Question

我编写了自己的代码，该代码应该在数据库中创建一个新的Performance（模型）条目。我对这应该如何工作缺乏基本的了解，但我不知道要搜索什么。

我将此文件放在我的项目根目录中。当我从命令行运行该文件时，我收到以下错误：

    C:/rubyProjects/dads/fileParser.rb:17:in `<main>': uninitialized constant Performance (NameError)

这是我的代码：

 require 'date'
#require 'Performance'
#require 'performer'

file_name = File.basename("app\assets\documents\Location-2003.11.11-ArtistsName-ArtistName2.txt", ".txt") 
performance_array = file_name.split("-")

location = performance_array[0]
date = performance_array[1]


begin
   date = Date.parse(date)
rescue ArgumentError
   date = Date.parse("31-02-2010")
end

#Need to access Performance here but it fails
performance = Performance.create(file_name: file_name, 
                                      date: date,
                                  location: location)


performance_array.drop(2).each do |performer_name| 
  puts artist_name 
  #save performer in db if doesnt exist
  performer = Performer.find_by_name(performer_name)
  if performer == nil  
  performer = Performer.create(name: performer_name) 
  end

  #create performer to performance relationship
  performance.performers << performer
end

这是我的模型文件\ app \ models \ performance.rb：

class Performance < ActiveRecord::Base
   validates :file_name, presence: true, length: { maximum: 50 },  uniqueness: { case_sensitive: false }
   validates :date, length: { maximum: 30 }  
   validates :location, length: { maximum: 50 }
   has_many :performer_performances, dependent: :destroy  
   has_many :performers, through: :performer_performances

   def has_performer?(performer) 
     performer_performances.find_by(performer_id: performer.id)
   end

   def include! (performer)
     performer_performances.create!(performer_id: performer.id)
   end

end

Answer 1

使用

运行文件

$ rails runner fileParser.rb

Answer 2

rails app中这样的代码的常见做法是将代码放入custom rake task。如果您依赖于以下任务：环境任务，请执行以下操作：

namespace :performance do
  desc 'print all performance file names'
  task :print => :environment do
    Performance.all.each {|perf| puts perf.file_name} 
  end
end

它将允许您使用应用程序的模型层。而且你将能够通过

运行这项任务

rake performance:print

命令。

从Rails中的Ruby文件访问模型？

2 个答案: