Rake task NoMethodError: undefined method `task' for main:Object - ruby-on-rails

Question

I have this code which works fine (!!! without the first line "task..."!!!) in console. It creates events in DB. However no luck when running the rake (rake fetch_ttt):
task :fetch_ttt => :environment do
require 'nokogiri'
require 'open-uri'
url = "http://www.example.com"
doc = Nokogiri::HTML(open(url))
doc.css("#eventrow").each do |item|
unless Event.find_by_name(item.at_css("a").text).present?
Event.create(
:start_time => item.at_css("#eventdate").text,
:name => item.at_css("a").text,
:url => item.at_css("a")[:href]
)
end
end
end
This is the trace (not much in dry run neither):
** Invoke fetch_ttt (first_time)
** Invoke environment (first_time)
** Execute (dry run) environment
** Execute (dry run) fetch_ttt
It has been fine couple hours ago. Since then I did a "bundle update", made some DB migrations, edited associations. I tried rolling back migrations and removed model association changes with no luck. I suspect the gems.
Below the 3 gems I rolled back to the previous versions to see if they are responsible but not. And the full diff.
old ones:
gem 'rake', '10.5.0'
gem 'http', '0.9.8'
gem 'ipaddress', '0.8.2'
full diff:
- bcrypt (3.1.10)
+ bcrypt (3.1.11)
- carrierwave (0.10.0)
+ carrierwave (0.11.2)
+ mimemagic (>= 0.3.0)
- concurrent-ruby (1.0.0)
+ concurrent-ruby (1.0.2)
- devise (3.5.6)
+ devise (4.1.1)
- railties (>= 3.2.6, < 5)
+ railties (>= 4.1.0, < 5.1)
- thread_safe (~> 0.1)
- domain_name (0.5.20160128)
+ domain_name (0.5.20160310)
- excon (0.45.4)
+ excon (0.49.0)
- excon (~> 0.45)
+ excon (~> 0.49)
****lots of stuff related to "fog" gem
- http (0.9.8)
+ http (0.9.9)
- ipaddress (0.8.2)
+ ipaddress (0.8.3)
- mime-types (2.99)
- mini_magick (4.4.0)
+ mime-types (2.99.1)
+ mimemagic (0.3.1)
+ mini_magick (4.5.1)
mini_portile2 (2.0.0)
- minitest (5.8.4)
- multi_json (1.11.2)
+ minitest (5.9.0)
+ multi_json (1.12.0)
- rails_stdout_logging (0.0.4)
+ rails_stdout_logging (0.0.5)
- responders (2.1.1)
+ responders (2.2.0)
- sprockets (3.5.2)
+ sprockets (3.6.0)
- sprockets-rails (3.0.1)
+ sprockets-rails (3.0.4)
- tilt (2.0.2)
+ tilt (2.0.4)
Rails 4.2.5, Ruby 2.1.4, I am on C9 IDE. But doesn't work on heroku neither.
UPDATE
reverted back to rake 10.5.0 (and did grep rake Gemfile.lock) now in the console I only get:
<Rake::Task fetch_ttt => [environment]>
scraping doesn't run at all :(

Answer 1

I don't think there's enough info here to give a definitive answer, but I would start by investigating the root cause for why it isn't working on heroku.
For example, does the rake task run at all? How do you know?
If so, do heroku run rails c and try doing the sequence of code yourself. Inspect the database records before and after you expect a chance. What happened?
If it didn't run, what type of output did you get? heroku logs can also be helpful.
One other little tip, it's possible to use byebug with heroku logs -t. Although I only recommend this in your staging environment and only if you're willing to clean up the git history afterwards.
In short, my answer is I would solve it by debugging more directly. Hope this helps.

Answer 2

outcommented
#require 'nokogiri'
#require 'open-uri'
and now it works. Even with rake 11.1.2