diff --git a/app/models/metadata_has_many.rb b/app/models/metadata_has_many.rb
index 13f0dcf5..b4db4454 100644
--- a/app/models/metadata_has_many.rb
+++ b/app/models/metadata_has_many.rb
@@ -36,6 +36,8 @@ class MetadataHasMany < MetadataRelatedPosts
   def save
     super
 
+    self[:value] = self[:value].uniq
+
     return true unless changed?
     return true unless inverse?
 
diff --git a/app/views/posts/attributes/_new_belongs_to.haml b/app/views/posts/attributes/_new_belongs_to.haml
index 8cbe3ce0..7f9a66dd 100644
--- a/app/views/posts/attributes/_new_belongs_to.haml
+++ b/app/views/posts/attributes/_new_belongs_to.haml
@@ -26,7 +26,6 @@
       %span.placeholder.w-100
 
   .form-group
-    = hidden_field_tag name, ''
     .d-flex.align-items-center.justify-content-between
       %div
         = label_tag id, post_label_t(attribute, post: post), class: 'mb-0'
diff --git a/app/views/posts/attributes/_new_has_many.haml b/app/views/posts/attributes/_new_has_many.haml
index 3869591b..ff657359 100644
--- a/app/views/posts/attributes/_new_has_many.haml
+++ b/app/views/posts/attributes/_new_has_many.haml
@@ -26,7 +26,6 @@
       %span.placeholder.w-100
 
   .form-group
-    = hidden_field_tag name, ''
     .d-flex.align-items-center.justify-content-between
       %div
         = label_tag id, post_label_t(attribute, post: post), class: 'h3'