Module: TimelineLookup

Defined in:
lib/timeline_lookup.rb

Class Method Summary collapse

Class Method Details

.build(tuples, max_values = 300) ⇒ Object

Given an array of tuples containing (id, days_ago), return at most ‘max_values` worth of a lookup table to help the front end timeline display dates associated with posts



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# File 'lib/timeline_lookup.rb', line 6

def self.build(tuples, max_values = 300)
  result = []

  every = (tuples.size.to_f / max_values).ceil

  last_days_ago = -1
  tuples.each_with_index do |t, idx|
    return result unless t.is_a?(Array)

    if idx != tuples.size - 1
      next unless (idx % every) === 0
    end

    days_ago = t[1]

    if (days_ago != last_days_ago)
      result << [idx + 1, days_ago]
      last_days_ago = days_ago
    end
  end

  result
end