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@@ -1,5 +1,10 @@
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 *Edge*
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+* Add :tokenizer option to validates_length_of to specify how to split up the attribute string. #507. [David Lowenfels] Example :
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+
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+  # Ensure essay contains at least 100 words.
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+  validates_length_of :essay, :minimum => 100, :too_short => "Your essay must be at least %d words."), :tokenizer => lambda {|str| str.scan(/\w+/) }
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+
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 * Allow conditions on multiple tables to be specified using hash. [Pratik Naik]. Example:
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   User.all :joins => :items, :conditions => { :age => 10, :items => { :color => 'black' } }

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@@ -479,8 +479,9 @@ module ActiveRecord
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       #     validates_length_of :fax, :in => 7..32, :allow_nil => true
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       #     validates_length_of :phone, :in => 7..32, :allow_blank => true
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       #     validates_length_of :user_name, :within => 6..20, :too_long => "pick a shorter name", :too_short => "pick a longer name"
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-      #     validates_length_of :fav_bra_size, :minimum=>1, :too_short=>"please enter at least %d character"
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-      #     validates_length_of :smurf_leader, :is=>4, :message=>"papa is spelled with %d characters... don't play me."
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+      #     validates_length_of :fav_bra_size, :minimum => 1, :too_short => "please enter at least %d character"
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+      #     validates_length_of :smurf_leader, :is => 4, :message => "papa is spelled with %d characters... don't play me."
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+      #     validates_length_of :essay, :minimum => 100, :too_short => "Your essay must be at least %d words."), :tokenizer => lambda {|str| str.scan(/\w+/) }
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       #   end
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       #
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       # Configuration options:
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@@ -491,7 +492,6 @@ module ActiveRecord
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       # * <tt>:in</tt> - A synonym(or alias) for <tt>:within</tt>.
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       # * <tt>:allow_nil</tt> - Attribute may be +nil+; skip validation.
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       # * <tt>:allow_blank</tt> - Attribute may be blank; skip validation.
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-      #
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       # * <tt>:too_long</tt> - The error message if the attribute goes over the maximum (default is: "is too long (maximum is %d characters)").
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       # * <tt>:too_short</tt> - The error message if the attribute goes under the minimum (default is: "is too short (min is %d characters)").
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       # * <tt>:wrong_length</tt> - The error message if using the <tt>:is</tt> method and the attribute is the wrong size (default is: "is the wrong length (should be %d characters)").
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@@ -503,12 +503,16 @@ module ActiveRecord
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       # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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       #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
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       #   method, proc or string should return or evaluate to a true or false value.
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+      # * <tt>:tokenizer</tt> - Specifies how to split up the attribute string. (e.g. <tt>:tokenizer => lambda {|str| str.scan(/\w+/)}</tt> to
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+      #   count words as in above example.)
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+      #   Defaults to <tt>lambda{ |value| value.split(//) }</tt> which counts individual characters.
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       def validates_length_of(*attrs)
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         # Merge given options with defaults.
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         options = {
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           :too_long     => ActiveRecord::Errors.default_error_messages[:too_long],
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           :too_short    => ActiveRecord::Errors.default_error_messages[:too_short],
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-          :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length]
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+          :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length],
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+          :tokenizer    => lambda {|value| value.split(//)}
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         }.merge(DEFAULT_VALIDATION_OPTIONS)
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         options.update(attrs.extract_options!.symbolize_keys)
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@@ -535,7 +539,7 @@ module ActiveRecord
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             too_long  = options[:too_long]  % option_value.end
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             validates_each(attrs, options) do |record, attr, value|
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-              value = value.split(//) if value.kind_of?(String)
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+              value = options[:tokenizer].call(value) if value.kind_of?(String)
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               if value.nil? or value.size < option_value.begin
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                 record.errors.add(attr, too_short)
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               elsif value.size > option_value.end
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@@ -552,7 +556,7 @@ module ActiveRecord
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             message = (options[:message] || options[message_options[option]]) % option_value
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             validates_each(attrs, options) do |record, attr, value|
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-              value = value.split(//) if value.kind_of?(String)
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+              value = options[:tokenizer].call(value) if value.kind_of?(String)
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               record.errors.add(attr, message) unless !value.nil? and value.size.method(validity_checks[option])[option_value]
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             end
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         end

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@@ -1059,6 +1059,18 @@ class ValidationsTest < ActiveRecord::TestCase
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     end
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   end
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+  def test_validates_length_of_with_block
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+    Topic.validates_length_of :content, :minimum => 5, :too_short=>"Your essay must be at least %d words.", 
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+                                        :tokenizer => lambda {|str| str.scan(/\w+/) }
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+    t = Topic.create!(:content => "this content should be long enough")
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+    assert t.valid?
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+
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+    t.content = "not long enough"
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+    assert !t.valid?
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+    assert t.errors.on(:content)
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+    assert_equal "Your essay must be at least 5 words.", t.errors[:content]
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+  end
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+
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   def test_validates_size_of_association_utf8
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     with_kcode('UTF8') do
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       assert_nothing_raised { Topic.validates_size_of :replies, :minimum => 1 }