def proccess_variants(product)
      product.variants.each do |variant|
        from_price = variant.price_in(from_currency.upcase)
        next if from_price.new_record?
        new_price = variant.price_in(to_currency.upcase)
        new_price.amount = from_price.amount * rate
        new_price.save if new_price.changed?
      end
    end

    def proccess_master(product)
      from_price = product.price_in(from_currency.upcase)

      return if from_price.new_record?

      new_price = product.price_in(to_currency.upcase)
      new_price.amount = from_price.amount * rate
      new_price.save if new_price.changed?
    end

   def self.fetch_fixer
      base = Spree::Config.currency
      symbols = pluck(:to_currency).map(&:upcase).join(',')
      uri = URI("http://api.fixer.io/latest?base=#{base}&symbols=#{symbols}")
      response = Net::HTTP.get(uri)
      parsed_response = JSON.parse(response)
      return false if parsed_response['rates'].blank?
      parsed_response['rates'].each do |currency, value|
        find_by(to_currency: currency).try(:update_attributes, rate: value)
      end
      true
    end

    def fetch_fixer
      base = from_currency.upcase
      symbol = to_currency.upcase
      uri = URI("http://api.fixer.io/latest?base=#{base}&symbols=#{symbol}")
      response = Net::HTTP.get(uri)
      parsed_response = JSON.parse(response)
      new_rate = parsed_response['rates'].try(:[], symbol)
      update_attributes(rate: new_rate)
    end

app/models/spree/fx_rate.rb:12:5: C: Assignment Branch Condition size for create_supported_currencies is too high. [19.65/15]
    def self.create_supported_currencies
    ^^^