Miguel Ricardo Gomez MiguelArgentina

Lock the DB for updating info:

ActiveRecord::Base.transaction do
  ActiveRecord::Base.connection.execute('LOCK scheduling_informations IN ACCESS EXCLUSIVE MODE')
  SchedulingInformation.delete_all
end

Heroku related

Heroku log tails:

heroku logs --app app-name --tail
heroku logs --app app-name -n 1500 (for the last 1500 lines)
heroku logs --app app-name --tail --ps worker (worker logs)

Heroku DB dump:

heroku pg:backups:capture -a app-name (create the dump)
heroku pg:backups:download -a app-name (download the dump)

Cheat Sheets are greate but they are not a substitute for learning the framework and reading the documentation as we most certainly have not covered every potential example here. Please refer to the Rails Command Line Docs for more information.

Command Line Generator Info

Reference

You can get all of this information on the command line.

rails generate with no generator name will output a list of all available generators and some information about global options. rails generate GENERATOR --help will list the options that can be passed to the specified generator.

This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

	require "csv"

	class CsvFileHandler
	# Reads specific columns or all columns from a CSV file.
	# column_indices is an array of integers representing the column numbers to read.
	# If column_indices is empty or not provided, all columns are read.
	BATCH_SIZE = 1000
	def self.read_from_csv(file_path, column_indices = [], separator = ",")
	data = []
	CSV.foreach(file_path, headers: true, header_converters: :symbol, col_sep: separator) do \|row\|

	# This module must be included in controllers
	# to get the functionality of the methods.
	# Remember to call `super` in overridden methods.
	# In views, the object `@resource` is available.
	module DryController
	extend ActiveSupport::Concern

	included do
	before_action :set_resource_class
	before_action :set_index, only: :index