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# File 'lib/multi_currency.rb', line 23
def multi_currency_for(columns)
multi_currency_columns = columns
multi_currency_columns.each do |column|
define_singleton_method "sum_#{column}" do |currency, date = nil|
formatted_date = date.nil? ? "#{column}_rate_date" : "'#{date.strftime("%Y-%m-%d")}'"
self.where(
"#{column}_currency IS NOT NULL AND #{column} IS NOT NULL").
sum("
CASE #{column}_currency
WHEN '#{currency.downcase}' THEN #{column}
ELSE #{column} * (SELECT exchange_rates.rate FROM exchange_rates WHERE (exchange_rates.from_code = #{column}_currency AND to_code = '#{currency.downcase}' AND date = #{formatted_date}) )
END").to_f
end
define_method "#{column}_in" do |currency_code, date = nil|
if self.send("#{column}_source_amount").present? && self.send("#{column}_source_currency").present?
date = self.send("#{column}_rate_date") if date.nil?
default_currency = self.send("#{column}_currency") rescue MultiCurrency.configuration.default_currency
rate = MultiCurrency.configuration.default_converter.get_rate_and_cache(default_currency, currency_code, date)
return self.send(column) * rate
else
return nil
end
end
end
define_method "do_currency_exchange" do
multi_currency_columns.each do |column|
if self.send("#{column}_source_amount").present? && self.send("#{column}_source_currency").present?
eval("self.#{column}_currency = '#{MultiCurrency.configuration.default_currency.downcase}'")
date = self.send("#{column}_rate_date") || Date.today
eval("self.#{column}_rate_date = date")
rate = MultiCurrency.configuration.default_converter.
get_rate_and_cache(self.send("#{column}_source_currency"), self.send("#{column}_currency"), date)
eval("self.#{column} = self.#{column}_source_amount * rate")
else
eval("self.#{column}_source_amount = nil")
eval("self.#{column}_source_currency = nil")
eval("self.#{column}_rate_date = nil")
eval("self.#{column}_currency = nil")
eval("self.#{column} = nil")
end
end
end
end
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