1 files changed, 50 insertions, 1 deletions
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index fb4b972282..77386e5e41 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,7 +1,56 @@
+*   Assigning an unknown attribute key to an `ActiveModel` instance during initialization
+    will now raise `ActiveModel::AttributeAssignment::UnknownAttributeError` instead of
+    `NoMethodError`
+
+    ```ruby
+    User.new(foo: 'some value')
+    # => ActiveModel::AttributeAssignment::UnknownAttributeError: unknown attribute 'foo' for User.
+    ```
+
+    *Eugene Gilburg*
+
+*   Extracted `ActiveRecord::AttributeAssignment` to `ActiveModel::AttributeAssignment`
+    allowing to use it for any object as an includable module
+
+    ``` ruby
+    class Cat
+      include ActiveModel::AttributeAssignment
+      attr_accessor :name, :status
+    end
+
+    cat = Cat.new
+    cat.assign_attributes(name: "Gorby", status: "yawning")
+    cat.name # => 'Gorby'
+    cat.status => 'yawning'
+    cat.assign_attributes(status: "sleeping")
+    cat.name # => 'Gorby'
+    cat.status => 'sleeping'
+    ```
+
+    *Bogdan Gusiev*
+
+*   Add `ActiveModel::Errors#details`
+
+    To be able to return type of used validator, one can now call `details`
+    on Errors instance:
+
+    ```ruby
+    class User < ActiveRecord::Base
+      validates :name, presence: true
+    end
+    ```
+
+    ```ruby
+    user = User.new; user.valid?; user.errors.details
+    => {name: [{error: :blank}]}
+    ```
+
+    *Wojciech Wnętrzak*
+
 *   Change validates_acceptance_of to accept true by default.
 
     The default for validates_acceptance_of is now "1" and true.
-    In the past, only "1" was the default and you were required to add 
+    In the past, only "1" was the default and you were required to add
     accept: true.
 
 *   Remove deprecated `ActiveModel::Dirty#reset_#{attribute}` and