DRY idiosyncratic handling of str/int 'last' value

Author: jrochkind

lib/oai/provider/resumption_token.rb

@@ -69,8 +69,7 @@ def self.extract_format(token_string)
     def initialize(options, expiration = nil, total = nil)
       @prefix = options[:metadata_prefix]
       @set = options[:set]
-      @last = options[:last].to_i
-      @last_str = options[:last].to_s
+      self.last = options[:last]
       @from = options[:from] if options[:from]
       @until = options[:until] if options[:until]
       @expiration = expiration if expiration
@@ -79,8 +78,7 @@ def initialize(options, expiration = nil, total = nil)
 
     # convenience method for setting the offset of the next set of results
     def next(last)
-      @last_str = last.to_s
-      @last = last.to_i
+      self.last = last
       self
     end
 
@@ -117,6 +115,13 @@ def to_s
 
     private
 
+    # take care of our logic to store an integer and a str version, for backwards
+    # compat where it was assumed to be an integer, as well as supporting string.
+    def last=(value)
+      @last = value.to_i
+      @last_str = value.to_s
+    end
+
     def encode_conditions
       encoded_token = @prefix.to_s.dup
       encoded_token << ".s(#{set})" if set