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@@ -828,7 +828,7 @@ module ActiveRecord #:nodoc:
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       def update_counters(id, counters)
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         updates = counters.inject([]) { |list, (counter_name, increment)|
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           sign = increment < 0 ? "-" : "+"
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-          list << "#{connection.quote_column_name(counter_name)} = #{connection.quote_column_name(counter_name)} #{sign} #{increment.abs}"
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+          list << "#{connection.quote_column_name(counter_name)} = COALESCE(#{connection.quote_column_name(counter_name)}, 0) #{sign} #{increment.abs}"
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         }.join(", ")
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         update_all(updates, "#{connection.quote_column_name(primary_key)} = #{quote_value(id)}")
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       end

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@@ -19,6 +19,7 @@ require 'models/warehouse_thing'
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 require 'rexml/document'
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 class Category < ActiveRecord::Base; end
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+class Categorization < ActiveRecord::Base; end
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 class Smarts < ActiveRecord::Base; end
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 class CreditCard < ActiveRecord::Base
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   class PinNumber < ActiveRecord::Base
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@@ -75,7 +76,7 @@ class TopicWithProtectedContentAndAccessibleAuthorName < ActiveRecord::Base
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 end
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 class BasicsTest < ActiveRecord::TestCase
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-  fixtures :topics, :companies, :developers, :projects, :computers, :accounts, :minimalistics, 'warehouse-things', :authors
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+  fixtures :topics, :companies, :developers, :projects, :computers, :accounts, :minimalistics, 'warehouse-things', :authors, :categorizations
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   def test_table_exists
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     assert !NonExistentTable.table_exists?
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@@ -130,7 +131,7 @@ class BasicsTest < ActiveRecord::TestCase
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   def test_read_attributes_before_type_cast
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     category = Category.new({:name=>"Test categoty", :type => nil})
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-    category_attrs = {"name"=>"Test categoty", "type" => nil}
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+    category_attrs = {"name"=>"Test categoty", "type" => nil, "categorizations_count" => nil}
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     assert_equal category_attrs , category.attributes_before_type_cast
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   end
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@@ -614,6 +615,22 @@ class BasicsTest < ActiveRecord::TestCase
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     assert_equal -2, Topic.find(2).replies_count
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   end
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+  def test_update_counter
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+    category = Category.first
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+    assert_nil category.categorizations_count
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+    assert_equal 2, category.categorizations.count
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+
0
+    Category.update_counters(category.id, "categorizations_count" => category.categorizations.count)
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+    category.reload
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+    assert_not_nil category.categorizations_count
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+    assert_equal 2, category.categorizations_count
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+
0
+    Category.update_counters(category.id, "categorizations_count" => category.categorizations.count)
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+    category.reload
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+    assert_not_nil category.categorizations_count
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+    assert_equal 4, category.categorizations_count
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+  end
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+
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   def test_update_all
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     assert_equal Topic.count, Topic.update_all("content = 'bulk updated!'")
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     assert_equal "bulk updated!", Topic.find(1).content

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@@ -66,6 +66,7 @@ ActiveRecord::Schema.define do
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   create_table :categories, :force => true do |t|
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     t.string :name, :null => false
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     t.string :type
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+    t.integer :categorizations_count
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   end
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   create_table :categories_posts, :force => true, :id => false do |t|