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我有一个应用程序,我想在其上提供从 CSV 和 Excel 文件格式导入记录的功能。我正在使用 roo gem,但在导入时它给出了错误“nil:NilClass 的未定义方法 `[]'”。

这是代码:

学生.rb:

require 'roo'
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, nil, :ignore)
  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

学生控制器.rb:

def import
    Student.import(params[:file])
    redirect_to students_path, notice: "Record imported Successfully."
  end

新的.html.erb:

<%= form_tag import_students_path, multipart: true do %>
        <%= file_field_tag :file , :required=> true%> <br/>
        <%= submit_tag "Import" , :class => "btn btn-primary btn-block" %>
<% end %>

告诉我我做错了什么?

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0 回答 0