Class: Groupdate::SeriesBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/groupdate/series_builder.rb

Constant Summary collapse

CHECK_PERIODS = 
[:day, :week, :month, :quarter, :year]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(period:, time_zone:, day_start:, week_start:, n_seconds:, **options) ⇒ SeriesBuilder

Returns a new instance of SeriesBuilder.



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# File 'lib/groupdate/series_builder.rb', line 7

def initialize(period:, time_zone:, day_start:, week_start:, n_seconds:, **options)
  @period = period
  @time_zone = time_zone
  @week_start = week_start
  @day_start = day_start
  @n_seconds = n_seconds
  @options = options
  @week_start_key = Groupdate::Magic::DAYS[@week_start] if @week_start
end

Instance Attribute Details

#day_start ⇒ Object (readonly)

Returns the value of attribute day_start.



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# File 'lib/groupdate/series_builder.rb', line 3

def day_start
  @day_start
end

#n_seconds ⇒ Object (readonly)

Returns the value of attribute n_seconds.



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# File 'lib/groupdate/series_builder.rb', line 3

def n_seconds
  @n_seconds
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/groupdate/series_builder.rb', line 3

def options
  @options
end

#period ⇒ Object (readonly)

Returns the value of attribute period.



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# File 'lib/groupdate/series_builder.rb', line 3

def period
  @period
end

#time_zone ⇒ Object (readonly)

Returns the value of attribute time_zone.



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# File 'lib/groupdate/series_builder.rb', line 3

def time_zone
  @time_zone
end

#week_start ⇒ Object (readonly)

Returns the value of attribute week_start.



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# File 'lib/groupdate/series_builder.rb', line 3

def week_start
  @week_start
end

Instance Method Details

#change_zone ⇒ Object 



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# File 'lib/groupdate/series_builder.rb', line 130

def change_zone
  @change_zone ||= begin
    if ActiveSupport::VERSION::STRING >= "5.2"
      ->(time, zone) { time.change(zone: zone) }
    else
      # TODO make more efficient
      ->(time, zone) { zone.parse(time.strftime("%Y-%m-%d %H:%M:%S")) }
    end
  end
end

#generate(data, default_value:, series_default: true, multiple_groups: false, group_index: nil) ⇒ Object 



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# File 'lib/groupdate/series_builder.rb', line 17

def generate(data, default_value:, series_default: true, multiple_groups: false, group_index: nil)
  series = generate_series(data, multiple_groups, group_index)
  series = handle_multiple(data, series, multiple_groups, group_index)

  verified_data = {}
  series.each do |k|
    verified_data[k] = data.delete(k)
  end

  # this is a fun one
  # PostgreSQL and Ruby both return the 2nd hour when converting/parsing a backward DST change
  # Other databases and Active Support return the 1st hour (as expected)
  # Active Support good: ActiveSupport::TimeZone["America/Los_Angeles"].parse("2013-11-03 01:00:00")
  # MySQL good: SELECT CONVERT_TZ('2013-11-03 01:00:00', 'America/Los_Angeles', 'Etc/UTC');
  # Ruby not good: Time.parse("2013-11-03 01:00:00")
  # PostgreSQL not good: SELECT '2013-11-03 01:00:00'::timestamp AT TIME ZONE 'America/Los_Angeles';
  # we need to account for this here
  if series_default && CHECK_PERIODS.include?(period)
    data.each do |k, v|
      key = multiple_groups ? k[group_index] : k
      # TODO only do this for PostgreSQL
      # this may mask some inconsistent time zone errors
      # but not sure there's a better approach
      if key.hour == (key - 1.hour).hour && series.include?(key - 1.hour)
        key -= 1.hour
        if multiple_groups
          k[group_index]  = key
        else
          k = key
        end
        verified_data[k] = v
      elsif key != round_time(key)
        # only need to show what database returned since it will cast in Ruby time zone
        raise Groupdate::Error, "Database and Ruby have inconsistent time zone info. Database returned #{key}"
      end
    end
  end

  unless entire_series?(series_default)
    series = series.select { |k| verified_data[k] }
  end

  value = 0
  result = Hash[series.map do |k|
    value = verified_data[k] || (@options[:carry_forward] && value) || default_value
    key =
      if multiple_groups
        k[0...group_index] + [key_format.call(k[group_index])] + k[(group_index + 1)..-1]
      else
        key_format.call(k)
      end

    [key, value]
  end]

  result
end

#round_time(time) ⇒ Object 



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# File 'lib/groupdate/series_builder.rb', line 75

def round_time(time)
  if period == :custom
    return time_zone.at((time.to_time.to_i / n_seconds) * n_seconds)
  end

  time = time.to_time.in_time_zone(time_zone)

  if day_start != 0
    # apply day_start to a time object that's not affected by DST
    time = change_zone.call(time, utc)
    time -= day_start.seconds
  end

  time =
    case period
    when :second
      time.change(usec: 0)
    when :minute
      time.change(sec: 0)
    when :hour
      time.change(min: 0)
    when :day
      time.beginning_of_day
    when :week
      time.beginning_of_week(@week_start_key)
    when :month
      time.beginning_of_month
    when :quarter
      time.beginning_of_quarter
    when :year
      time.beginning_of_year
    when :hour_of_day
      time.hour
    when :minute_of_hour
      time.min
    when :day_of_week
      time.days_to_week_start(@week_start_key)
    when :day_of_month
      time.day
    when :month_of_year
      time.month
    when :day_of_year
      time.yday
    else
      raise Groupdate::Error, "Invalid period"
    end

  if day_start != 0 && time.is_a?(Time)
    time += day_start.seconds
    time = change_zone.call(time, time_zone)
  end

  time
end

#time_range ⇒ Object 



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# File 'lib/groupdate/series_builder.rb', line 141

def time_range
  @time_range ||= begin
    time_range = options[:range]
    # entire range must be Date if begin or end is Date
    if time_range.is_a?(Range) && (time_range.begin.is_a?(Date) || time_range.end.is_a?(Date))
      if time_range.begin
        start = time_zone.parse(time_range.first.to_s)
      end
      if time_range.end
        last = time_zone.parse(time_range.last.to_s)
        last += 1.day unless time_range.exclude_end?
      end
      time_range = Range.new(start, last, true)
    elsif !time_range && options[:last]
      if period == :quarter
        step = 3.months
      elsif period == :custom
        step = n_seconds
      elsif 1.respond_to?(period)
        step = 1.send(period)
      else
        raise ArgumentError, "Cannot use last option with #{period}"
      end
      if step
        # loop instead of multiply to change start_at - see #151
        start_at = now
        (options[:last].to_i - 1).times do
          start_at -= step
        end

        time_range =
          if options[:current] == false
            round_time(start_at - step)...round_time(now)
          else
            # extend to end of current period
            round_time(start_at)...(round_time(now) + step)
          end
      end
    end
    time_range
  end
end