70 lines
2.1 KiB
Ruby
70 lines
2.1 KiB
Ruby
class ProxyExercise < ActiveRecord::Base
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after_initialize :generate_token
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has_and_belongs_to_many :exercises
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has_many :user_proxy_exercise_exercises
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def count_files
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exercises.count
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end
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def generate_token
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self.token ||= SecureRandom.hex(4)
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end
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private :generate_token
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def duplicate(attributes = {})
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proxy_exercise = dup
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proxy_exercise.attributes = attributes
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proxy_exercise
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end
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def to_s
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title
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end
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def selectMatchingExercise(user)
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assigned_user_proxy_exercise = user_proxy_exercise_exercises.where(user: user).first
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recommendedExercise =
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if (assigned_user_proxy_exercise)
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Rails.logger.info("retrieved assigned exercise for user #{user.id}: Exercise #{assigned_user_proxy_exercise.exercise}" )
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assigned_user_proxy_exercise.exercise
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else
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Rails.logger.info("find new matching exercise for user #{user.id}" )
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matchingExercise = findMatchingExercise(user)
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user.user_proxy_exercise_exercises << UserProxyExerciseExercise.create(user: user, exercise: matchingExercise, proxy_exercise: self)
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matchingExercise
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end
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recommendedExercise
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end
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def findMatchingExercise(user)
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exercises.shuffle.first
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end
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def score(user, ex)
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1
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end
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def getRelativeKnowledgeLoss(user, execises)
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# initialize knowledge for each tag with 0
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topic_knowledge_loss_user = Tag.all.map{|t| [t, 0]}.to_h
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topic_knowledge_max = Tag.all.map{|t| [t, 0]}.to_h
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execises.each do |ex|
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score = score(user, ex)
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ex.tags.each do |t|
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tag_ratio = ex.exercise_tags.where(tag: t).factor / ex.exercise_tags.inject(0){|sum, et| sum += et.factor }
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topic_knowledge = ex.expected_difficulty * tag_ratio
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topic_knowledge_loss_user[t] += (1-score) * topic_knowledge
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topic_knowledge_max[t] += topic_knowledge
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end
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end
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relative_loss = {}
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topic_knowledge_max.keys.each do |t|
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relative_loss[t] = topic_knowledge_loss_user[t] / topic_knowledge_max[t]
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end
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relative_loss
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end
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end |