更新阵列具有很强的参数轨道4

Question

我收到JSON对象和嵌套阵列经由轨道4的API使用参数，如下所示：

{ 
    "token" => "123" 
    "lessons" => [ 
    { 
     "token_id" => "j12l3n123", 
     "attr_1" => "hello", 
     "attr_2" = "is it me you're looking for" 
    }, 
    { 
     "token_id" => "j12l", 
     "attr_1" => "Nope", 
     "attr_3" = "You're not." 
    } 
    ] 
} 

和我有一个控制器，像这样：

def update_all 
    #fetch collection with one db hit 
    token_ids = params[:lessons].map{|l| l[:token_id]} 
    @lessons = Lesson.where(token_id: token_ids) 

    params[:lessons].each do |l| 
     lesson = @lessons.detect { |lesson| lesson.token_id == l[:token_id] } 
     # How do I update the record with strong params? 
     lesson.update_attributes(lesson_params) 
    end 
end 

private 

def lesson_params 
    params.permit(
    :attr_1, 
    :attr_2, 
    :attr_3 
    ) 
end 

我如何使用数组中的正确对象更新每条记录，并使用强参数来执行此操作？

Answer 1

def update_all 
    lesson_params.each do |l| 
     lesson = Lesson.where(token_id: l[:token_id]).first 
     lesson.update_attributes(l) 
    end 
end 

private 

def lesson_params 
    params.require(:lessons).map do |l| 
     ActionController::Parameters.new(l.to_hash).permit(
      :attr_1, 
      :attr_2, 
      :attr_3 
     ) 
    end 
end 

Answer 2

def lesson_params params.permit(:token, lessons: [:token_id, :attr_1, :attr_2, :attr_3 ]) end

在控制器东西

像下面

def update_all lesson_params[:lessons].each do |lesson_param| lesson = Lesson.find(lesson_param[:token_id]) lesson.update_attributes(lesson_param) end end