Fixed limited eager loading associations with numbers in the name [#2668 state:resolved]

Signed-off-by: Pratik Naik <pratiknaik@gmail.com>

activerecord/lib/active_record/associations.rb

@@ -1668,7 +1668,7 @@ module ActiveRecord
 
         def tables_in_string(string)
           return [] if string.blank?
-          string.scan(/([\.a-zA-Z_]+).?\./).flatten
+          string.scan(/([a-zA-Z_][\.\w]+).?\./).flatten
         end
 
         def tables_in_hash(hash)

activerecord/test/cases/associations/eager_test.rb

@@ -589,6 +589,10 @@ class EagerAssociationTest < ActiveRecord::TestCase
     assert_equal posts(:sti_post_and_comments, :sti_comments), Post.find(:all, :include => [:author, :comments], :conditions => "authors.name = 'David'", :order => 'UPPER(posts.title) DESC, posts.id', :limit => 2, :offset => 1)
   end
 
+  def test_limited_eager_with_numeric_in_association
+    assert_equal people(:david, :susan), Person.find(:all, :include => [:readers, :primary_contact, :number1_fan], :conditions => "number1_fans_people.first_name like 'M%'", :order => 'readers.id', :limit => 2, :offset => 0)
+  end
+
   def test_preload_with_interpolation
     assert_equal [comments(:greetings)], Post.find(posts(:welcome).id, :include => :comments_with_interpolated_conditions).comments_with_interpolated_conditions
   end

activerecord/test/fixtures/people.yml

@@ -2,14 +2,17 @@ michael:
   id: 1
   first_name: Michael
   primary_contact_id: 2
+  number1_fan_id: 3
   gender: M
 david:
   id: 2
   first_name: David
   primary_contact_id: 3
+  number1_fan_id: 1
   gender: M
 susan:
   id: 3
   first_name: Susan
   primary_contact_id: 2
+  number1_fan_id: 1
   gender: F

activerecord/test/models/person.rb

@@ -10,6 +10,7 @@ class Person < ActiveRecord::Base
 
   belongs_to :primary_contact, :class_name => 'Person'
   has_many :agents, :class_name => 'Person', :foreign_key => 'primary_contact_id'
+  belongs_to :number1_fan, :class_name => 'Person'
 
   named_scope :males, :conditions => { :gender => 'M' }
   named_scope :females, :conditions => { :gender => 'F' }

activerecord/test/schema/schema.rb

@@ -324,6 +324,7 @@ ActiveRecord::Schema.define do
     t.string     :first_name, :null => false
     t.references :primary_contact
     t.string     :gender, :limit => 1
+    t.references :number1_fan
     t.integer    :lock_version, :null => false, :default => 0
   end