带有 rails4 的 Roo 为 nil:NilClass 提供未定义的方法 `[]' [英] Roo with rails4 giving undefined method `[]' for nil:NilClass

问题描述

我正在尝试使用基于 http://railscasts.com/episodes/396-importing-csv-and-excel.

I'm trying to import CSV and Excel files into a rails 4 project (with validation) using the Roo gem, based on http://railscasts.com/episodes/396-importing-csv-and-excel.

我对 Rails4 而不是 Rails3 进行了一些更改，并对 Roo 进行了更改，现在我的 ProjectImporter 模型如下所示:

I've made some changes to account for Rails4 instead of Rails3 and for changes to Roo, and my ProjectImporter model now looks like:

class ProductImport
  include ActiveModel::Model
  attr_accessor :file

  def initialize(attributes = {})
    attributes.each { |name, value| send("#{name}=", value) }
  end

  def persisted?
    false
  end

  def save
    if imported_products.map(&:valid?).all?
      imported_products.each(&:save!)
      true
    else
      imported_products.each_with_index do |product, index|
        product.errors.full_messages.each do |message|
          errors.add :base, "Row #{index + 2}: #{message}"
        end
      end
      false
    end
  end

  def imported_products
    @imported_products ||= load_imported_products
  end

  def load_imported_products
    spreadsheet = open_spreadsheet
    spreadsheet.default_sheet = spreadsheet.sheets.first
    puts "!!! Spreadsheet: #{spreadsheet}"
    header = spreadsheet.row(1)
    (2..spreadsheet.last_row).map do |i|
      row = Hash[[header, spreadsheet.row(i)].transpose]
      product = Product.find_by(id: row['id']) || Product.new
      product.attributes = row.to_hash.slice(*['name', 'released_on', 'price'])
      product
    end
  end

  def open_spreadsheet
    case File.extname(file.original_filename)
      when ".csv" then
        Roo::CSV.new(file.path, nil)
      when '.tsv' then
        Roo::CSV.new(file.path, csv_options: { col_sep: "\t" })
      when '.xls' then
        Roo::Excel.new(file.path, nil, :ignore)
      when '.xlsx' then
        Roo::Excelx.new(file.path, nil, :ignore)
      when '.ods' then
        Roo::OpenOffice.new(file.path, nil, :ignore)
      else
        raise "Unknown file type #{file.original_filename}"
    end
  end
end

当我尝试运行导入(使用测试 CSV 数据)时，它在 header =电子表格.row(1) 上失败，错误 undefined method '[]' for nil:NilClass.我包含的额外的 puts 语句证实了 spreadsheet 本身不是 nil:它给出了 ！！！电子表格:#.但是，如果我尝试对其调用几乎所有预期的方法，例如 #last_row，则会出现相同的未定义方法错误.

When I try to run an import (using test CSV data), it fails on header = spreadsheet.row(1) with the error undefined method '[]' for nil:NilClass. The extra puts statement I've included confirms that spreadsheet itself isn't nil: it gives !!! Spreadsheet: #<Roo::CSV:0x44c2c98>. But if I try to call almost any of the expected methods on it, such as #last_row, it gives me the same undefined method error.

那我做错了什么?

推荐答案

我也遇到了同样的问题，好像是文件编码的问题，我用了这段代码，解决了.

I had the same problem, it seems a problem about file enconding, I used this code and it was fixed.

def open_spreadsheet
    case File.extname(file.original_filename)
        when ".csv" then Roo::CSV.new(file.path, csv_options: {encoding: "iso-8859-1:utf-8"})
        when ".xls" then Roo::Excel.new(file.path, nil, :ignore)
        when ".xlsx" then Roo::Excelx.new(file.path, nil, :ignore)
        else raise "Unknown file type: #{file.original_filename}"           
    end 
end

希望对你有帮助.

这篇关于带有 rails4 的 Roo 为 nil:NilClass 提供未定义的方法 `[]'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！