2 files changed, 5 insertions, 5 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 912448e43c..a809c72ccd 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -2,6 +2,7 @@
 
 require 'active_support/core_ext/array/conversions'
 require 'active_support/core_ext/string/inflections'
+require 'active_support/core_ext/object/deep_dup'
 
 module ActiveModel
   # == Active \Model \Errors
@@ -77,7 +78,7 @@ module ActiveModel
 
     def initialize_dup(other) # :nodoc:
       @messages = other.messages.dup
-      @details  = other.details.dup
+      @details  = other.details.deep_dup
       super
     end
 
diff --git a/activemodel/lib/active_model/model.rb b/activemodel/lib/active_model/model.rb
index d51d6ddcc9..dac8d549a7 100644
--- a/activemodel/lib/active_model/model.rb
+++ b/activemodel/lib/active_model/model.rb
@@ -57,6 +57,7 @@ module ActiveModel
   # (see below).
   module Model
     extend ActiveSupport::Concern
+    include ActiveModel::AttributeAssignment
     include ActiveModel::Validations
     include ActiveModel::Conversion
 
@@ -75,10 +76,8 @@ module ActiveModel
     #   person = Person.new(name: 'bob', age: '18')
     #   person.name # => "bob"
     #   person.age  # => "18"
-    def initialize(params={})
-      params.each do |attr, value|
-        self.public_send("#{attr}=", value)
-      end if params
+    def initialize(attributes={})
+      assign_attributes(attributes) if attributes
 
       super()
     end