yannvery

Extract error events from Bugsnag

Install bugsnag-api-gem gem

https://github.com/bugsnag/bugsnag-api-ruby

gem install bugsnag-api-gem

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When you encounter

/Users/kernel/.gem/ruby/2.0.0/gems/mysql2-0.3.16/lib/mysql2.rb:8:in 
  `require': dlopen(/Users/kernel/.gem/ruby/2.0.0/gems/mysql2-0.3.16/lib/mysql2/mysql2.bundle, 9): 
    Library not loaded: 
      /usr/local/lib/libmysqlclient.18.dylib (LoadError)

Try gem pristine mysql2, this command restores installed gems to pristine condition from files located in the gem cache

yannvery

Use uuid on rails with PostgreSQL

This guide is a sort of extract of official rails guide: Official rails guide

Here I describe an implementation of uuid with PostgreSQL >= 9.4. This requires to enable pgcrypto

Example with a creation of a table named trackers:

class CreateTrackers < ActiveRecord::Migration[5.0]

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Export database

pg_dump database_name > database_name.dump

Export Structure

pg_dump -s database_name > database_name.dump

Restore/Import Database with pg_dump

pg_restore --verbose --clean --no-acl --no-owner -h localhost -d database_name database_file.dump

yannvery

RSpec Cheatsheet

Specs layers

 +-----------------------------------------------------------------------------------------+

   +----------+                                                       +------------------+
   |          |                                                       |                  |
   |  View    |                                                       |                  |
   |  Specs   |            View                                       |                  |

yannvery

How to set a rake task in crontab with RVM

Introduction

It seems there is multiple ways to configure rvm and use it on a crontab. Here I describe a method which be used on a client app

Let assume you want to launch rake stats on production_app application and write the results on a file

Find the wrapper app

yannvery

Finding caller of sql query in a Rails App

I've been wanted to know where some sql queries are coming from. I worked on a Rails app with some tests which have been executed slowly. In the log file I saw this request a bunch of time :

SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 8 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))

So I've decided to use a Ryan Bigg tips. I've included this snippet in my test suite :

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Create a fake api in 5 minutes

I dont't find yet how to do this with ruby, so I use a npm package.

Install json-server

github repository: https://github.com/typicode/json-server

Note: g option has been used to install the package globally (for all users).

yannvery

TracePoint and Rails reload! / startup

On a specific rails application (4.2), when a developper call reload! method on a console he'll see:

Engine Load (0.3ms)  SELECT  `engines`.* FROM `engines` WHERE `engines`.`label` = 'influencer' LIMIT 1
Engine Load (0.3ms)  SELECT  `engines`.* FROM `engines` WHERE `engines`.`label` = 'speaker' LIMIT 1
Engine Load (0.3ms)  SELECT  `engines`.* FROM `engines` WHERE `engines`.`label` = 'animator' LIMIT 1
Engine Load (0.2ms)  SELECT  `engines`.* FROM `engines` WHERE `engines`.`label` = 'ambassador' LIMIT 1
Engine Load (0.2ms) SELECT `engines`.* FROM `engines` WHERE `engines`.`label` = 'private_show' LIMIT 1

yannvery

Regexp and match groups in ruby

There is multiple ways to use regular expressions with ruby.

Simple example

We're going to use the following pattern: /\A\d{3}-[\w-]+\.\w{3,4}\z/

pattern = /\A\d{3}-[\w-]+\.\w{3,4}\z/
pattern =~ "215-hello-world.avi"     # => 0
pattern =~ "test.mp3"                # => 0