diff --git a/app/models/metadata_has_one.rb b/app/models/metadata_has_one.rb
new file mode 100644
index 00000000..d1705e7d
--- /dev/null
+++ b/app/models/metadata_has_one.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class MetadataHasOne < MetadataBelongsTo
+  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
diff --git a/app/views/posts/attribute_ro/_has_one.haml b/app/views/posts/attribute_ro/_has_one.haml
new file mode 100644
index 00000000..425e659e
--- /dev/null
+++ b/app/views/posts/attribute_ro/_has_one.haml
@@ -0,0 +1,6 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td{ dir: dir, lang: locale }
+    - p = metadata.has_one
+    - if p
+      = link_to p.title.value, site_post_path(site, p.id)
diff --git a/app/views/posts/attributes/_has_one.haml b/app/views/posts/attributes/_has_one.haml
new file mode 100644
index 00000000..b0d21f35
--- /dev/null
+++ b/app/views/posts/attributes/_has_one.haml
@@ -0,0 +1,7 @@
+.form-group
+  = label_tag "#{base}_#{attribute}", post_label_t(attribute, post: post)
+  = select_tag(plain_field_name_for(base, attribute),
+    options_for_select(metadata.values, metadata.value),
+    **field_options(attribute, metadata), include_blank: t('.empty'))
+  = render 'posts/attribute_feedback',
+    post: post, attribute: attribute, metadata: metadata