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我正在關注如何導入csv文件的this railcast。導入csv文件時,#<Class:0xa874498> Rails 4未定義方法`導入'
我的CSV文件名爲stg_pound.csv,並具有以下內容:
"FOREX RATES FOR DATES BETWEEN 2003-5-1 AND 2014-5-28, STG POUND",,,,
Date,Currency,Buy,Sell,Mean
01/01/03,STG POUND,147.5117,147.7939,147.653
01/02/03,STG POUND,147.837,148.1767,148.007
01/03/03,STG POUND,147.8006,148.1422,147.971
01/04/03,STG POUND,148.0311,148.3722,148.202
我的應用程序的設置如下:
我的外匯index.html.erb:
<%= form_tag import_forexes_path, multipart: true do %>
<%= file_field_tag :file %>
<%= submit_tag "Import" %>
<% end %>
forexes_controller.rb
def import
Forex.import(params[:file])
redirect_to root_url, notice: "Imported"
end
forex.rb
# == Schema Information
#
# Table name: forexes
#
# id :integer not null, primary key
# published_at :datetime
# currency :string(255)
# buy :float
# sell :float
# mean :float
# created_at :datetime
# updated_at :datetime
#
def import
CSV.foreach(file.path, headers: true) do |row|
Forex.create! row.to_hash
end
end
的routes.rb
resources :forexes do
collection { post :import}
end
application.rb中
require 'csv'
當我嘗試導入stg_pound.csv文件我得到以下錯誤:
undefined method `import' for #<Class:0xab2c6cc>
從forex_controller.rb文件中的以下行強調:
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"mGm6jN7uvoRVjVbSDE/vpprIQnpjiL60s4rETHT9mPA=",
"file"=>#<ActionDispatch::Http::UploadedFile:0xaa974dc @tempfile=#<Tempfile:/tmp/RackMultipart20140530-4261-z8fb9x>,
@original_filename="stg_pound.csv",
@content_type="text/csv",
@headers="Content-Disposition: form-data; name=\"file\"; filename=\"stg_pound.csv\"\r\nContent-Type: text/csv\r\n">,
"commit"=>"Import"}
:
Forex.import(params[:file])
不過,我可以看到該文件,因爲我看到下面的錯誤頁面已經被拾取
起初我以爲這是因爲:文件沒有被包含在strong_parameters中,所以我繼續並在forex_controller強參數中包括以下內容,但它不起作用
def forex_params
params.require(:forex).permit(:published_at, :currency, :buy, :sell, :mean, :file)
end
給你'進口method'在你的模型像這樣'self.import(文件)' – Pavan
工作,但爲什麼它不是如果我不帶自前綴我的模型方法及其在軌道4,5工作? – Mutuma
檢查@ Matt的回答! – Pavan