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							class  ExerciseUser  <  ApplicationRecord 
 
						
						
						
							  # commit_method 0 为默认, 1为学生的手动提交, ,  
 
						
						
						
							  belongs_to  :user 
 
						
						
						
							  belongs_to  :exercise 
 
						
						
						
							
 
						
						
						
							  has_many  :exercise_user_scores ,  dependent :  :destroy 
 
						
						
						
							
 
						
						
						
							  scope  :commit_exercise_by_status ,  lambda  {  | s |  where ( commit_status :  s )  } 
 
						
						
						
							  scope  :exercise_user_committed ,  - >  { where ( " commit_status != ? " , 0 )  } 
 
						
						
						
							  scope  :current_exercise_user ,  lambda  {  | user_id , exercise_id |  where ( user_id :  user_id , exercise_id : exercise_id ) } 
 
						
						
						
							  scope  :exercise_commit_users ,  lambda  { | user_ids |  where ( user_id : user_ids ) } 
 
						
						
						
							  scope  :exercise_review ,  - >  { where ( " subjective_score >= ? " , 0 . 0 ) }   #已评阅,测试版的不一样是因为测试版的 主观题默认为0。0分,  
 
						
						
						
							  scope  :exercise_unreview ,  - >  { where ( " subjective_score < ? " , 0 . 0 ) }  #未评阅 
 
						
						
						
							  scope  :search_by_exercise ,  lambda  { | ids |  where ( exercise_id : ids ) }   #根据试卷来查找 
 
						
						
						
							end