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この設定でこのエラーが発生しています。私の考えは、ファイルがCSVに正しくアクセスできないということです。私は輸入しようとしています。モデル日付を使用して別のCSVを作成するには、あるCSVからインポートする必要があります。新しいcsv /操作データを表示するには、コントローラーとビューに何を挿入しますか？基本的には、モデルのコード（order.csv）と別のcsvファイル（redemption.csv）に1つのCSVファイルを渡すことができます。モデル内のコードはorders.csv内の既存の数値を特定の方法で計算するこの引数を指定しないでエクスポートするとエラー？引数の数が間違っています（0、予想される4）
コントローラ（私は本当にここに何をすべきか分からない）
class OrdersController < ApplicationController
def index
orders = Order.new
end
def redemptions
orders = Order.new
end
end
ビュー（どちらかこのことについて自信がない）
<h1>Chocolates</h1>
puts "#{order.purchased_chocolate_count}"
<%= link_to "CSV", orders_redemptions_path, :format => :csv %>
モデル
require 'csv'
# Define an Order class to make it easier to store/calculate chocolate tallies
class Order < ActiveRecord::Base
module ChocolateTypes
MILK = 'milk'
DARK = 'dark'
WHITE = 'white'
SUGARFREE = 'sugar free'
end
BonusChocolateTypes = {
ChocolateTypes::MILK => [ChocolateTypes::MILK, ChocolateTypes::SUGARFREE],
ChocolateTypes::DARK => [ChocolateTypes::DARK],
ChocolateTypes::WHITE => [ChocolateTypes::WHITE, ChocolateTypes::SUGARFREE],
ChocolateTypes::SUGARFREE => [ChocolateTypes::SUGARFREE, ChocolateTypes::DARK]
}
# Ruby has this wacky thing called attr_reader that defines the available
# operations that can be performed on class member variables from outside:
attr_reader :order_value
attr_reader :chocolate_price
attr_reader :required_wrapper_count
attr_reader :order_chocolate_type
attr_reader :chocolate_counts
def initialize(order_value, chocolate_price, required_wrapper_count, order_chocolate_type)
@order_value = order_value
@chocolate_price = chocolate_price
@required_wrapper_count = required_wrapper_count
@order_chocolate_type = order_chocolate_type
# Initialize a new hash to store the chocolate counts by chocolate type.
# Set the default value for each chocolate type to 0
@chocolate_counts = Hash.new(0);
process
end
# Return the number of chocolates purchased
def purchased_chocolate_count
# In Ruby, division of two integer values returns an integer value,
# so you don't have to floor the result explicitly
order_value/chocolate_price
end
# Return the number of chocolate bonuses to award (which can include
# multiple different chocolate types; see BonusChocolateTypes above)
def bonus_chocolate_count
(purchased_chocolate_count/required_wrapper_count).to_i
end
# Process the order:
# 1. Add chocolate counts to the totals hash for the specified order type
# 2. Add the bonus chocolate types awarded for this order
def process
chocolate_counts[order_chocolate_type] += purchased_chocolate_count
bonus_chocolate_count.times do |i|
BonusChocolateTypes[order_chocolate_type].each do |bonus_chocolate_type|
chocolate_counts[bonus_chocolate_type] += 1
end
end
end
# Output the chocolate counts (including bonuses) for the order as an array
# of strings suitable for piping to an output CSV
def csv_data
ChocolateTypes.constants.map do |output_chocolate_type|
# Get the display string (lowercase)
chocolate_key = ChocolateTypes.const_get(output_chocolate_type)
chocolate_count = chocolate_counts[chocolate_key].to_i
"#{chocolate_key} #{chocolate_count}"
end
end
end
# Create a file handle to the output file
CSV.open("redemptions.csv", "wb") do |redemption_csv|
# Read in the input file and store it as an array of lines
input_lines = CSV.read("orders.csv")
# Remove the first line from the input file (it just contains the CSV headers)
input_lines.shift()
input_lines.each do |input_line|
order_value, chocolate_price, required_wrapper_count, chocolate_type = input_line
# Correct the input values to the correct types
order_value = order_value.to_f
chocolate_price = chocolate_price.to_f
required_wrapper_count = required_wrapper_count.to_i
# Sanitize the chocolate type from the input line so that it doesn't
# include any quotes or leading/trailing whitespace
chocolate_type = chocolate_type.gsub(/[']/, '').strip
order = Order.new(order_value, chocolate_price, required_wrapper_count, chocolate_type)
order.process()
puts order.purchased_chocolate_count
# Append the order to the output file as a new CSV line
output_csv << order.csv_data
end
end