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87 lines
2.6 KiB
87 lines
2.6 KiB
module Dese
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module Scraper
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DELAY = 20 # The dese site will block you if you hit it too many times in a short period of time
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Prerequisites = Struct.new('Prerequisites', :filepath, :url, :selectors, :submit_id, :admin_data_item_id,
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:calculation)
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def reverse_score(likert_score:)
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return nil unless likert_score.present?
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likert_score = 1 if likert_score < 1
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likert_score = 5 if likert_score > 5
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(likert_score - 6).abs
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end
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def run
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academic_years = AcademicYear.all.order(range: :DESC)
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academic_years.each do |academic_year|
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prerequisites = yield academic_year
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document = get_html(url: prerequisites.url,
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selectors: prerequisites.selectors,
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submit_id: prerequisites.submit_id)
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unless document.nil?
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write_csv(document:, filepath: prerequisites.filepath, range: academic_year.range, id: prerequisites.admin_data_item_id,
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calculation: prerequisites.calculation)
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end
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end
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end
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def browser
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@browser ||= Watir::Browser.new
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end
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def get_html(url:, selectors:, submit_id:)
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browser.goto(url)
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selectors.each do |key, value|
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next unless browser.option(text: value).present?
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browser.select(id: key).select(text: value)
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end
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browser.button(id: submit_id).click
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sleep DELAY # Sleep to prevent hitting mass.edu with too many requests
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Nokogiri::HTML(browser.html)
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end
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def write_headers(filepath:, headers:)
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CSV.open(filepath, 'w') do |csv|
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csv << headers
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end
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end
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def write_csv(document:, filepath:, range:, id:, calculation:)
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table = document.css('tr')
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headers = document.css('.sorting')
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header_hash = headers.each_with_index.map { |header, index| [header.text, index] }.to_h
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CSV.open(filepath, 'a') do |csv|
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table.each do |row|
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items = row.css('td').map(&:text)
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dese_id = items[1].to_i
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next if dese_id.nil? || dese_id.zero?
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raw_likert_score = calculation.call(header_hash, items)
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raw_likert_score ||= 'NA'
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likert_score = raw_likert_score
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if likert_score != 'NA'
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likert_score = 5 if likert_score > 5
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likert_score = 1 if likert_score < 1
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likert_score = likert_score.round(2)
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end
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output = []
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output << raw_likert_score
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output << likert_score
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output << id
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output << range
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output << items
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output = output.flatten
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csv << output
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end
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end
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end
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end
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end
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