Dillon Hafer
Toggle navigation
Dillon Hafer
Posts
Projects
About
Dillon Hafer
Posts
Projects
About
github
e-mail
rss
linkedin
Posts
Check if a form is valid
#javascript
Jan 13, 2023
Sort array of numbers
#javascript
Jan 1, 2023
ActiveStorage direct upload subfolders
#rails
Nov 12, 2022
Test values of an array
#javascript
Oct 22, 2022
How to add hidden fields to button_to
#rails
Oct 21, 2022
Fill in hidden fields with Capybara
#rails
Oct 20, 2022
Access Exclusive locks block select statements
#sql
Oct 19, 2022
Add custom flash keys
#rails
Oct 5, 2022
Enforce TLS... except for health checks
#rails
Oct 3, 2022
Clone a specific git branch
#git
Aug 31, 2022
CSS target pseudo class
#html-css
Aug 21, 2022
๐ง Change the delivery method of a mailer
#rails
Aug 19, 2022
Access last argument in a shell
#command-line
Aug 15, 2022
Reverse proxy tcp/udp with nginx
#devops
Aug 12, 2022
Pass request format to url_for
#rails
Jul 25, 2022
Invert a hash
#ruby
Jun 10, 2022
Split a string on the first occurrence
#ruby
May 5, 2022
Write a warning message to $stderr
#ruby
Apr 30, 2022
Listen for onfocus events on document
#javascript
Apr 28, 2022
Conditionally eager load relationships in graphql
#ruby
Apr 28, 2022
Set the id of the root document fragment
#javascript
Apr 26, 2022
Use an array with Rails' attribute API
#rails
Apr 25, 2022
Start multiple processes in dev env with bin/dev
#rails
Apr 25, 2022
Hash#transform_keys takes a hash
#ruby
Apr 24, 2022
Avoid time discrepancies when benchmarking
#ruby
Apr 22, 2022
Add primary key to table
#sql
Apr 16, 2022
Print unknown exceptions in PL/pgSQL
#sql
Apr 15, 2022
curl with a progress bar
#command-line
Apr 9, 2022
Rails::Application has a "console(&blk)" method
#rails
Apr 7, 2022
Use encrypted env vars with direnv
#workflow
Apr 6, 2022
Use + as a closure in Array reduce
#swift
Apr 6, 2022
Repeat a string in swift like ruby
#swift
Apr 2, 2022
Get size of terminal
#ruby
Apr 2, 2022
Prevent rails' file server from serving index.html
#rails
Mar 30, 2022
Implicit order column
#rails
Mar 29, 2022
Ignore ~/.psqlrc when using psql
#sql
Mar 26, 2022
Get database value of model instance
#rails
Mar 24, 2022
Array#first returns different classes based on arg
#ruby
Mar 23, 2022
Search in an array in PostgreSQL
#sql
Mar 14, 2022
Add element to beginning of array
#swift
Mar 14, 2022
Invoke procs with brackets
#ruby
Mar 11, 2022
Remove a line number with sed
#workflow
Mar 6, 2022
Add a gem to a specific group in a Gemfile
#ruby
Mar 4, 2022
Add TypeScript support to forms
#javascript
Feb 26, 2022
ActiveSupport has a presence method
#rails
Feb 25, 2022
Install latest version of ruby with asdf
#workflow
Feb 24, 2022
Reject blank input with graphql-ruby
#ruby
Feb 23, 2022
Only fk constraints may be altered in PostgreSQL
#sql
Feb 22, 2022
Check if string starts with character
#sql
Jan 27, 2022
Select first element from array_agg
#sql
Jan 19, 2022
Add global variables in typescript
#javascript
Jan 18, 2022
Values in Hash literals can be omitted in ruby 3.1
#ruby
Dec 26, 2021
Control video playback with keyboard controls
#swift
Dec 26, 2021
Keep 5 most recent files in a directory
#workflow
Dec 23, 2021
Use created_at in Ecto
#elixir
Dec 19, 2021
Rename iTerm tab with a shell function
#command-line
Dec 13, 2021
Ruby Struct can use keyword arguments
#ruby
Dec 10, 2021
How to install sqlite3 on heroku
#workflow
Dec 9, 2021
URI::MailTo has an email regex
#ruby
Dec 7, 2021
Ruby
#ruby
Dec 2, 2021
Lowercase a string in Python ๐
#python
Dec 1, 2021
CurrentAttributes.set takes a block
#rails
Nov 24, 2021
View last modified time of file
#workflow
Nov 8, 2021
Ruby has endless ranges
#ruby
Nov 6, 2021
Use react component prop in TypeScript
#react
Nov 4, 2021
Enable key repeat in VSCode
#workflow
Nov 3, 2021
Disable broken VSCode feature
#workflow
Oct 28, 2021
Increase size of ProgressView
#swiftui
Oct 24, 2021
Use older version of bundler
#ruby
Oct 17, 2021
Reset iOS permissions
#workflow
Oct 16, 2021
Split a string in elixir
#elixir
Oct 13, 2021
Replace first letter of string
#go
Oct 7, 2021
You MUST use a ws protocol in rails๐ฉactioncable
#rails
Sep 30, 2021
Ruby's ENV::[]= only accepts strings
#ruby
Sep 30, 2021
Custom RSpec negation matchers
#rails
Sep 29, 2021
Open a browser's Web Developer Tools with F12
#workflow
Sep 25, 2021
Method names can have spaces
#ruby
Sep 24, 2021
Have OS specific implementations in golang
#go
Sep 24, 2021
Get the first n items from a slice
#go
Sep 23, 2021
Enable vim mode in Xcode 13
#vim
Sep 21, 2021
Create a string with a null byte
#go
Sep 21, 2021
Pass keyword arguments when using send
#ruby
Sep 19, 2021
Ruby's Thread::Queue has a clear method
#ruby
Sep 17, 2021
String#๏ธโฃstart_with? "emoji"
#ruby
Sep 16, 2021
How to use ActiveRecored.pluck without Arel.sql
#rails
Sep 16, 2021
Encrypt a zip when archiving ๐ค๐
#workflow
Sep 14, 2021
Rails has helpers for uploading spec fixture files
#rails
Sep 13, 2021
Store cURL response headers in a file
#workflow
Sep 7, 2021
Check if in transaction in rails
#rails
Sep 6, 2021
javascript concat returns a new array
#javascript
Aug 5, 2021
Choose n random elements from an array
#ruby
Jul 27, 2021
Add a folder to git with exceptions
#git
Jul 20, 2021
ruby string has a
#ruby
Jul 15, 2021
rspec should receive thrice
#ruby
Jul 15, 2021
Split text in postgres
#sql
Jul 12, 2021
Replace multiple characters in ruby strings
#ruby
Jul 12, 2021
Use meta keys with AppleScript
#workflow
Jul 7, 2021
List cli xcodebuild archives in Xcode's organizer
#workflow
Jul 7, 2021
How to set authorized_keys in EdgeRouter X
#workflow
Jul 6, 2021
Save without formatting in VSCode
#workflow
Jul 1, 2021
๐ฏ Prevent development logs from bloating on macOS
#workflow
Mar 29, 2021
What directory is the parent of root ๐จโ๐ฆ๐
#command-line
Jan 27, 2021
prevent execution when creating materialized views
#sql
Dec 3, 2020
Ignore Array destructuring variables
#javascript
Nov 16, 2020
Copy remote file to local destination with Ansible
#devops
Sep 30, 2020
Fix poor type support in immutablejs
#javascript
Aug 9, 2020
Postgres Identity Column
#sql
Jul 20, 2020
pg_dump can dump foreign table schemas
#sql
Jun 17, 2020
๐ Ring a bell with ruby
#ruby
Jun 4, 2020
Let Postgres generate constraint names
#sql
May 13, 2020
List files vertically with ls
#command-line
Feb 15, 2020
Quickly switch workspaces in VSCode
#workflow
Feb 14, 2020
Cache-control behavior for ReactNative's Image
#react
Feb 13, 2020
Expo PushNotifications with pop-ups on Android
#react
Feb 12, 2020
Prefetch images in ReactNative
#react
Feb 11, 2020
RN fetch on Android requires mime type
#react
Feb 10, 2020
Ecto queries can be combined
#elixir
Feb 9, 2020
Wildcard prefix matching with tsquery
#sql
Feb 8, 2020
๐ styled-components limit prop names
#react
Feb 8, 2020
How to manually edit ufw rules
#devops
Feb 6, 2020
See git history of a renamed file
#git
Feb 5, 2020
How to typescript react native list refs
#react
Feb 4, 2020
How to redirect standard error
#workflow
Feb 3, 2020
How to remove stale remote-tracking branches
#git
Feb 2, 2020
How to only stage deleted files
#git
Feb 1, 2020
How to change the placeholder text color
#html-css
Jan 31, 2020
How to exclude files when using rm
#workflow
Jan 30, 2020
How to open the Settings App in ReactNative 0.60
#react
Jan 29, 2020
Browsers have a Web Cryptography API
#javascript
Jan 28, 2020
How to remove unused go modules
#go
Jan 27, 2020
How to use VSCode's built-in markdown preview
#workflow
Jan 25, 2020
How to remove unused deps from mix.lock
#elixir
Jan 25, 2020
What a cursor is in postgres
#sql
Jan 24, 2020
How to change the request body size in Phoenix
#elixir
Jan 23, 2020
Ecto can only execute 1 sql statement at a time
#elixir
Jan 6, 2020
Convert .mov to .gif with ffmpeg
#workflow
Sep 4, 2019
Sort files by date with /bin/ls
#workflow
Aug 30, 2019
Tuples are never inferred in TypeScript
#javascript
Jul 7, 2019
Apollo-React hooks can easily refetch queries
#react
Jun 27, 2019
Push git branch to another machine
#git
Jun 18, 2019
How to remove NotificationCenter observer in Swift
#workflow
May 28, 2019
How to expose entire Swift class to Objective-C
#workflow
May 28, 2019
Open iOS simulator app data directory
#workflow
May 24, 2019
๐ git reflog with timestamps
#git
Mar 21, 2019
Default values for Makefile vars
#workflow
Feb 22, 2019
๐ Using NSArray with CONTAINS NSPredicates
#workflow
Feb 19, 2019
๐งฎ assert_difference with negative values
#ruby
Feb 6, 2019
HTML
tag
#html-css
Jan 30, 2019
ๅ็ใชใใญใฐใฉใใณใฐ่จ่ชใง
#ruby
Jan 24, 2019
character_length string function
#sql
Oct 10, 2018
Shell parameter expansion
#workflow
Oct 3, 2018
Use a unix socket with Ecto
#elixir
Sep 3, 2018
Client Connection Vars with Ecto
#elixir
Sep 3, 2018
๐ฃpre-commit bypass
#git
Jul 31, 2018
NODE_OPTIONS without node
#javascript
Jun 26, 2018
Finds diffs in long line
#git
Apr 23, 2018
๐ผ๐ Get image dimensions from a shell
#command-line
Apr 18, 2018
๐ Update macOS from cli
#workflow
Apr 5, 2018
gcc case ranges
#objective-c
Mar 19, 2018
๐ข CLI to bump iOS target versions
#mobile
Mar 5, 2018
๐ Set foreign keys to null
#rails
Feb 20, 2018
Toggle macOS dock with keyboard โจ๏ธ
#workflow
Feb 6, 2018
Reinstall Gemfile
#ruby
Jan 12, 2018
Custom Browser with Create React App
#react
Oct 27, 2017
Custom Port with Create React App
#react
Oct 12, 2017
Find host and port in development
#rails
May 29, 2017
Rails/PG Statement Timeout ๐โฐ
#ruby
Apr 11, 2017
Update a specific gem with bundler
#ruby
Mar 30, 2017
group by 1, 2, 3 ๐ข
#sql
Feb 16, 2017
Open images in vim with iTerm ๐ผ
#vim
Dec 28, 2016
where am i @?
#ruby
Nov 24, 2016
Use PostgreSQL socket in database.yml ๐๐
#rails
Sep 12, 2016
Swap tmux panes
#workflow
Jul 14, 2016
Respect Do Not Track ๐โ๐จ
#javascript
Jul 9, 2016
Drop connections with Nginx
#workflow
Jul 9, 2016
๐ Private Shell History
#workflow
Jul 8, 2016
Remove a shell function
#command-line
May 18, 2016
Verify TLS cert with private key
#devops
May 12, 2016
Chaining TLS Certificates ๐ฑ
#devops
May 12, 2016
Let's Encrypt Cloudfront
#workflow
May 2, 2016
Trust Issues ๐ค
#workflow
Apr 29, 2016
Put -L in your ssh config
#workflow
Apr 4, 2016
Respect Do Not Track ๐โ๐จ
#javascript
Apr 2, 2016
Enable ScreenSharing from a terminal
#command-line
Mar 10, 2016
The Case of the Default ๐ต
#swift
Feb 23, 2016
-y apt-get?
#devops
Jan 22, 2016
Rails Sandbox ๐
#rails
Jan 19, 2016
Keep mina fast
#devops
Jan 1, 2016
Encrypt a zip archive
#devops
Dec 16, 2015
You have new mail.
#workflow
Sep 24, 2015
Use rsync with a custom port
#devops
Aug 28, 2015
Line Kill
#command-line
Aug 24, 2015
Limit SSH by IP address
#devops
Jun 17, 2015
Complex Fragment Caching with Rails
#rails
Feb 1, 2015
Full Text Search with PostgreSQL
#sql
Dec 8, 2014
Testing Subdomains with Capybara
#rails
Jul 22, 2013
ASP: Default to Dangerous
#C#
Apr 19, 2013