Finish Ecto guide

ecto.md

@@ -670,5 +670,8 @@ Friends.Repo.delete(person)
 
 Similar to `insert` and `update`, `delete` returns a tuple. If the deletion succeeds, then the first element in the tuple will be `:ok`, but if it fails then it will be an `:error`.
 
+## Conclusion
+
+In this guide we've covered creating, reading, updating and deleting records using Ecto. I hope that you've learned something valuable from it.
 
 

ecto/.gitignore

@@ -0,0 +1,5 @@
+/_build
+/cover
+/deps
+erl_crash.dump
+*.ez

ecto/README.md

@@ -0,0 +1,20 @@
+# Friends
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed as:
+
+  1. Add friends to your list of dependencies in `mix.exs`:
+
+        def deps do
+          [{:friends, "~> 0.0.1"}]
+        end
+
+  2. Ensure friends is started before your application:
+
+        def application do
+          [applications: [:friends]]
+        end
+

ecto/config/config.exs

@@ -0,0 +1,34 @@
+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+config :friends, Friends.Repo,
+  adapter: Ecto.Adapters.Postgres,
+  database: "friends"
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure for your application as:
+#
+#     config :friends, key: :value
+#
+# And access this configuration in your application as:
+#
+#     Application.get_env(:friends, :key)
+#
+# Or configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env}.exs"

ecto/lib/friends.ex

@@ -0,0 +1,20 @@
+defmodule Friends do
+  use Application
+
+  # See http://elixir-lang.org/docs/stable/elixir/Application.html
+  # for more information on OTP Applications
+  def start(_type, _args) do
+    import Supervisor.Spec, warn: false
+
+    children = [
+      worker(Friends.Repo, []),
+      # Define workers and child supervisors to be supervised
+      # worker(Friends.Worker, [arg1, arg2, arg3]),
+    ]
+
+    # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: Friends.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end

ecto/lib/friends/person.ex

@@ -0,0 +1,16 @@
+defmodule Friends.Person do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "people" do
+    field :first_name, :string
+    field :last_name, :string
+    field :age, :integer
+  end
+
+  def changeset(person, params \\ %{}) do
+    person
+    |> cast(params, ~w(first_name last_name age))
+    |> validate_required([:first_name, :last_name])
+  end
+end

ecto/lib/friends/repo.ex

@@ -0,0 +1,4 @@
+defmodule Friends.Repo do
+  use Ecto.Repo,
+    otp_app: :friends
+end

ecto/mix.exs

@@ -0,0 +1,36 @@
+defmodule Friends.Mixfile do
+  use Mix.Project
+
+  def project do
+    [app: :friends,
+     version: "0.0.1",
+     elixir: "~> 1.2",
+     build_embedded: Mix.env == :prod,
+     start_permanent: Mix.env == :prod,
+     deps: deps]
+  end
+
+  # Configuration for the OTP application
+  #
+  # Type "mix help compile.app" for more information
+  def application do
+    [applications: [:logger, :postgrex],
+     mod: {Friends, []}]
+  end
+
+  # Dependencies can be Hex packages:
+  #
+  #   {:mydep, "~> 0.3.0"}
+  #
+  # Or git/path repositories:
+  #
+  #   {:mydep, git: "https://github.com/elixir-lang/mydep.git", tag: "0.1.0"}
+  #
+  # Type "mix help deps" for more examples and options
+  defp deps do
+    [
+      {:ecto, "2.0.0-beta.2"},
+      {:postgrex, "0.11.1"}
+    ]
+  end
+end

ecto/mix.lock

@@ -0,0 +1,6 @@
+%{"connection": {:hex, :connection, "1.0.2"},
+  "db_connection": {:hex, :db_connection, "0.2.5"},
+  "decimal": {:hex, :decimal, "1.1.1"},
+  "ecto": {:hex, :ecto, "2.0.0-beta.2"},
+  "poolboy": {:hex, :poolboy, "1.5.1"},
+  "postgrex": {:hex, :postgrex, "0.11.1"}}

ecto/priv/repo/migrations/20160410062326_create_people.exs

@@ -0,0 +1,11 @@
+defmodule Friends.Repo.Migrations.CreatePeople do
+  use Ecto.Migration
+
+  def change do
+    create table(:people) do
+      add :first_name, :string
+      add :last_name, :string
+      add :age, :integer
+    end
+  end
+end

ecto/test/friends_test.exs

@@ -0,0 +1,8 @@
+defmodule FriendsTest do
+  use ExUnit.Case
+  doctest Friends
+
+  test "the truth" do
+    assert 1 + 1 == 2
+  end
+end

ecto/test/test_helper.exs

@@ -0,0 +1 @@
+ExUnit.start()