diff --git a/app/api/mobile/entities/project_package.rb b/app/api/mobile/entities/project_package.rb
index 278e9b85..50d4ff69 100644
--- a/app/api/mobile/entities/project_package.rb
+++ b/app/api/mobile/entities/project_package.rb
@@ -17,8 +17,8 @@ module Mobile
       expose :bidding_users_count, if: { type: :index }
       expose :min_price
       expose :max_price
-      expose :contact_name, if: ->(package, opts){ opts[:user].id == package.creator_id || opts[:user].admin? || opts[:user].business?  }
-      expose :contact_phone, if: ->(package, opts){ opts[:user].id == package.creator_id || opts[:user].admin? || opts[:user].business?  }
+      expose :contact_name, if: ->(package, opts){ opts[:user].present? && (opts[:user].id == package.creator_id || opts[:user].admin? || opts[:user].business?)  }
+      expose :contact_phone, if: ->(package, opts){ opts[:user].present? && (opts[:user].id == package.creator_id || opts[:user].admin? || opts[:user].business?)  }
 
       expose :updated_at do |package, _|
         package.updated_at.strftime('%Y-%m-%d %H:%M:%S')
@@ -65,6 +65,7 @@ module Mobile
 
       expose :operation, if: { type: :show } do |package, opts|
         user = opts[:user]
+        return {} if user.blank?
         is_creator = user.id == package.creator_id
         is_admin = user.admin? || user.business?
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 3145308c..39298061 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -4381,7 +4381,7 @@ module ApplicationHelper
       elsif  attachment.container_type == "Bid" && attachment.container && attachment.container.courses
         course = attachment.container.courses.first
         candown = User.current.member_of_course?(attachment.container.courses.first) || (course.is_public == 1 && attachment.is_public == 1)
-      elsif attachment.container_type == "Library" || attachment.container.class.to_s == "Library" #教学案例允许下载
+      elsif attachment.container_type == "Library" #教学案例允许下载
         candown = true
       elsif attachment.container_type == "ProjectPackage" #教学案例允许下载
         candown = true
diff --git a/app/views/libraries/_library_list.html.erb b/app/views/libraries/_library_list.html.erb
index 2b142b44..fc0e6e62 100644
--- a/app/views/libraries/_library_list.html.erb
+++ b/app/views/libraries/_library_list.html.erb
@@ -2,7 +2,7 @@
   <% if @libraries.present? %>
     <% @libraries.each do |library| %>
       <li class="library_list_item">
-        <% image_url = library.cover.present? ? named_attachment_path(library.cover.id, library.cover.filename) : 'educoder/library-default-cover.png' %>
+        <% image_url = library.cover.present? ? download_attachment_path(library.cover.id) : 'educoder/library-default-cover.png' %>
         <%= image_tag(image_url, width: 120, height: 90, class: 'mr15 mt3 radius4') %>
         <div class="flex1">
           <p class="clearfix mb15 lineh-40 mt10">