francois-blanchard

DateTime and Time Rails Helpers

Time.current.beginning_of_day
=> Tue, 12 Jan 2016 00:00:00 CET +01:00
Time.current.beginning_of_hour
=> Tue, 12 Jan 2016 18:00:00 CET +01:00
Time.current.beginning_of_minute
=> Tue, 12 Jan 2016 18:12:00 CET +01:00
Time.current.end_of_day

francois-blanchard

Begin rescue with ruby ☔

Basic

begin
  # something which might raise an exception
rescue SomeExceptionClass => some_variable
  # code that deals with some exception
rescue SomeOtherException => some_other_variable

francois-blanchard

Find top 10 largest file/directories

$ sudo du -ha /home | sort -n -r | head -n 50

francois-blanchard

View log with crontab tasks

# 1. Open crontab
$ crontab -e

# 2. Add output log file
30 03 * * * /bin/bash -l -c 'backup perform -t my_backup' >> ~/crontab/backuplog

# 3. Open log file

francois-blanchard

Lolcommit : git + webcam

Gem for take gif when you commit with git

Install

$ brew install imagemagick
$ brew install ffmpeg
$ gem install lolcommits

francois-blanchard

Error Mysql when you try to delete row - Cannot delete or update a parent row: a foreign key constraint fails

You can't delete this row because any other is link to her with a foreign key

Find errors

1. Try to delete
2. View log with SHOW ENGINE INNODB STATUS;

Force delete row

1. Disable foreign key SET FOREIGN_KEY_CHECKS=0;

francois-blanchard

Error Capistrano deploy - fatal: Could not parse object 'xx...xx'

1. Connect you to your server $ ssh user@myserver
2. Go to your deploy path and select the shared directorycd /your/directory/deploy/shared
3. Remove the git cache rm -rf cached-copy
4. Retry to deploy & have fun ;)

francois-blanchard

Create nested attributes with checkbox

# Class
has_many :sc_invited_celebrities
accepts_nested_attributes_for :proposed_posts, :sc_invited_celebrities, :answer_to_questions

# Controller
def new
 @social_campaign = SocialCampaign.new

francois-blanchard

DROP mongoDB collection

$ mongo
> show dbs
> use lolrate_development
> show collections
> db.games.drop()
> db.participants.drop()
> db.banned_champions.drop()

francois-blanchard

Import mongoDB bson files

$ mongorestore -d db_name -c collection_name path/collection_name.bson

Options

delete with restore

-- drop