Rails permit params 接受Hash,Array

 

describe 'nested attributes on articles (which has_many comments)' do
  before do
    @hash = {
      "article" => {
        "title" => "Test",
        "body" => "test body",
        "comments_attributes" => {
          '0'=>{"author" => "John", "content" => "great"},
          '1'=>{"author" => "Mary", "content" => "awful"}
        }
      }
    }
    @params = ActionController::Parameters.new @hash
  end
  it 'shows how to permit nested parameters' do
    attributes = @params.
      require(:article).
      permit(:title, comments_attributes: [:author,
                                :content])[:comments_attributes].
        must_equal @hash['article']['comments_attributes']
  end
end

http://www.carreno.me/articles/understanding-strong-parameters-in-rails-4