Add AC::Parameters#include?

Fixes #22818

3 files changed, 11 insertions, 1 deletions

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index dec8e0cadf..93f75ba635 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Add `ActionController::Parameters#include?`
+
+    *Justin Coyne*
+
 ## Rails 5.0.0.beta1 (December 18, 2015) ##
 
 *   Deprecate `redirect_to :back` in favor of `redirect_back`, which accepts a
diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index 957aa746c0..7e2745c75a 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -109,7 +109,7 @@ module ActionController
     cattr_accessor :permit_all_parameters, instance_accessor: false
     cattr_accessor :action_on_unpermitted_parameters, instance_accessor: false
 
-    delegate :keys, :key?, :has_key?, :empty?, :inspect, to: :@parameters
+    delegate :keys, :key?, :has_key?, :empty?, :include?, :inspect, to: :@parameters
 
     # By default, never raise an UnpermittedParameters exception if these
     # params are present. The default includes both 'controller' and 'action'
diff --git a/actionpack/test/controller/parameters/parameters_permit_test.rb b/actionpack/test/controller/parameters/parameters_permit_test.rb
index f23aa599c1..fb72fca789 100644
--- a/actionpack/test/controller/parameters/parameters_permit_test.rb
+++ b/actionpack/test/controller/parameters/parameters_permit_test.rb
@@ -325,4 +325,10 @@ class ParametersPermitTest < ActiveSupport::TestCase
     assert_equal({ 'companies' => [ company, :acme ] }, params.to_unsafe_h)
     assert_not company.dupped
   end
+
+  test "included? returns true when the key is present" do
+    assert @params.include? :person
+    assert @params.include? 'person'
+    assert_not @params.include? :gorilla
+  end
 end