array_filter?(filter) — ActionController::Parameters

array_filter?(filter)

When an array is expected, you must specify an array explicitly using the following format:

params.expect(comments: [[:flavor]])

Which will match only the following array formats:

{ pies: [{ flavor: "rhubarb" }, { flavor: "apple" }] }
{ pies: { "0" => { flavor: "key lime" }, "1" =>  { flavor: "mince" } } }

When using permit, arrays are specified the same way as hashes:

params.expect(pies: [:flavor])

In this case, permit would also allow matching with a hash (or vice versa):

{ pies: { flavor: "cherry" } }

Parameters

filter req

Source

# File actionpack/lib/action_controller/metal/strong_parameters.rb, line 1256
      def array_filter?(filter)
        filter.is_a?(Array) && filter.size == 1 && filter.first.is_a?(Array)
      end

Defined in actionpack/lib/action_controller/metal/strong_parameters.rb line 1256 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActionController::Parameters

Signature

Parameters