8 files changed, 28 insertions, 7 deletions
diff --git a/activemodel/lib/active_model.rb b/activemodel/lib/active_model.rb
index 4e1b3f7495..b95c174d6e 100644
--- a/activemodel/lib/active_model.rb
+++ b/activemodel/lib/active_model.rb
@@ -1,5 +1,5 @@
 #--
-# Copyright (c) 2004-2015 David Heinemeier Hansson
+# Copyright (c) 2004-2016 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index ef6141a51d..ea69e7549e 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -160,6 +160,15 @@ module ActiveModel
     #
     #   person.errors[:name]  # => ["cannot be nil"]
     #   person.errors['name'] # => ["cannot be nil"]
+    #
+    # Note that, if you try to get errors of an attribute which has
+    # no errors associated with it, this method will instantiate
+    # an empty error list for it and +keys+ will return an array
+    # of error keys which includes this attribute.
+    #
+    #   person.errors.keys    # => []
+    #   person.errors[:name]  # => []
+    #   person.errors.keys    # => [:name]
     def [](attribute)
       messages[attribute.to_sym]
     end
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index d74a3912d6..94514a0657 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -8,7 +8,7 @@ module ActiveModel
     MAJOR = 5
     MINOR = 0
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "beta2"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index b66dbf1afe..b64a8299e6 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -10,7 +10,7 @@ module ActiveModel
       included do
         extend ActiveModel::Naming
 
-        class_attribute :include_root_in_json
+        class_attribute :include_root_in_json, instance_writer: false
         self.include_root_in_json = false
       end
 
diff --git a/activemodel/lib/active_model/type/time.rb b/activemodel/lib/active_model/type/time.rb
index fe09f63a87..34e09f0aba 100644
--- a/activemodel/lib/active_model/type/time.rb
+++ b/activemodel/lib/active_model/type/time.rb
@@ -38,7 +38,7 @@ module ActiveModel
         fast_string_to_time(dummy_time_value) || begin
           time_hash = ::Date._parse(dummy_time_value)
           return if time_hash[:hour].nil?
-          new_time(*time_hash.values_at(:year, :mon, :mday, :hour, :min, :sec, :sec_fraction))
+          new_time(*time_hash.values_at(:year, :mon, :mday, :hour, :min, :sec, :sec_fraction, :offset))
         end
       end
     end
diff --git a/activemodel/lib/active_model/type/value.rb b/activemodel/lib/active_model/type/value.rb
index 9d1f267b41..0d2d6873a8 100644
--- a/activemodel/lib/active_model/type/value.rb
+++ b/activemodel/lib/active_model/type/value.rb
@@ -84,6 +84,10 @@ module ActiveModel
         false
       end
 
+      def map(value) # :nodoc:
+        yield value
+      end
+
       def ==(other)
         self.class == other.class &&
           precision == other.precision &&
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index f23c920d87..8159b9b1d3 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -47,9 +47,10 @@ module ActiveModel
       include HelperMethods
 
       attr_accessor :validation_context
+      private :validation_context=
       define_callbacks :validate, scope: :name
 
-      class_attribute :_validators
+      class_attribute :_validators, instance_writer: false
       self._validators = Hash.new { |h,k| h[k] = [] }
     end
 
diff --git a/activemodel/lib/active_model/validations/numericality.rb b/activemodel/lib/active_model/validations/numericality.rb
index 9c1e8b4ba7..ad7012df48 100644
--- a/activemodel/lib/active_model/validations/numericality.rb
+++ b/activemodel/lib/active_model/validations/numericality.rb
@@ -39,6 +39,10 @@ module ActiveModel
           return
         end
 
+        unless raw_value.is_a?(Numeric)
+          value = parse_raw_value_as_a_number(raw_value)
+        end
+
         options.slice(*CHECKS.keys).each do |option, option_value|
           case option
           when :odd, :even
@@ -63,12 +67,15 @@ module ActiveModel
     protected
 
       def is_number?(raw_value)
-        parsed_value = Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
-        !parsed_value.nil?
+        !parse_raw_value_as_a_number(raw_value).nil?
       rescue ArgumentError, TypeError
         false
       end
 
+      def parse_raw_value_as_a_number(raw_value)
+        Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
+      end
+
       def is_integer?(raw_value)
         /\A[+-]?\d+\z/ === raw_value.to_s
       end