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39 lines
1.7 KiB
39 lines
1.7 KiB
class SurveyItemResponse < ActiveRecord::Base
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TEACHER_RESPONSE_THRESHOLD = 17
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STUDENT_RESPONSE_THRESHOLD = 196
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belongs_to :academic_year
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belongs_to :school
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belongs_to :survey_item
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scope :for_measures, ->(measures) { joins(:survey_item).where('survey_items.measure_id': measures.map(&:id)) }
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scope :for_measure, ->(measure) { joins(:survey_item).where('survey_items.measure_id': measure.id) }
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scope :for_teacher_responses_for_measure, ->(measure) { for_measure(measure).where("survey_items.survey_item_id LIKE 't-%'") }
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scope :for_student_responses_for_measure, ->(measure) { for_measure(measure).where("survey_items.survey_item_id LIKE 's-%'") }
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def self.score_for_measure(measure:, school:, academic_year:)
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return nil unless SurveyItemResponse.sufficient_data?(measure: measure, school: school, academic_year: academic_year)
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SurveyItemResponse.for_measure(measure)
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.where(academic_year: academic_year, school: school)
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.average(:likert_score)
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end
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private
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def self.sufficient_data?(measure:, school:, academic_year:)
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meets_teacher_threshold = true
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meets_student_threshold = true
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if measure.includes_teacher_survey_items?
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meets_teacher_threshold = SurveyItemResponse.for_teacher_responses_for_measure(measure).where(academic_year: academic_year, school: school).count >= TEACHER_RESPONSE_THRESHOLD
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end
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if measure.includes_student_survey_items?
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meets_student_threshold = SurveyItemResponse.for_student_responses_for_measure(measure).where(academic_year: academic_year, school: school).count >= STUDENT_RESPONSE_THRESHOLD
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end
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meets_teacher_threshold and meets_student_threshold
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end
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end
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