Today I Learned

A Hashrocket project

10 posts by andrewvogel @calllmehvogel

Deleting Words in Vim

As a recent vim convert, I learn new commands everyday from my fellow rocketeers. Here’s some cool ones for deleting words:

  • Use dw to delete word. Cursor placement is important! If your cursor is not on the first character, it will only delete from your cursor to the end of the word.
  • Use diw to delete inside word. Deletes the entire word that your cursor resides in.
  • Use dt<char> to delete to character. Deletes from your cursor to the specified character.

Getting BetterErrors in Rails While Using Ngrok

By default, the BetterErrors gem only works for localhost. If you’re using ngrok to access your rails server and you want to have access to BetterErrors, you’ll need to whitelist the IP of the machine that ngrok is running on.

Add the following to development.rb:

BetterErrors::Middleware.allow_ip!(NGROK_MACHINE_PUBLIC_IP)
# - or -
# Use an IP finding service to grab your public IP each time you start the server:
# (ipecho.net, api.ipify.org, etc.)
BetterErrors::Middleware.allow_ip!(open('http://api.ipify.org').read)

Set the Domain or Host in Rails URL Helpers

You can explicitly set the domain with Rails URL Helpers:

app.root_url
=> "http://www.example.com/"

app.root_url(domain: 'www.customdomain.org')
=> "http://www.customdomain.org"

 

If we include the protocol in our domain argument, this brings up an interesting gotcha. Check it out:

app.root_url(domain: 'http://www.customdomain.org')
=> "http://www.http://www.customdomain.org/"

 

Thankfully, Rails gives us the host option. Host will use a Regex to remove the protocol from the argument:

app.root_url(host: 'https://www.customdomain.org')
=> "http://www.customdomain.org/"

 

Notice the output in the last example; our protocol was replaced removed and replaced with http. You can use the protocol argument to enforce your protocol on a given host:

app.root_url(host: 'http://www.customdomain.org', protocol: 'https')
=> "https://www.customdomain.org/"

Alias A Model Method Or Field in a GraphQL Type

If you need to override the name of a model method or field in a GraphQL type, you can use the property argument.

Let’s say we have a model called Message:

class Message < ApplicationRecord
  def bar
    "bar"
  end
end

We can then make an alias to the bar method by specifying a property in our MessageType:

Types::MessageType = GraphQL::ObjectType.define do 
  field :foo, types.String, property: :bar
end