Rails 4如何从Model调用accessible_attributes

Question

嗨我在Rails演员(导入csv Excel文件)上尝试这个tuto .我在这条线上有错误product.attributes = row.to_hash.slice(*accessible_attributes)

undefined local variable or method##的accessible_attributes'

这是我的模特.

class Product < ActiveRecord::Base
  require 'roo'
  validates_presence_of :price
  #attr_accessible :name, :price, :released_on #I removed this line (rails 4)


  def self.to_csv(options = {})
    CSV.generate(options) do |csv|
      csv << column_names
      all.each do |product|
        csv << product.attributes.values_at(*column_names)
      end
    end
  end

  def self.import(file)
    spreadsheet = open_spreadsheet(file)
    header = spreadsheet.row(1)
    (2..spreadsheet.last_row).each do |i|
      row = Hash[[header, spreadsheet.row(i)].transpose]
      product = find_by_id(row["id"]) || new
      product.attributes = row.to_hash.slice(*accessible_attributes)
      product.save!
    end
  end

  def self.open_spreadsheet(file)
    case File.extname(file.original_filename)
    when ".csv" then Roo::Csv.new(file.path)
    when ".xls" then Roo::Csv.new(file.path)
    when ".xlsx" then Roo::Csv.new(file.path)
    else raise "Unknown file type: #{file.original_filename}"
    end
  end
end

在我的控制器上结束我定义了product_params

def product_params
    params.require(:product).permit(:name, :price, :released_on)
  end

我想要导入的我的csv看起来像这样:

id,name,realased_on,price,created_at,updated_at
1,Acoustic Guitar,2012-10-03,3456.54,2013-12-09 00:00:23 UTC, 2012-12-08 23:45:46 UTC

Answer 1

在Rails 4.1下处理这个Railscast时,我通过用row.to_hash.keys替换accessible_attributes来获得工作方法.

def self.import(file)
   spreadsheet = open_spreadsheet(file)
    header = spreadsheet.row(1)
    (2..spreadsheet.last_row).each do |i|
      row = Hash[[header, spreadsheet.row(i)].transpose]
      product = find_by_id(row["id"]) || new
      product.attributes = row.to_hash.slice(*row.to_hash.keys)
      product.save!
    end
end

Answer 2

实际上accessible_attributes获取attr_accessible在模型中声明的列但是在rails 4中他们已经删除了attr_accessiblefrom模型并使用了strong_parameter而不是那样,因此accessible_attributes在他的模型中创建一个同名的方法然后在该方法内部声明了你想要的列数组.如:

def accessible_attributes
 [col1_name, col2_name, ....]
end