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