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A simplified version of the logic used in the function before my fix is as follow: ```ruby result = [] things = [0,1,2,3] max_values = 2 every = (things.size.to_f / max_values).ceil things.each_with_index do |t, index| next unless (t % every) === 0 result << t end p result # [0, 2] # 3 doesn’t get included ``` The problem is that if you get unlucky two times you won't get last tuple(s) and might get a very erroneous date. Double unlucky: - last tuple index % computed every !== 0 and you don't get the last tuple - the last tuple is related to a post with a very different date than the previous tuples (on year difference in our case)
33 lines
704 B
Ruby
33 lines
704 B
Ruby
# frozen_string_literal: true
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module TimelineLookup
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# Given an array of tuples containing (id, days_ago), return at most `max_values` worth of a
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# lookup table to help the front end timeline display dates associated with posts
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def self.build(tuples, max_values = 300)
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result = []
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every = (tuples.size.to_f / max_values).ceil
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last_days_ago = -1
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tuples.each_with_index do |t, idx|
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return result unless t.is_a?(Array)
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if idx != tuples.size - 1
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next unless (idx % every) === 0
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end
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days_ago = t[1]
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if (days_ago != last_days_ago)
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result << [idx + 1, days_ago]
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last_days_ago = days_ago
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end
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end
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result
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end
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end
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