投稿ページでの「投稿ボタン」の非表示

app/views/partials/_app_header.html.slim

@@ -31,11 +31,14 @@ nav.navbar.navbar-fixed-top.navbar-original role="navigation"
             span.glyphicon.glyphicon-flag
             - if current_user.notifications.unread.any?
               span.badge = current_user.notifications.unread.recent.count
+
+        - unless params[:action] == 'new' && params[:controller] == 'posts'
           li.new-post-btn
             form
               a.btn.navbar-btn href=new_post_path
                 | 投稿する
                 = image_tag 'write.png', class: "write"
+
         li.dropdown
           a.dropdown-toggle data-toggle="dropdown"
             = current_user.name