more token entropy

app/models/token.rb

@@ -1,11 +1,22 @@
 class Token < ActiveRecord::Base
   belongs_to :user
 
-  before_create :generate_token
+  before_create :assign_token
+
+  CHARS = 32
 
   private
+  def assign_token
+    self.token = generate_token
+  end
+
   def generate_token
-    self.token = SecureRandom.uuid.gsub(/\-/,'')
+    loop do
+      candidate = SecureRandom.base64(CHARS).gsub(/\W/, '')
+      if candidate.size >= CHARS
+        return candidate[0...CHARS]
+      end
+    end
   end
 
 end

spec/models/token_spec.rb

@@ -1,5 +1,10 @@
 require 'rails_helper'
 
 RSpec.describe Token, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  context "#generate_token" do
+    subject (:token) { Token.new }
+    it "should generate an alphanumeric token of 32 characters" do
+      expect(token.send(:generate_token)).to match /[a-zA-Z0-9]{32}/
+    end
+  end
 end