【发布时间】：2013-09-29 17:24:00
【问题描述】：
我正在编写一个 Ruby on Rails 应用程序，它有一个可以解析 CSV 文件的 Rake 任务。
代码如下：
desc "Import Channels into DB\n Usage: rake channel_import"
task :import_channels, :path_to_channel_list do |t, args|
require "#{Rails.root}/app/models/channel"
require "csv"
filePath = args.path_to_channel_list
puts "Filepath received = #{filePath}"
csv = CSV.read("#{filePath}", :encoding => 'windows-1251:utf-8')
csv.each_with_index do |row, i|
if [0].include?(i)
puts "Skipping over row #{i}"
next
end
if(row.nil?)
puts "row[#{i}] was nil"
else
channelName = nil
classif = nil
owner = nil
channelName = row[0].force_encoding('UTF-8')
classif = row[1].force_encoding('UTF-8')
owner = row[2].force_encoding('UTF-8')
if (channelName.nil?)
puts "Channel name for row #{i} was nil"
#add entry to Log file or errors database
next #skip this row of the csv file and go to next row
else
channel_hash = Hash.new("name" =>"#{channelName}", "classification" => "#{classif}", "owner" => "#{owner}" )
end
puts "\nChannel Name = #{channelName}\nClassification = #{classif}\n Ownership = #{owner}"
#If channel name exists in the Database, update it
xisting_channel = nil
xisting_channel = Channel.find_by channel_name: '#{channelName}'
if(xisting_channel.nil?)
#create a new channel
@new_channel = Channel.create(channel_hash)
puts "Inserted....#{@new_channel.inspect}"
else
#update existing channel
Channel.update(xisting_channel.id, :classification => "#{classif}", :ownership => "#{owner}" )
puts "Updated...."
puts "channel_hash = #{channel_hash.inspect} "
end#end if/else
end#end if/else
end #end CSV.each
end
当我运行此代码时，我收到以下错误消息：
MRMIOMP0903:am AM$ rake import_channels[/XXXXXXXX/Channellist.csv]
Filepath received = /XXXXXXX/Channellist.csv
Skipping over row 0
Channel Name = APTN HD+
Classification = Specialty
Ownership = Aboriginal Peoples Television Network
rake aborted!
ActiveRecord::ConnectionNotEstablished
我尝试使用 IRB 创建一个 Channel 对象，它工作得很好。数据库已创建，我正在使用 MySQL WorkBench 看到它。所有表都在那里，但是，我无法从 Rake 任务创建 Channel 对象。
我的假设是，可能在某个文件夹/层次结构之外，应用程序无法访问 ActiveRecord::Base 类或类似的东西。
关于如何进行这项工作的任何建议？
更新：
根据 Phillip Hallstrom 的回答
我更改了顶行以加载环境
task :import_channels => :environment do|t, args|
然后尝试 rake import_channels 并得到这个错误：
rake aborted!
undefined method `safe_constantize' for #<Hash:0x007fbeacd89920>
【问题讨论】：
标签： ruby-on-rails ruby activerecord connection rake