Solution for IBM_DB in ISO-8859-1 - Problem with special character when update a object

persistence.rb

#Overwrite update method from active_record/persistence.rb
# Solution for IBM_DB in ISO-8859-1 - Problem with special character when update a object
module ActiveRecord
  module Persistence

    def update(attribute_names = @attributes.keys)
      klass = self.class
      #No composite primary key
      if !self.composite?
        attributes_with_values = arel_attributes_values(false, false, attribute_names)
        return 0 if attributes_with_values.empty?
        id_reg = klass.arel_table[klass.primary_key].eq(id)
      else
        attributes_with_values = arel_attributes_values(can_change_primary_key?, false, attribute_names)
        return 0 if attributes_with_values.empty?
        
        if !can_change_primary_key? and primary_key_changed?
          raise ActiveRecord::CompositeKeyError, "Cannot update primary key values without ActiveModel::Dirty"
        elsif primary_key_changed?
          id_reg = primary_key_was
        else
          id_reg = ids_hash
        end
      end
      # Recuperando columns: [ActiveRecord::ConnectionAdapters::IBM_DBColumn, value]
      #col_definitions = attributes_with_values.inject([]) do |ac,v|
      #  ac<<[klass.columns.find{|x| x.name==v.first.name}, v.last]
      #end
      
      column_hash = klass.connection.schema_cache.columns_hash klass.table_name
      db_columns_with_values = attributes_with_values.map { |attr,value|
        real_column = column_hash[attr.name]
        [real_column, value]
      }
      bind_attrs = attributes_with_values.dup
      baloes = []
      bind_attrs.keys.each_with_index do |column, i|
        real_column = db_columns_with_values[i].first
        bind_attrs[column] = klass.connection.substitute_at(real_column, i)
      end
      stmt = klass.unscoped.where(id_reg).arel.compile_update(bind_attrs)
      klass.connection.update stmt.to_sql.gsub("'?'", "?"), 'SQL', db_columns_with_values
    rescue
      klass.connection.update stmt.to_sql
    end
  end #Persistence
end #ActiveRecord