Class: Groupdate::Magic

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(field, options) ⇒ Magic

Returns a new instance of Magic.



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

def initialize(field, options)
  @field = field
  @options = options

  raise "Unrecognized time zone" unless time_zone

  raise "Unrecognized :week_start option" if field == :week && !week_start
end

Instance Attribute Details

#field ⇒ Object

Returns the value of attribute field.



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# File 'lib/groupdate/magic.rb', line 5

def field
  @field
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/groupdate/magic.rb', line 5

def options
  @options
end

Instance Method Details

#group_by(enum, &_block) ⇒ Object 



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# File 'lib/groupdate/magic.rb', line 16

def group_by(enum, &_block)
  group = enum.group_by { |v| v = yield(v); v ? round_time(v) : nil }
  series(group, [], false, false, false)
end

#perform(relation, method, *args, &block) ⇒ Object 



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# File 'lib/groupdate/magic.rb', line 103

def perform(relation, method, *args, &block)
  # undo reverse since we do not want this to appear in the query
  reverse = relation.send(:reverse_order_value)
  relation = relation.except(:reverse_order) if reverse
  order = relation.order_values.first
  if order.is_a?(String)
    parts = order.split(" ")
    reverse_order = (parts.size == 2 && (parts[0].to_sym == field || (activerecord42? && parts[0] == "#{relation.quoted_table_name}.#{relation.quoted_primary_key}")) && parts[1].to_s.downcase == "desc")
    if reverse_order
      reverse = !reverse
      relation = relation.reorder(relation.order_values[1..-1])
    end
  end

  multiple_groups = relation.group_values.size > 1

  cast_method =
    case field
    when :day_of_week, :hour_of_day, :day_of_month, :month_of_year
      lambda { |k| k.to_i }
    else
      utc = ActiveSupport::TimeZone["UTC"]
      lambda { |k| (k.is_a?(String) || !k.respond_to?(:to_time) ? utc.parse(k.to_s) : k.to_time).in_time_zone(time_zone) }
    end

  count =
    begin
      Hash[relation.send(method, *args, &block).map { |k, v| [multiple_groups ? k[0...@group_index] + [cast_method.call(k[@group_index])] + k[(@group_index + 1)..-1] : cast_method.call(k), v] }]
    rescue NoMethodError
      raise "Be sure to install time zone support - https://github.com/ankane/groupdate#for-mysql"
    end

  series(count, (options.key?(:default_value) ? options[:default_value] : 0), multiple_groups, reverse)
end

#relation(column, relation) ⇒ Object 



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# File 'lib/groupdate/magic.rb', line 21

def relation(column, relation)
  if relation.default_timezone == :local
    raise "ActiveRecord::Base.default_timezone must be :utc to use Groupdate"
  end

  time_zone = self.time_zone.tzinfo.name

  adapter_name = relation.connection.adapter_name
  query =
    case adapter_name
    when "MySQL", "Mysql2", "Mysql2Spatial"
      case field
      when :day_of_week # Sunday = 0, Monday = 1, etc
        # use CONCAT for consistent return type (String)
        ["DAYOFWEEK(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?)) - 1", time_zone]
      when :hour_of_day
        ["(EXTRACT(HOUR from CONVERT_TZ(#{column}, '+00:00', ?)) + 24 - #{day_start / 3600}) % 24", time_zone]
      when :day_of_month
        ["DAYOFMONTH(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?))", time_zone]
      when :month_of_year
        ["MONTH(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?))", time_zone]
      when :week
        ["CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL ((#{7 - week_start} + WEEKDAY(CONVERT_TZ(#{column}, '+00:00', ?) - INTERVAL #{day_start} second)) % 7) DAY) - INTERVAL #{day_start} second, '+00:00', ?), '%Y-%m-%d 00:00:00') + INTERVAL #{day_start} second, ?, '+00:00')", time_zone, time_zone, time_zone]
      when :quarter
        ["DATE_ADD(CONVERT_TZ(DATE_FORMAT(DATE(CONCAT(EXTRACT(YEAR FROM CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?)), '-', LPAD(1 + 3 * (QUARTER(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?)) - 1), 2, '00'), '-01')), '%Y-%m-%d %H:%i:%S'), ?, '+00:00'), INTERVAL #{day_start} second)", time_zone, time_zone, time_zone]
      else
        format =
          case field
          when :second
            "%Y-%m-%d %H:%i:%S"
          when :minute
            "%Y-%m-%d %H:%i:00"
          when :hour
            "%Y-%m-%d %H:00:00"
          when :day
            "%Y-%m-%d 00:00:00"
          when :month
            "%Y-%m-01 00:00:00"
          else # year
            "%Y-01-01 00:00:00"
          end

        ["DATE_ADD(CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(#{column}, INTERVAL #{day_start} second), '+00:00', ?), '#{format}'), ?, '+00:00'), INTERVAL #{day_start} second)", time_zone, time_zone]
      end
    when "PostgreSQL", "PostGIS"
      case field
      when :day_of_week
        ["EXTRACT(DOW from #{column}::timestamptz AT TIME ZONE ? - INTERVAL '#{day_start} second')::integer", time_zone]
      when :hour_of_day
        ["EXTRACT(HOUR from #{column}::timestamptz AT TIME ZONE ? - INTERVAL '#{day_start} second')::integer", time_zone]
      when :day_of_month
        ["EXTRACT(DAY from #{column}::timestamptz AT TIME ZONE ? - INTERVAL '#{day_start} second')::integer", time_zone]
      when :month_of_year
        ["EXTRACT(MONTH from #{column}::timestamptz AT TIME ZONE ? - INTERVAL '#{day_start} second')::integer", time_zone]
      when :week # start on Sunday, not PostgreSQL default Monday
        ["(DATE_TRUNC('#{field}', (#{column}::timestamptz - INTERVAL '#{week_start} day' - INTERVAL '#{day_start} second') AT TIME ZONE ?) + INTERVAL '#{week_start} day' + INTERVAL '#{day_start} second') AT TIME ZONE ?", time_zone, time_zone]
      else
        ["(DATE_TRUNC('#{field}', (#{column}::timestamptz - INTERVAL '#{day_start} second') AT TIME ZONE ?) + INTERVAL '#{day_start} second') AT TIME ZONE ?", time_zone, time_zone]
      end
    else
      raise "Connection adapter not supported: #{adapter_name}"
    end

  if adapter_name == "MySQL" && field == :week
    query[0] = "CAST(#{query[0]} AS DATETIME)"
  end

  group = relation.group(Groupdate::OrderHack.new(relation.send(:sanitize_sql_array, query), field, time_zone))
  relation =
    if time_range.is_a?(Range)
      # doesn't matter whether we include the end of a ... range - it will be excluded later
      group.where("#{column} >= ? AND #{column} <= ?", time_range.first, time_range.last)
    else
      group.where("#{column} IS NOT NULL")
    end

  # TODO do not change object state
  @group_index = group.group_values.size - 1

  Groupdate::Series.new(self, relation)
end