调整

app/models/user.rb

@@ -424,6 +424,10 @@ class User < ApplicationRecord
     end
   end
 
+  def is_collect? container
+    collections.where(container: container).exists?
+  end
+
   # 实训用户身份
   def shixun_identity(shixun)
     @identity =
@@ -649,10 +653,6 @@ class User < ApplicationRecord
     Educoder::Utils.random_hex(16)
   end
 
-  def is_collect? container
-    collections.where(container: container).exists?
-  end
-
   # 全部已认证
   def all_certified?
     authentication? && professional_certification?

app/views/shixuns/show.json.jbuilder

@@ -1,6 +1,6 @@
 json.fork_from @fork_from
 json.identity User.current.shixun_identity(@shixun)
-json.is_collect @user.is_collect?(@shixun)
+json.is_collect @user&.is_collect?(@shixun)
 
 json.power @power
 json.partial! 'shixuns/top', locals: { shixun: @shixun, current_myshixun: @current_myshixun }

app/views/subjects/show.json.jbuilder

@@ -5,7 +5,7 @@ json.challenges_count @subject.subject_challenge_count
 json.subject_score @subject.all_score
 json.member_count @subject.member_count
 
-json.is_collect @user.is_collect?(@subject)
+json.is_collect @user&.is_collect?(@subject)
 
 json.allow_delete (@subject.status != 2 && @is_creator) || @user.admin?
 json.publish_status publish_status(@subject, @is_manager)