Triangle.rb meetup - Phoenix for Rails developers

Web framework developed with Elixir

Elixir

Erlang Virtual Machine (a.k.a. BEAM), anologous to JVM.

defmodule HelloWorld do
  def greeting(name \\ "World") do
    "Hello, #{name}!"
  end
end

IO.puts

elixir hello.exs

Actor model of concurrency

Asynchronous (lightweight) processes sending immutable messages to each other.

Immutable data

s = "HELLO"
String.downcase s
IO.puts s # => "HELLO"

s = String.downcase s
IO.puts s # => "hello"

Pipeline operator

Sanitizer.sanitize(html)
|> Markdownify.render
|> MarkdownSanitizer.sanitize
|> Formatter.format
|> String.gsub "&#39;", "'"

Pattern matching

Multiple methods with the same name, chosen based on best match for given arguments.

Recursion rather than looping

Phoenix

Developed symbiotically with Elixir.

Precompiled templates

View modules

Views and templates are not the same.

defmodule MyApp.UserView do
  use MyApp.Web, :view
  alias MyApp.User

  def first_name(%User{name: name}) do
  end
end

Ecto for accessing data stores

Not bundled with Phoenix, but common developers.

defmodule MyApp.Category do
  use MyApp.Web, :model

  schema "categories" do
    field :name, :string

    timestamps
  end

  @required_fields ~w(name)
  @optional_fields ~w()

  def changeset(struct, params \\ %{}) do
    struct
    |> cast(params, [:name])
    |> validate_required([:name])
  end

  def alphabetical(query) do
    from c in query, order_by: c.name
  end
end