Module: ESA::Associations::AmountsExtension

Defined in:
app/models/esa/associations/amounts_extension.rb

Overview

Association extension for has_many :amounts relations. Internal.

Instance Method Summary collapse

Instance Method Details

#balance ⇒ Object

Returns a sum of the referenced Amount objects.



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# File 'app/models/esa/associations/amounts_extension.rb', line 23

def balance
  sums = group('esa_amounts.amount is null').
         group('esa_amounts.type').
         sum(:amount)

  signed = sums.map do |s|
    amount_is_nil, amount_type, amount = s.flatten
    amount_type = amount_type.demodulize.downcase

    if amount_type == "debit"
      amount
    elsif amount_type == "credit"
      - amount
    else
      nil
    end
  end

  if signed.all?
    return signed.inject(BigDecimal(0)){|x,y| x + y}
  else
    return nil
  end
end

#iterated_balance ⇒ Object

Returns a sum of the referenced Amount objects.



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# File 'app/models/esa/associations/amounts_extension.rb', line 60

def iterated_balance
  amounts = map do |a|
    if a.is_debit?
      a.amount
    elsif a.is_credit? and not a.amount.nil?
      - a.amount
    else
      nil
    end
  end
  
  if amounts.all?
    amounts.inject(BigDecimal(0)){|x,y| x + y}
  else
    return nil
  end
end

#iterated_total ⇒ Object

Returns a sum of the referenced Amount objects.



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# File 'app/models/esa/associations/amounts_extension.rb', line 49

def iterated_total
  amounts = map(&:amount)

  if amounts.all?
    amounts.inject(BigDecimal(0)){|x,y| x + y}
  else
    return nil
  end
end

#total ⇒ Object

Returns a total sum of the referenced Amount objects



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# File 'app/models/esa/associations/amounts_extension.rb', line 6

def total
  sums = group('esa_amounts.amount is null').
         sum(:amount)

  checked = sums.map do |s|
    amount_is_nil, amount = s.flatten
    amount
  end

  if checked.all?
    return checked.inject(BigDecimal(0)){|x,y| x + y}
  else
    return nil
  end
end