Question

我想导入学生记录，但是当我选择文件时，它会显示错误 NoMethodError in ReportsController#import undefined method original_filename＆＃39; for＆＃34; students.xlsx＆＃34;：String`

我尝试了这个，我得到了

[1] pry(#<ReportsController>)> Student.import(params[:file]) NoMethodError: undefined method original_filename＆＃39; for＆＃34; import.xlsx＆＃34;：String 来自/home/dk/import_multiple/school/app/models/student.rb:283:in open_spreadsheet'

这是我的代码：

控制器

def importer      
  params[:role] == :guardian ? Guardian : Student
end

def import
  importer.import(params[:file])
  redirect_to import_reports_path, notice: "Students imported."
end

student.rb

COLUMNS_TO_STRING = ["batch_id", "class_roll_no","phone1","phone2"]  # and so on
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]
  row = clean_for row, COLUMNS_TO_STRING
  record = Student.find_by(:id => row["id"],:batch_id =>    row["batch_id"],:class_roll_no => row["class_roll_no"],:phone1 =>  row["phone1"],:phone2 => row["phone2"]) || new
  record.attributes = row.to_hash.slice(*row.to_hash.keys)
  record.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::Excel.new(file.path)
  when ".xlsx" then Roo::Excelx.new(file.path)
  else raise "Unknown file type: #{file.original_filename}"
  end
 end

guardian.rb

COLUMNS_TO_STRING = ["student_id"] # and so on
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]
  row = clean_for row, COLUMNS_TO_STRING
  guardian = Guardian.find_by(:id => row["id"],:student_id => row["student_id"]) || new
  guardian.attributes = row.to_hash.slice(*row.to_hash.keys)
  guardian.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::Excel.new(file.path)
  when ".xlsx" then Roo::Excelx.new(file.path)
  else raise "Unknown file type: #{file.original_filename}"
  end
 end

查看

<h1>IMPORT</h1>
<div class = "well">
    <p>
        <%= form_tag import_reports_path do %>
        <%= file_field_tag :file%>
        <br>
        <%= submit_tag "Import",class: "btn btn-primary" %>
        <% end %>
    </p> 
</div>

Answer 1

您的form_tag需要知道其中有多部分文件上传字段 - 否则它将提交原始数据，而不是实际上传文件。

form_tag import_reports_path, multipart: true do

Answer 2

看起来open_spreadsheet需要一个文件对象，而不是一个字符串

ReportsController中的NoMethodError #import undefined方法`original_filename＆＃39; for＆＃34; students.xlsx＆＃34;：String

2 个答案: