If your terminal has many tabs, you'll want to keep them organized. To change their title from the prompt...

I had a huge MySQL dump that took forever (as in: days) to import, while I actually just wanted to...

You might sometimes use self to capture the context of this before it is destroyed by some function. Unfortunately self...

We have released Modularity 2. It has many incompatible changes. See below for a script to migrate your applications automatically...

When you do something like this in your code: def var_value @var ||= some_expensive_calculation end

TLDR: This card explains which threads and processes interact with each other when you run a Selenium test with Capybara...

tl;dr: Using has_many associations with a :through option can lead to lost or duplicate records. You should avoid...

We've since created ActiveType which has a restricted subset of Virtus' features. It might be enough for your needs...

Before Rails 3.2.14, when supplying an invalid locale to I18n, it would fall back to its config.i18n.default_locale (which is...

Goal Within before_* Within after_* Cancel later callbacks throw :abort throw :abort Rollback the transaction throw :abort raise ActiveRecord::Rollback...

This error occurs when you already have a database.yml which defines the database for the cucumber environment instead of test...

Say you have a User with a Carrierwave attribute #avatar: class User < ActiveRecord::Base mount_uploader :avatar, AvatarUploader end

When you want to find out the data type of an attribute, you can just use ActiveRecord's columns_hash...

Usually our mysql queries are not case sensitive. In order to query case sensitive, you can use the mysql COLLATE...

Whenever you create a table from a database migration, remember to add updated_at and created_at timestamps to that...

A snippet of the carrierwave documentation You might come to a situation where you want to retroactively change a version...

Rails has always included a scaffold script that generates a default controller implementation for you. Unfortunately that generated controller is...

It is good programming practice to Don't Repeat Yourself (or DRY). In Ruby on Rails we keep our code...

When writing Rails migrations to convert a string column to an integer you'd usually say: change_column :table_name...

I recently experienced the error ActiveRecord::StatementInvalid: Mysql2::Error: closed MySQL connection. Apparently this happens when there is a timeout...

There may be reasons to change the locale of your Postgres cluster. A popular one is your development system's...

So you're switching to PostgreSQL from MySQL? Here is some help... General hints on PostgreSQL \? opens the command overview...

Preface: Normally, you would not need this in integrations tests (probably that's why it is so hard to achieve...

Consul 0.10.0 now allows multiple power mappings for nested resources. When using nested resources you probably want two power