fix: has_one es como belongs_to

(cherry picked from commit 74ae4ef4ab)

app/models/metadata_has_one.rb

@@ -1,29 +1,3 @@
 # frozen_string_literal: true
 
-class MetadataHasOne < MetadataBelongsTo
+class MetadataHasOne < MetadataBelongsTo; end
-  alias has_one belongs_to
-  alias had_one belonged_to
-
-  def save
-    # XXX: DRY
-    if !changed?
-      self[:value] = document_value
-
-      return true
-    end
-
-    self[:value] = sanitize value
-
-    return true unless changed?
-    return true unless inverse?
-
-    had_one[inverse]&.value = '' if had_one
-    has_one[inverse]&.value = post.uuid.value if has_one
-
-    true
-  end
-
-  def related_methods
-    @related_methods ||= %i[has_one had_one].freeze
-  end
-end

app/services/post_service.rb

@@ -222,7 +222,7 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
 
           add_relation_to(add_post[inverse_attribute], post.uuid.value)
         end
-      when 'belongs_to'
+      when 'belongs_to', 'has_one'
         if value_was.present?
           associated_posts(value_was).each do |remove_post|
             remove_relation_from(remove_post[inverse_attribute], value_was)