[英]Rails don't know how to build task
I am attempting to scrape data from a website. 我正在尝试从网站上抓取数据。 I am running rake from index.html.erb 我正在从index.html.erb运行rake
<% Article.run_rake("fetch_games") %>
I have it defined in a .rb file. 我在.rb文件中定义了它。 Here is article.rb 这是article.rb
require 'rake'
require 'rubygems'
#load './lib/tasks/article_task.rake'
class Article < ActiveRecord::Base
def self.run_rake(fetch_games)
Rails.root + "lib/tasks/article_task.rake"
Rake::Task["fetch_games"].invoke
end
end
And here is the rakefile itself: article_task.rake 这是rakefile本身:article_task.rake
desc "Fetch Games"
task :fetch_games => :environment do
require 'nokogiri'
require 'open-uri'
url = "http://espn.go.com/nba/schedule"
data = Nokogiri::HTML(open(url))
games = data.css('.responsive-table-wrap')
games.each do |game|
#check for a listing
if !game.at_css("caption").nil?
#Date
puts game.at_css("caption").text
else
puts "No Listing"
end
#check for the team name
if !game.at_css(".team-name").nil?
#Team name
puts game.at_css(".team-name").text
else
puts "No Games Scheduled"
end
#empty
puts ""
end
end
When I run this from the terminal it pulls what I need. 当我从终端运行它时,它会拉出我需要的东西。 But when I try to run it through rails server it gives me this error: 但是,当我尝试通过Rails服务器运行它时,出现了以下错误消息:
What am I doing wrong? 我究竟做错了什么? New to ruby/rails btw 红宝石/铁轨新手
We need to load_tasks before you run that. 在运行之前,我们需要先load_tasks。 You comment out that line - 您注释掉该行-
load './lib/tasks/article_task.rake'
Do this - 做这个 -
require 'rake'
require 'rubygems'
load './lib/tasks/article_task.rake'
class Article < ActiveRecord::Base
def self.run_rake(fetch_games)
Rake::Task["fetch_games"].invoke
end
end
Rather than go through the contortions needed to load up an invoke a Rake task, you could move the code into a separate unit and load it in the model (and the Rake task, if you need it). 您可以将代码移到一个单独的单元中,然后将其加载到模型中(如果需要,也可以将其加载到Rake任务中),而不是通过加载调用Rake任务所需的扭曲。
module GameFetcher
def fetch
...
end
end
class Article < ActiveRecord::Base
extend GameFetcher
...
end
Article.fetch
This also makes it easier to write a unit test for the fetch
logic. 这也使得为fetch
逻辑编写单元测试变得更加容易。
I went in another direction from the rake file. 我从rake文件转向了另一个方向。 I defined it in articles controller and called it in index.html.erb
. 我在文章控制器中定义了它,并在index.html.erb
中将其称为。 It now displays in the rails server. 现在,它显示在rails服务器中。
articles_controller.rb article_controller.rb
require 'nokogiri'
require 'open-uri'
def index
url = "http://espn.go.com/nba/schedule"
data = Nokogiri::HTML(open(url))
@games = data.css('.responsive-table-wrap')
end
index.html.erb index.html.erb
<% @games.each do |game| %>
<% if !game.at_css("caption").nil? %>
<%= game.at_css("caption").text %>
<% else %>
<%= 'No Games Sheduled' %>
<% end %>
<% end %>
I think this thread can help: Run rake task in controller 我认为此线程可以帮助您: 在控制器中运行rake任务
Apparently, you have to call something like that before you call your task: 显然,在调用任务之前,您必须调用类似的名称:
NameOfYourApp::Application.load_tasks
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