Skip redundant check for postfixed isntance currency name

lib/money-rails/active_record/monetizable.rb

@@ -277,10 +277,6 @@ def write_monetized(name, subunit_name, value, validation_enabled, instance_curr
       end
 
       def currency_for(name, instance_currency_name, field_currency_name)
-        if MoneyRails::Configuration.currency_column[:postfix].present?
-          instance_currency_name_with_postfix = "#{name}#{MoneyRails::Configuration.currency_column[:postfix]}"
-        end
-
         if instance_currency_name.present? && respond_to?(instance_currency_name) &&
             Money::Currency.find(public_send(instance_currency_name))
 
@@ -289,11 +285,6 @@ def currency_for(name, instance_currency_name, field_currency_name)
           Money::Currency.find(field_currency_name.call(self))
         elsif field_currency_name
           Money::Currency.find(field_currency_name)
-        elsif instance_currency_name_with_postfix.present? &&
-               respond_to?(instance_currency_name_with_postfix) &&
-               Money::Currency.find(public_send(instance_currency_name_with_postfix))
-
-          Money::Currency.find(public_send(instance_currency_name_with_postfix))
         elsif self.class.respond_to?(:currency)
           self.class.currency
         else

spec/active_record/monetizable_spec.rb

@@ -992,14 +992,6 @@ class SubProduct < Product
         expect(currency.iso_code).to eq('CAD')
       end
 
-      it "detects currency based on inferred currency field" do
-        product = Product.new(:reduced_price_currency => 'CAD')
-        currency = product.send(:currency_for, :reduced_price, nil, nil)
-
-        expect(currency).to be_an_instance_of(Money::Currency)
-        expect(currency.iso_code).to eq('CAD')
-      end
-
       it "falls back to a registered currency" do
         product = Product.new
         currency = product.send(:currency_for, :amount, nil, nil)

spec/dummy/db/schema.rb

@@ -1,3 +1,4 @@
+# encoding: UTF-8
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.