brainlid

defmodule MyApp.Books.Book do
  use Ecto.Schema
  import Ecto.Query, warn: false
  import Ecto.Changeset
  import MyApp.ChangesetHelpers

  schema "books" do
    field :name, :string

    field :genres, {:array, :string}, default: []

brentjanderson

These snippets provide a foundation for starting and stopping supervision trees at runtime using feature flags (e.g. Launch Darkly).

Some things to note when adapting these snippets:

1. application.ex needs to be adapted into an existing application. The important part is that each child spec provided is compliant, and that there is a feature flag (ld_key) specified.
2. As written, if a feature flag fails for some reason, it defaults to starting all children. There is room for adaptation here as needed.
3. This implementation will still require a FeatureFlags module to be available that implements is_on?/2. Adjust as needed to accomodate your own feature flag setup.

zblanco

Getting Lazy with Dataflow Graphs in Elixir

Intro

What do Tensorflow, Apache Airflow, Rule Engines, and Excel have in common?

Under the hood they all use DAGs to model data-flow dependencies of the program. Using graphs to model programs is great because you can modify the program at runtime. Lets talk about doing this in Elixir for great good.

LostKobrakai

defmodule NestedWeb.FormLive do
  use NestedWeb, :live_view
  require Logger

  defmodule Form do
    use Ecto.Schema
    import Ecto.Changeset

    embedded_schema do
      field :name, :string

mrdotb

defmodule AppWeb.Host do
  @moduledoc """
  Conveniences for working with host.
  """
  def root do
    Keyword.get(get_config(), :root)
  end

  def root_uri do
    Keyword.get(get_config(), :root_uri)

angelikatyborska

# Has one external dependency except for Gettext: https://github.com/rrrene/html_sanitize_ex

defmodule MyApp.Gettext do
  @doc """
  A helper for translations with links.

  Pass in the translation string which must include
  `%{link_start}`/`%{link_end}`. For multiple URLs, use
  `%{link_start_<0,1,2...>}`.

PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements

basnijholt

//@version=4
study(title="CTO Line", shorttitle="CTO", overlay=true, resolution="")
smma(src, length) =>
    smma = 0.0
    smma := na(smma[1]) ? sma(src, length) : (smma[1] * (length - 1) + src) / length
    smma
v1 = smma(hl2, 15)
m1 = smma(hl2, 19)
m2 = smma(hl2, 25)
v2 = smma(hl2, 29)

alex-min

require('fattable/fattable.js');


/* 
 * This variable is used to keep the scroll position when the live view navigation changes.
 * This is useful for modals.
*/
let keepScroll = {};

export default {

goofansu

let Uploaders = {}

Uploaders.S3 = function (entries, onViewError) {
  entries.forEach(entry => {
    let xhr = new XMLHttpRequest()
    onViewError(() => xhr.abort())
    xhr.onload = () => (xhr.status === 200 ? entry.done() : entry.error())
    xhr.onerror = () => entry.error()
    xhr.upload.addEventListener("progress", event => {
      if (event.lengthComputable) {