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Working with git remotes on Heroku

Generally, you will add a git remote for your Heroku app during the Heroku app creation process, i.e. heroku create. However, if you are working on an existing app and want to add git remotes to enable manual deploys, the following commands may be useful.

Adding a new remote

Add a remote for your Staging app and deploy

Note that on Heroku, you must always use master as the destination branch on the remote. If you want to deploy a different branch, you can use the syntax local_branch:destination_branch seen below (in this example, we push the local staging branch to the master branch on heroku.

$ git remote add staging https://git.heroku.com/staging-app.git

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version: 2
jobs:
  build-and-test:
    docker:
      - image: circleci/rust
    environment:
      # Fail the build if there are warnings
      RUSTFLAGS: '-D warnings'
    steps:
      - checkout

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Based on this blogpost.

Install with Homebrew:

$ brew install postgresql

Run server:

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PoC: GraphQL Ruby fragment caching

This example demonstrates how we can cache the response fragments in graphql-ruby.

Existing solutions only allow caching resolved values but not all the GraphQL machinery (validation, coercion, whatever).

Caching response parts (in case of Ruby, sub-Hashes) is much more efficient.

Benchmarks

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Updating a feature branch

First we'll update your local master branch. Go to your local project and check out the branch you want to merge into (your local master branch)

$ git checkout master

Fetch the remote, bringing the branches and their commits from the remote repository. You can use the -p, --prune option to delete any remote-tracking references that no longer exist in the remote. Commits to master will be stored in a local branch, remotes/origin/master

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require 'openssl'

class String
  def encrypt(key)
    cipher = OpenSSL::Cipher.new('DES-EDE3-CBC').encrypt
    cipher.key = Digest::SHA1.hexdigest key
    s = cipher.update(self) + cipher.final

    s.unpack('H*')[0].upcase
  end

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Screen Quick Reference

Basic

Description	Command
Start a new session with session name	screen -S <session_name>
List running sessions / screens	screen -ls
Attach to a running session	screen -x
Attach to a running session with name	screen -r

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# Ruby opposite of array intersection... or maybe the method is missing from my brain bc not enough coffee
# http://twitter.com/soawesomeman/status/8035087261

def awesome(ar_1, ar_2)
  (ar_1 + ar_2) - (ar_1 & ar_2) 
end

awesome([1,2,3,4], [3,4,5,6]) # => [1, 2, 5, 6]

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defp upsert_profile(multi, source, source_uuid, profile_url) do
  profile = %Profile{
    source: source,
    source_uuid: source_uuid,
    profile: profile_url,
  }

  Ecto.Multi.insert(multi, source_uuid, profile, on_conflict: [set: [profile: profile_url]], conflict_target: [:source, :source_uuid])
end

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# ensure a [unique constraint](https://hexdocs.pm/ecto/constraints-and-upserts.html) on the user table, 
# this uses the `on_conflict` option to ensure the record exists before selecting,
# which should avoid a race condition. [docs](https://hexdocs.pm/ecto/Ecto.Repo.html#c:insert/2-upserts) 
def find_or_create(user_params) do
  {:ok, user} = %User{}
    |> User.changeset(user_params)
    |> Repo.insert(on_conflict: :nothing)

  if is_nil(user.id) do
    Repo.one from u in User, where: u.id == ^user.id