如何通過'roo'gem導入csv文件？

Question

請幫忙導入csv文件。

我安裝gem'roo'和gem'iconv'。我做支架產品河畔形式導入文件：

<%= form_tag import_products_path, multipart: true do %> 
    <%= file_field_tag :file %> 
    <%= submit_tag "Import" %> 
<% end %> 

的config/routes.rb中

resources :products do 
    collection { post :import } 
end 

products_controller.rb

def import 
    Product.import(params[:file]) 
    redirect_to root_url, notice: "Products imported." 
end 

型號/ product.rb

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 Csv.new(file.path, nil, :ignore) 
    when ".xls" then Excel.new(file.path, nil, :ignore) 
    when ".xlsx" then Excelx.new(file.path, nil, :ignore) 
    else raise "Unknown file type: #{file.original_filename}" 
    end 
end 

我使用這個受歡迎的教程：http://railscasts.com/episodes/396-importing-csv-and-excel?autoplay=true

但之後通過形式加載CSV文件，瀏覽器顯示如下：

NameError in ProductsController#import 
uninitialized constant Csv 

和控制檯顯示的跟隨誤差

message:#<ActionDispatch::Http::UploadedFile:0x000000060f36a0 @tempfile=#<Tempfile:/tmp/RackMultipart20151015-18667-14nvfde.csv>, @original_filename="products (2).csv", @content_type="text/csv", @headers="Content-Disposition: form-data; name=\"file\"; filename=\"products (2).csv\"\r\nContent-Type: text/csv\r\n"> 
Completed 500 Internal Server Error in 12ms (ActiveRecord: 0.0ms) 

NameError (uninitialized constant Csv): 
    app/models/product.rb:25:in `open_spreadsheet' 
    app/models/product.rb:11:in `import' 
    app/controllers/products_controller.rb:82:in `import' 

我嘗試在型號替換：

when ".csv" then Csv.new(file.path, nil, :ignore) 

在

when '.csv' then Roo::Csv.new(file.path, nil, :ignore) 

但問題沒有解決。

在這個話題中，我問Suraj關於調整，但沒有收到任何迴應。

請幫助impoer CSV文件

Answer 1

變化Csv.new到CSV.new是什麼做的，經過這個錯誤嗎？

http://ruby-doc.org/stdlib-1.9.2/libdoc/csv/rdoc/CSV.html#method-c-new

更新

而不是做：

def self.import(file) 
    spreadsheet = open_spreadsheet(file) 
    header = spreadsheet.row(1) 

嘗試這樣做：

def self.import(file) 
    spreadsheet = Roo::Spreadsheet.open('./name_of_file') 
    header = spreadsheet.row(1)