我正在努力解决这个错误。我有一个像这样的控制器动作：
def import
InventoryItem.import_list(params[:file], current_vendor.id)
redirect_to vendors_dashboard_path, notice: "Inventory Imported"
end
我的班级方法：
class << self
def import_list(file, vendor_id)
vendor = Vendor.find(vendor_id)
SmarterCSV.process(file.path,
{:key_mapping => { vendor.import_preference.brand_symbol => :brand,
vendor.import_preference.product_symbol => :product,
vendor.import_preference.price_symbol => :price,
vendor.import_preference.upc_symbol => :upc}}) do |row|
params = row.first.merge(:store_id => vendor.stores.first.id)
inventory_item = InventoryItem.create(params)
end
end
handle_asynchronously :import_list
end
当我尝试执行时，我得到未定义的方法错误。此方法可以在不调用handle_asynchronously的情况下工作，当我将其设为普通的self.import类方法时。我在这里做错了什么？
*更新**
错误的服务器日志：
Started POST "/inventory_items/import" for 127.0.0.1 at 2014-10-06 09:30:53 -0700
Processing by InventoryItemsController#import as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "file"=>#<ActionDispatch::Http::UploadedFile:0x000001081d3ab8 @original_filename="Inventory1 - Sheet1.csv", @content_type="text/csv", @headers="Content-Disposition: form-data; name=\"file\"; filename=\"Inventory1 - Sheet1.csv\"\r\nContent-Type: text/csv\r\n", @tempfile=#<Tempfile:/var/folders/6Q/6Qj+aFh4A4orYbGW-nE+++TI/-Tmp-/RackMultipart201406-65416-1dcpxp9>>, "commit"=>"Import"}
Vendor Load (0.9ms) SELECT "vendors".* FROM "vendors" WHERE "vendors"."id" = 25 LIMIT 1
Completed 500 Internal Server Error in 99ms
NoMethodError (undefined method `name' for nil:NilClass):
app/controllers/inventory_items_controller.rb:6:in `import'
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答案 0 :(得分：8)
params[:file]将无法正确编组。而不是将params[:file]对象作为第一个参数传递，而是传递文件路径：
def import
InventoryItem.import_list(params[:file].path, current_vendor.id)
redirect_to vendors_dashboard_path, notice: "Inventory Imported"
end
然后直接在worker方法中使用路径：
class << self
def import_list(path, vendor_id)
vendor = Vendor.find(vendor_id)
SmarterCSV.process(path, {:key_mapping => { vendor.import_preference.brand_symbol => :brand, vendor.import_preference.product_symbol => :product, vendor.import_preference.price_symbol => :price, vendor.import_preference.upc_symbol => :upc}}) do |row|
params = row.first.merge(:store_id => vendor.stores.first.id)
inventory_item = InventoryItem.create(params)
end
end
handle_asynchronously :import_list
end