better admin with an export tab

app/admin/users_admin.rb

@@ -9,6 +9,14 @@ Trestle.resource(:users) do
       text_area :objective
     end
 
+    tab :export, label: "Export Resume" do
+      safe_join([
+        link_to("Export as PDF", generate_users_admin_path(item), class: "btn btn-primary has-icon", target: "_blank"),
+        link_to("Export as TeX", generate_cls_users_admin_path(item), class: "btn btn-secondary has-icon", target: "_blank"),
+        link_to("Export as JSON", generate_json_users_admin_path(item), class: "btn btn-secondary has-icon", target: "_blank")
+      ], " ")
+    end
+
     tab :work_experiences, badge: (item.persisted? ? item.work_experiences.size : 0) do
       concat content_tag(:p, "User: #{item.to_s}")
       if item.persisted?
@@ -106,9 +114,6 @@ Trestle.resource(:users) do
     actions do |toolbar, instance, admin|
       toolbar.edit if admin && admin.actions.include?(:edit)
       toolbar.delete if admin && admin.actions.include?(:destroy)
-      toolbar.link 'CV', instance, action: :generate, method: :get, style: :primary, icon: "fa fa-file-pdf", target: "_blank"
-      toolbar.link 'CLS', instance, action: :generate_cls, method: :get, style: :secondary, icon: "fa", target: "_blank"
-      toolbar.link 'JSON', instance, action: :generate_json, method: :get, style: :secondary, icon: "fa", target: "_blank"
       toolbar.link 'Clone', instance, action: :clone, method: :post, style: :secondary, icon: "fa fa-copy"
     end
   end
@@ -135,11 +140,8 @@ Trestle.resource(:users) do
     end
 
     def generate_json
-      generate_json_resume
-    end
-
-    def generate_json_resume
       @user = admin.find_instance(params)
+      response.headers["Content-Disposition"] = "attachment; filename=resume.json"
       render template: "users/show", formats: [:json], layout: false
     end