1 files changed, 4 insertions, 4 deletions
diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index 7f5144bc49..d62e01d185 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -32,13 +32,13 @@ module ActionController
   #
   #   params = ActionController::Parameters.new(a: "123", b: "456")
   #   params.permit(:c)
-  #   # => ActionController::UnpermittedParameters: found unpermitted parameters: a, b
+  #   # => ActionController::UnpermittedParameters: found unpermitted parameters: :a, :b
   class UnpermittedParameters < IndexError
     attr_reader :params # :nodoc:
 
     def initialize(params) # :nodoc:
       @params = params
-      super("found unpermitted parameter#{'s' if params.size > 1 }: #{params.join(", ")}")
+      super("found unpermitted parameter#{'s' if params.size > 1 }: #{params.map { |e| ":#{e}" }.join(", ")}")
     end
   end
 
@@ -750,7 +750,7 @@ module ActionController
       ]
 
       def permitted_scalar?(value)
-        PERMITTED_SCALAR_TYPES.any? {|type| value.is_a?(type)}
+        PERMITTED_SCALAR_TYPES.any? { |type| value.is_a?(type) }
       end
 
       def permitted_scalar_filter(params, key)
@@ -766,7 +766,7 @@ module ActionController
       end
 
       def array_of_permitted_scalars?(value)
-        if value.is_a?(Array) && value.all? {|element| permitted_scalar?(element)}
+        if value.is_a?(Array) && value.all? { |element| permitted_scalar?(element) }
           yield value
         end
       end