build_through_conditions

# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 230
        def build_through_conditions
          conditions = @reflection.through_reflection.options[:conditions]
          if conditions.is_a?(Hash)
            interpolate_sql(sanitize_sql(conditions)).gsub(
              @reflection.quoted_table_name,
              @reflection.through_reflection.quoted_table_name)
          elsif conditions
            interpolate_sql(sanitize_sql(conditions))
          end
        end