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-rw-r--r--actionpack/lib/action_controller/metal/strong_parameters.rb20
1 files changed, 18 insertions, 2 deletions
diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index a01110d474..76e3b4d25a 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -430,6 +430,21 @@ module ActionController
)
end
+ if Hash.method_defined?(:dig)
+ # Extracts the nested parameter from the given +keys+ by calling +dig+
+ # at each step. Returns +nil+ if any intermediate step is +nil+.
+ #
+ # params = ActionController::Parameters.new(foo: { bar: { baz: 1 } })
+ # params.dig(:foo, :bar, :baz) # => 1
+ # params.dig(:foo, :zot, :xyz) # => nil
+ #
+ # params2 = ActionController::Parameters.new(foo: [10, 11, 12])
+ # params2.dig(:foo, 1) # => 11
+ def dig(*keys)
+ convert_value_to_parameters(@parameters.dig(*keys))
+ end
+ end
+
# Returns a new <tt>ActionController::Parameters</tt> instance that
# includes only the given +keys+. If the given +keys+
# don't exist, returns an empty hash.
@@ -799,7 +814,8 @@ module ActionController
# end
#
# In order to use <tt>accepts_nested_attributes_for</tt> with Strong \Parameters, you
- # will need to specify which nested attributes should be whitelisted.
+ # will need to specify which nested attributes should be whitelisted. You might want
+ # to allow +:id+ and +:_destroy+, see ActiveRecord::NestedAttributes for more information.
#
# class Person
# has_many :pets
@@ -819,7 +835,7 @@ module ActionController
# # It's mandatory to specify the nested attributes that should be whitelisted.
# # If you use `permit` with just the key that points to the nested attributes hash,
# # it will return an empty hash.
- # params.require(:person).permit(:name, :age, pets_attributes: [ :name, :category ])
+ # params.require(:person).permit(:name, :age, pets_attributes: [ :id, :name, :category ])
# end
# end
#