Railscasts＃396不適用於導入Excel工作表

我使用Railscasts創建了用於上傳CSV和Excel文件的功能。導入CSV文件工作良好，但是當我使用瑞安的代碼導入使用Roo的寶石Excel工作表，它拋出一個錯誤：Railscasts＃396不適用於導入Excel工作表

類型錯誤在InventoryItemsController＃進口「不能轉換無成散列」

這裏是在控制器中的導入方法：

def import 
    InventoryItem.import(params[:file]) 
    redirect_to inventory_items_path, notice: "Inventory Items imported successfully!" 
end

我有require 'roo'在application.rb中文件與require 'csv'

在模型中的代碼一起是：

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] 
    inventory_item = InventoryItem.find_by_inventory_id(row["inventory_id"]) || new 
    inventory_item.attributes = row.to_hash #.slice(*accessible_attributes) 
    inventory_item.save! 
    end 
end 

def self.open_spreadsheet(file) 
    binding.pry 
    case File.extname(file.original_filename) 
    when ".csv" then CSV.new(file.path, nil) 
    when ".xls" then Excel.new(file.path, nil) 
    when ".xlsx" then Excelx.new(file.path, nil) 
    else raise "Unknown file type: #{file.original_filename}" 
    end 
end

所以，我卡上的一點是，CSV文件導入成功地與下面的代碼：

def self.import(file) 
    CSV.foreach(file.path, headers: true) do |row| 
     inventory_item = InventoryItem.find_by_inventory_id(row["inventory_id"]) || new 
     inventory_item.attributes = row.to_hash #.slice(*accessible_attributes) 
     inventory_item.save! 
    end 
    end

但它不會從上述（個體經營使用的代碼時工作。用self.open_spreadsheet導入）。

這是使用Roo寶石，我認爲有一些重寫要做的方法，但我不太確定...我堅持要做下一步做什麼。

任何幫助將不勝感激！謝謝！

錯誤的完整的跟蹤：

TypeError (can't convert nil into Hash) 
/Users/marcacyr/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/csv.rb:1565:in `merge' 
/Users/marcacyr/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/csv.rb:1565:in `initialize' 
app/models/inventory_item.rb:27:in `new' 
app/models/inventory_item.rb:27:in `open_spreadsheet' 
app/models/inventory_item.rb:14:in `import' 
app/controllers/inventory_items_controller.rb:85:in `import' 
actionpack (3.0.9) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.0.9) lib/abstract_controller/base.rb:150:in `process_action' 
actionpack (3.0.9) lib/action_controller/metal/rendering.rb:11:in `process_action' 
actionpack (3.0.9) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.0.9) lib/active_support/callbacks.rb:476:in `_run__2908593346646715497__process_action__1677791179652643815__callbacks' 
activesupport (3.0.9) lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks' 
activesupport (3.0.9) lib/active_support/callbacks.rb:94:in `run_callbacks' 
actionpack (3.0.9) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.0.9) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.0.9) lib/active_support/notifications.rb:52:in `block in instrument' 
activesupport (3.0.9) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.0.9) lib/active_support/notifications.rb:52:in `instrument' 
actionpack (3.0.9) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.0.9) lib/action_controller/metal/rescue.rb:17:in `process_action' 
newrelic_rpm (3.6.1.88) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action' 
newrelic_rpm (3.6.1.88) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:318:in `perform_action_with_newrelic_trace' 
newrelic_rpm (3.6.1.88) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action' 
actionpack (3.0.9) lib/abstract_controller/base.rb:119:in `process' 
actionpack (3.0.9) lib/abstract_controller/rendering.rb:41:in `process' 
rack-mini-profiler (0.1.31) Ruby/lib/mini_profiler/profiling_methods.rb:108:in `block in profile_method' 
actionpack (3.0.9) lib/action_controller/metal.rb:138:in `dispatch' 
actionpack (3.0.9) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.0.9) lib/action_controller/metal.rb:178:in `block in action' 
actionpack (3.0.9) lib/action_dispatch/routing/route_set.rb:62:in `call' 
actionpack (3.0.9) lib/action_dispatch/routing/route_set.rb:62:in `dispatch' 
actionpack (3.0.9) lib/action_dispatch/routing/route_set.rb:27:in `call' 
rack-mount (0.6.14) lib/rack/mount/route_set.rb:148:in `block in call' 
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:93:in `block in recognize' 
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:68:in `optimized_each' 
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:92:in `recognize' 
rack-mount (0.6.14) lib/rack/mount/route_set.rb:139:in `call' 
actionpack (3.0.9) lib/action_dispatch/routing/route_set.rb:493:in `call' 
newrelic_rpm (3.6.1.88) lib/new_relic/rack/error_collector.rb:12:in `call' 
newrelic_rpm (3.6.1.88) lib/new_relic/rack/agent_hooks.rb:18:in `call' 
newrelic_rpm (3.6.1.88) lib/new_relic/rack/browser_monitoring.rb:16:in `call' 
newrelic_rpm (3.6.1.88) lib/new_relic/rack/developer_mode.rb:28:in `call' 
meta_request (0.2.7) lib/meta_request/middlewares/app_request_handler.rb:13:in `call' 
rack-contrib (1.1.0) lib/rack/contrib/response_headers.rb:17:in `call' 
meta_request (0.2.7) lib/meta_request/middlewares/headers.rb:16:in `call' 
meta_request (0.2.7) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call' 
meta_request (0.2.7) lib/meta_request/middlewares/request_id.rb:24:in `call' 
bullet (4.6.0) lib/bullet/rack.rb:10:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/head.rb:14:in `call' 
rack (1.2.8) lib/rack/methodoverride.rb:24:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/flash.rb:182:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/cookies.rb:302:in `call' 
activerecord (3.0.9) lib/active_record/query_cache.rb:32:in `block in call' 
activerecord (3.0.9) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache' 
activerecord (3.0.9) lib/active_record/query_cache.rb:12:in `cache' 
activerecord (3.0.9) lib/active_record/query_cache.rb:31:in `call' 
activerecord (3.0.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/callbacks.rb:46:in `block in call' 
activesupport (3.0.9) lib/active_support/callbacks.rb:416:in `_run_call_callbacks' 
actionpack (3.0.9) lib/action_dispatch/middleware/callbacks.rb:44:in `call' 
rack (1.2.8) lib/rack/sendfile.rb:106:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
airbrake (3.1.12) lib/airbrake/rails/middleware.rb:13:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call' 
railties (3.0.9) lib/rails/rack/logger.rb:13:in `call' 
rack (1.2.8) lib/rack/runtime.rb:17:in `call' 
activesupport (3.0.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.2.8) lib/rack/lock.rb:13:in `block in call' 
<internal:prelude>:10:in `synchronize' 
rack (1.2.8) lib/rack/lock.rb:13:in `call' 
actionpack (3.0.9) lib/action_dispatch/middleware/static.rb:30:in `call' 
rack-mini-profiler (0.1.31) Ruby/lib/mini_profiler/profiler.rb:278:in `call' 
airbrake (3.1.12) lib/airbrake/user_informer.rb:16:in `_call' 
airbrake (3.1.12) lib/airbrake/user_informer.rb:12:in `call' 
railties (3.0.9) lib/rails/application.rb:168:in `call' 
railties (3.0.9) lib/rails/application.rb:77:in `method_missing' 
railties (3.0.9) lib/rails/rack/log_tailer.rb:14:in `call' 
rack (1.2.8) lib/rack/content_length.rb:13:in `call' 
rack (1.2.8) lib/rack/handler/webrick.rb:52:in `service' 
/Users/marcacyr/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
/Users/marcacyr/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
/Users/marcacyr/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

來源

2013-10-04 marcacyr

你應該發佈您看到的完整堆棧跟蹤。您沒有給我們提供有關錯誤實際來源的更多信息。 –

編輯幷包含完整的跟蹤 - 謝謝！ – marcacyr

錯誤指向到您嘗試創建一個新的CSV的地方，錯誤是告訴你什麼是錯的。它不能將nil轉換成散列。而不是CSV.new(file.path, nil)你應該做CSV.new(file.path, {})或CSV.new(file.path)。

來源

2013-10-04 21:27:51

對於軌道4和Ruby 2，我有錯誤「500內部服務器錯誤」時遵循Railscast #396

我的解決辦法是現在使用：

Roo::CSV.new(file.path, csv_options: {col_sep: ";"})

，而不是

Csv.new(file.path, nil, :ignore)

來源

2014-05-09 05:41:40

Railscasts＃396不適用於導入Excel工作表

回答

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