilitar un valor?
-          remove_post[inverse_attribute].value = ''
-
-          associated_posts_to_save << remove_post
+          remove_relation_from(remove_post[inverse_attribute], '')
         end
 
         associated_posts(value - value_was).each do |add_post|
           associated_posts(add_post[inverse_attribute].value_was).each do |remove_post|
-            remove_post[attribute].value.delete(add_post.uuid.value)
-
-            associated_posts_to_save << remove_post
+            remove_relation_from(remove_post[attribute], add_post.uuid.value)
           end
 
           add_post[inverse_attribute].value = post.uuid.value
@@ -228,9 +221,7 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
       when 'belongs_to'
         if value_was.present?
           associated_posts(value_was).each do |remove_post|
-            remove_post[inverse_attribute].value.delete(value_was)
-
-            associated_posts_to_save << remove_post
+            remove_relation_from(remove_post[inverse_attribute], value_was)
           end
         end
 
@@ -244,4 +235,15 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
       end
     end
   end
+
+  # @todo por qué no podemos usar nil para deshabilitar un valor?
+  def remove_relation_from(metadata, value)
+    case metadata.value
+    when Array then metadata.value.delete(value)
+    when String then metadata.value = ''
+    end
+
+    associated_posts_to_save << metadata.post
+    nil
+  end
 end