alanpeabody

Web apps in Elixir

The database

Ecto

Database lib/DSL currently targeting PostgreSQL.

• Source: https://github.com/elixir-lang/ecto
• Docs: http://hexdocs.pm/ecto/0.2.5/

alanpeabody

Ember Best Practices

Some thoughts and ideas on best practices building Ember apps after 2 years building and maintaining 6+ apps. This is less about the obvious best practices, like use ember-cli, and more along the lines of when to use what technique. As with every best practice there are exceptions to every rule.

Ember data

Ember data relationships

Routing

alanpeabody

  defp execute_in_direction(repo, :forward, level, {:create_if_not_exists, %Index{}=index}) do
    if !repo.adapter.ddl_exists?(repo, index, @opts) do
      repo.adapter.execute_ddl(repo, {:create, index}, @opts)
    end
  end

  defp execute_in_direction(repo, :backward, level, {:drop_if_exists, %Index{}=index}) do
    if !repo.adapter.ddl_exists?(repo, index, @opts) do
      repo.adapter.execute_ddl(repo, {:create, index}, @opts)
    end

alanpeabody

defmodule User do
  use Ecto.Model
  
  schema "users" do
    field :email, :string
    field :hashed_password, :string
    field :password, :string, virtual: true
    field :password_confirmation, virtual: true
    
    timestamps

alanpeabody

# config/config.ex
config :app, App.Repo,
  database: "my_app_dev",
  username: "postgres",
  password: "nope",
  hostname: "localhost",
  extensions: [{Extensions.Json, library: Poison}]

alanpeabody

defmodule Extensions.JSON do
  alias Postgrex.TypeInfo

  @behaviour Postgrex.Extension
  @json ["json", "jsonb"]

  def init(_parameters, opts),
    do: Keyword.fetch!(opts, :library)

  def matching(_library),

alanpeabody

# Generated with mix ecto.gen.migration add_user_settings_and_address
defmodule App.Repo.Migrations.AddUserSettingsAndAddress do
  use Ecto.Migration

  def change do
    alter table(:users) do
      add :settings,  :json
      add :addresses, :json
    end
  end

alanpeabody

defmodule App.Models.User do
  use Ecto.Model

  schema "users" do
    field :email,        :string
    field :crypted_pass, :string
    field :settings,     App.Models.Settings.Type
    field :addresses,    App.Models.Address.Type

    timestamps

alanpeabody

defmodule App.Models.Settings do
  defstruct [
    newsletter:          false,
    publish_profile:     true,
    email_notifications: true
  ]

  defmodule Type do
    @behaviour Ecto.Type
    alias App.Models.Settings

alanpeabody

defmodule App.Models.Address do
  defstruct [:address, :address2, :city, :region, :postal, :country]

  defmodule Type do
    @behaviour Ecto.Type
    alias App.Models.Address

    def type, do: :json

    def cast(addrs) when is_list(addrs) do