Know-How

This is our digital garden, which includes tips, tricks, recipes, stories and opinions about technical topics.

Docker

• Blue/green deployments

Hardware

• Keyboard love: the ZSA moonlander
• Keyboard love: the ZSA voyager

MySQL

• Drop multiple tables

PostgreSQL

• Copy database
• psql commands

Authentication/Authorization

• Check access rights
• Grant access
• Allow login

Ruby on Rails

• Ensure Rails is loaded in an initializer
• Stimulus/Turbo JavaScript error

ActionCable

• Find devise user in channel

ActionController

• Do not set cookie
• Raise 404 in controller
• Own not found page
• Stream response

ActionMailer

• Helpers
• Send email from console

ActionView

• Cancel link
• Default template engine for generators
• Passing variables to views
• Inline assets with propshaft
• Render a Markdown string
• Render outside request
• Check if view exists

ActionView forms

• Submit labels

ActionView view components

• Set default_url_options

ActiveModel

• Attribute types
• Validate array inclusion
• Validate date in range
• Validate email address
• Validate url

ActiveRecord

• Change default value in migration
• Clear query cache
• Create join table
• Check database configuration
• Foreign key to differently named table
• Find models without associated models
• Different database systems
• Unique index on multiple columns
• Zero downtime migrations

ActiveRecord Postgres

• Create array in postgres
• Concurrent index
• Check for value in array
• Index name too long
• Is string null or empty?
• Select attribute within JSONB
• Get Postgres version from Rails console

ActiveRecord SQL

• Execute SQL query

ActiveStorage

• Attach file
• Migrate documents from S3 to local storage
• MinIO configuration
• Sanitize filename

ActiveSupport

• Change date parts
• Sign URLs

Authentication

Devise

• Login user if possible

Authorization

Cancancan

• Redirect on access denied

Data

• Parse a boolean

Datetime

• Duration methods

Debugging

Gems

• Show whole backtrace

Internationalization

• Set current locale
• Fallbacks

Rake

• Rake task with arguments

Routing

• Scope controller below a parent one

Turbo

• Automatic form submission
• Turbo.visit with stream

RSpec

• Attach file with capybara
• Check that email was sent
• Inspect test data in database
• Use `dom_id` in a spec
• Define route within spec
• Expect a job to be enqueued
• File fixtures
• Find link by text in e-mail
• not_change matcher
• Run without a type
• Stub Rails.env
• Find WebMock requests
• Expect within epsilon

Capybara

• Screenshots on Github Actions

Mocks

• Different return values
• Stub unverified method

Ruby

• Source location of class or module
• eql and equality operators
• Local Gemfile
• Source location of method
• Method definition on one line
• Root URL
• Catch signal from Ctrl-c
• Use standard confing for Rubocop
• Call super of super
• Pass options to to_csv
• Bundle gems into vendor

irb

• Redefine class

User Experience (UX)

• Dark UX Patterns: Cookie Banners