8 files changed, 67 insertions, 6 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index b1988172cb..5913bf7809 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,20 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add `ActiveRecord::Base.cache_timestamp_format` class attribute to control
+    the format of the timestamp value in the cache key.
+    This allows users to improve the precision of the cache key.
+    Fixes #8195.
+
+    *Rafael Mendonça França*
+
+*   Add `:nsec` date format. This can be used to improve the precision of cache key.
+
+    *Jamie Gaskins*
+
+*   Fix decorating columns for serialized attributes. Fixes #8441
+
+    *itzki*
+
 *   Session variables can be set for the `mysql`, `mysql2`, and `postgresql` adapters
     in the `variables: <hash>` parameter in `database.yml`. The key-value pairs of this
     hash will be sent in a `SET key = value` query on new database connections. See also:
diff --git a/activerecord/lib/active_record/integration.rb b/activerecord/lib/active_record/integration.rb
index 7bdc1bd4c6..7f877a6471 100644
--- a/activerecord/lib/active_record/integration.rb
+++ b/activerecord/lib/active_record/integration.rb
@@ -1,5 +1,16 @@
 module ActiveRecord
   module Integration
+    extend ActiveSupport::Concern
+
+    included do
+      ##
+      # :singleton-method:
+      # Indicates the format used to generate the timestamp format in the cache key.
+      # This is +:number+, by default.
+      class_attribute :cache_timestamp_format, :instance_writer => false
+      self.cache_timestamp_format = :nsec
+    end
+
     # Returns a String, which Action Pack uses for constructing an URL to this
     # object. The default implementation returns this record's id as a String,
     # or nil if this record's unsaved.
@@ -37,7 +48,7 @@ module ActiveRecord
       when new_record?
         "#{self.class.model_name.cache_key}/new"
       when timestamp = self[:updated_at]
-        timestamp = timestamp.utc.to_s(:nsec)
+        timestamp = timestamp.utc.to_s(cache_timestamp_format)
         "#{self.class.model_name.cache_key}/#{id}-#{timestamp}"
       else
         "#{self.class.model_name.cache_key}/#{id}"
diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index 628ab0f566..85fb4be992 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -224,11 +224,10 @@ module ActiveRecord
       def decorate_columns(columns_hash) # :nodoc:
         return if columns_hash.empty?
 
-        serialized_attributes.each_key do |key|
-          columns_hash[key] = AttributeMethods::Serialization::Type.new(columns_hash[key])
-        end
-
         columns_hash.each do |name, col|
+          if serialized_attributes.key?(name)
+            columns_hash[name] = AttributeMethods::Serialization::Type.new(col)
+          end
           if create_time_zone_conversion_attribute?(name, col)
             columns_hash[name] = AttributeMethods::TimeZoneConversion::Type.new(col)
           end
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 8644f2f496..c5c500279e 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -23,6 +23,8 @@ require 'models/edge'
 require 'models/joke'
 require 'models/bulb'
 require 'models/bird'
+require 'models/car'
+require 'models/bulb'
 require 'rexml/document'
 require 'active_support/core_ext/exception'
 
@@ -1442,6 +1444,21 @@ class BasicsTest < ActiveRecord::TestCase
     assert_equal "developers/#{dev.id}-#{dev.updated_at.utc.to_s(:nsec)}", dev.cache_key
   end
 
+  def test_cache_key_format_for_existing_record_with_updated_at_and_cache_timestamp_format_set
+    dev = CachedDeveloper.first
+    assert_equal "cached_developers/#{dev.id}-#{dev.updated_at.utc.to_s(:number)}", dev.cache_key
+  end
+
+  def test_cache_key_changes_when_child_touched
+    car = Car.create
+    Bulb.create(car: car)
+
+    key = car.cache_key
+    car.bulb.touch
+    car.reload
+    assert_not_equal key, car.cache_key
+  end
+
   def test_cache_key_format_for_existing_record_with_nil_updated_at
     dev = Developer.first
     dev.update_columns(updated_at: nil)
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index 068f3cf3cd..6962da298e 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -212,4 +212,17 @@ class SerializedAttributeTest < ActiveRecord::TestCase
     assert_kind_of BCrypt::Password, topic.content
     assert_equal(true, topic.content == password, 'password should equal')
   end
+
+  def test_serialize_attribute_via_select_method_when_time_zone_available
+    ActiveRecord::Base.time_zone_aware_attributes = true
+    Topic.serialize(:content, MyObject)
+
+    myobj = MyObject.new('value1', 'value2')
+    topic = Topic.create(content: myobj)
+
+    assert_equal(myobj, Topic.select(:content).find(topic.id).content)
+    assert_raise(ActiveModel::MissingAttributeError) { Topic.select(:id).find(topic.id).content }
+  ensure
+    ActiveRecord::Base.time_zone_aware_attributes = false
+  end
 end
diff --git a/activerecord/test/models/bulb.rb b/activerecord/test/models/bulb.rb
index e4c0278c0d..0109ef4f83 100644
--- a/activerecord/test/models/bulb.rb
+++ b/activerecord/test/models/bulb.rb
@@ -1,6 +1,6 @@
 class Bulb < ActiveRecord::Base
   default_scope { where(:name => 'defaulty') }
-  belongs_to :car
+  belongs_to :car, :touch => true
 
   attr_reader :scope_after_initialize, :attributes_after_initialize
 
diff --git a/activerecord/test/models/developer.rb b/activerecord/test/models/developer.rb
index 1c048bb6b4..683cb54a10 100644
--- a/activerecord/test/models/developer.rb
+++ b/activerecord/test/models/developer.rb
@@ -234,3 +234,8 @@ class ThreadsafeDeveloper < ActiveRecord::Base
     limit(1)
   end
 end
+
+class CachedDeveloper < ActiveRecord::Base
+  self.table_name = "developers"
+  self.cache_timestamp_format = :number
+end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 35778d008a..af14bc7bd5 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -115,6 +115,7 @@ ActiveRecord::Schema.define do
     t.integer :engines_count
     t.integer :wheels_count
     t.column :lock_version, :integer, :null => false, :default => 0
+    t.timestamps
   end
 
   create_table :categories, :force => true do |t|