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class ExerciseAnswer < ApplicationRecord
#学生答题
belongs_to :user
belongs_to :exercise_question
belongs_to :exercise_choice , optional : true
has_many :exercise_answer_comments , :dependent = > :destroy
scope :search_exercise_answer , lambda { | name , key | where ( " #{ name } = ? " , key ) }
scope :search_answer_users , lambda { | name , ids | where ( " #{ name } " :ids ) }
scope :exercise_no_full_scores , lambda { | score | where ( " score > 0.0 AND score < ? " , score ) }
scope :exercise_answer_is_right , - > { where ( " score > ? " , 0 . 0 ) } #判断答案是否正确，
scope :score_reviewed , lambda { where ( " score >= ? " , 0 . 0 ) } #是否评分,用于判断主观题的
end
