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defmodule Queue do
  def insert(queue, item), do: :queue.in(item, queue)

  def insert_last(queue, item), do: :queue.in_r(item, queue)

  def member?(queue, item), do: :queue.member(item, queue)

  def filter(queue, fun), do: :queue.filter(fun, queue)

  def split(queue, n) do

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function new = () => ({
  _struct: "Conn",
  host: null,
  path: null,
  port: null,
  scheme: null,
  params: {},
  requestHeaders: [],
  responseHeaders: [],
  responseBody: {},

imranismail

Elixir Tips and Tricks That You Might Not Know Of

SaaS/Multitenant Migrations with Ecto

defmodule App.Team do
  use App, :schema

  ...

imranismail

defmodule Shopify.Cache do
  use Maxwell.Middleware
  
  alias :timer, as: Timer

  @ttl Timer.minutes(5)

  def call(conn, next, opts), do: get!(conn, fn _ -> super(conn, next, opts) end)

  def get!(key, fallback \\ nil) do

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initial = %{sunday: 0, monday: 0, tuesday: 0, wednesday: 0, thursday: 0, friday: 0, saturday: 0}

from(o in Order,
  where: o.inserted_at > fragment("DATE_TRUNC('week', CURRENT_TIMESTAMP)"),
  group_by: fragment("EXTRACT(DOW FROM ?)", o.inserted_at),
  order_by: fragment("EXTRACT(DOW FROM ?)", o.inserted_at),
  select: {fragment("EXTRACT(DOW FROM ?)", o.inserted_at), count(o.id)}
)
|> Repo.all()
|> Enum.reduce(initial, fn

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defmodule Blog.Attachment do
  use Blog, :schema

  @primary_key {:id, :binary_id, autogenerate: true}
  @storage_path "attachments"

  schema "attachments" do
    field :file, :any, virtual: true
    belongs_to :post, Post

imranismail

Implementing Ruby's lonely operator using Elixir's custom infix function

iex> import ViewHelper
iex> user = %{name: "Imran", address: %{postcode: 33160}}
iex> user ~> :name
# "Imran"
iex> user ~> :address ~> :postcode
# 33160
iex> user ~> :address ~> :country

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Usage

iex> alias Data.Post
iex> Post |> Post.by_status(:published) |> Repo.all()
iex> Post |> Post.by_status([:draft, :published]) |> Repo.all()

References

https://github.com/gjaldon/ecto_enum

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Repo Composition

Motive

Ecto.Repo by default doesn't allow overrides. So when you need to compose functions but maintain an API parity with the Ecto.Repo. You'd need to compose the functions in another module and things can get messy really fast that way.

Can't invoke super

== Compilation error on file lib/app/repo.ex ==
** (CompileError) lib/app/repo.ex:6: no super defined for all/2 in module App.Repo. Overridable functions available are:

imranismail

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.