Creating a task in ruby on rails - ruby-on-rails

Question

I want to create a CRON task for daily report. I need guidance where to create my class in my project (in which folder). How to instantiate an object from rails console for the same class. Will that class inherit application controller? I would also like to know since i will be querying my database so would my models be directly accessible in this file or somehow i have to include them like we do in django?
I have created a class /lib/tasks/daily_report.rb. But i am unable to understand how will i use that file to create a task.
module Reports
class Report
class << self
def collect_data
row_data = []
headers = ["Mobile", "Buildings", "Owners", "Tenants", "Members", "Total People"]
row_data.push(*headers)
puts "in side collect data"
date = Date.today.to_s
mobile = ["mobiles"]
for i in mobile do
row = []
row << i
build_count = Buildings.where(created_at: date, added_by: i).count
row << build_count
puts "build_count"
owners_count = Residents.where(created_at: date, added_by: i, role: "owner").count
row << owners_count
puts "owners_count"
tenants_count = Residents.where(created_at: date, added_by: i, role: "tenant").count
row << tenants_count
members_count = MemeberRelations.where(created_at: date, added_by: i).count
row << members_count
total_people = owners_count + tenants_count + members_count
row << total_people
row_data << row
end
puts row_data
return row_data
end
def generate_csv()
puts "walk away"
row_data = self.collect_data
CSV.open('/home/rajdeep/police-api/daily_report.csv', 'w') do |csv|
row_data.each { |ar| csv << ar }
end
end
end
end
end

Answer 1

If you wish to manage cron tasks from Rails, try whenever gem.
Add it to your Gemfile,
Gemfile
gem 'whenever', require: false
Run initialize task from root of your app
$ bundle exec wheneverize .
This will create an initial config/schedule.rb file for you (as long
as the config folder is already present in your project)
(from the gem docs).
After that in config/schedule.rb set proper parameters of call time. For example
config/schedule.rb
every :hour do # Many shortcuts available: :hour, :day, :month, :year, :reboot
runner "Report.generate_csv"
end
More syntax options of schedule.rb here
UPDATE AFTER COMMENTS
Hope, you're under Rails context yet. Create file in public folder at application root path.
result_file = "#{Rails.root}/public/cards-excluded.csv"
CSV.open(result_file, 'w') do |csv|
row_data.each { |ar| csv << ar }
end
ANOTHER UPDATE LATER
Okay, although this is not relevant to the original question, let's try to solve your problem.
We'll proceed from what you have Rails application, not custom Ruby library.
First, create module at your_rals_app/lib/reports.rb file
module Reports
class Report
class << self
def collect_data
# your current code and line below, explicit return
return row_data
end
def generate_csv
row_data = collect_data # btw unnecessary assignment
CSV.open('/home/rajdeep/police-api/daily_report.csv', 'w') do |csv|
row_data.each { |ar| csv << ar }
end
end
end
end
end
Second, make sure, that you have lib files at autoload path. Check it in you config/application.rb
config.autoload_paths += %W(#{config.root}/lib/*)
Thirdly, use Reports module such way (> means that you're at rails console, rails c)
> Reports::Report.generate_csv