defp deps do
     ...
     {:ex_admin, "~> 0.8"},
     ...
  end

  defp deps do
     ...
     {:ex_admin, github: "smpallen99/ex_admin"},
     ...
  end

config :ex_admin,
  repo: MyProject.Repo,
  module: MyProject,    # MyProject.Web for phoenix >= 1.3.0-rc 
  modules: [
    MyProject.ExAdmin.Dashboard,
  ]

defmodule MyProject.Router do
  use MyProject.Web, :router
  use ExAdmin.Router
  ...
  scope "/", MyProject do
    ...
  end

  # setup the ExAdmin routes on /admin
  scope "/admin", ExAdmin do
    pipe_through :browser
    admin_routes()
  end

  defmodule MyProject.Repo do
    use Ecto.Repo, otp_app: :my_project
    use Scrivener, page_size: 10
  end

config :ex_admin,
  repo: MyProject.Repo,
  module: MyProject,
  modules: [
    MyProject.ExAdmin.Dashboard,
    MyProject.ExAdmin.MyModel,
  ]

defmodule TestExAdmin.ExAdmin.Simple do
  use ExAdmin.Register

  register_resource TestExAdmin.Simple do
    update_changeset :changeset_update
    create_changeset :changeset_create
  end
end

defmodule TestExAdmin.User do
  import Ecto.Changeset
  use Ecto.Schema
  import Ecto.Query

  schema "users" do
    field :name, :string
    field :email, :string
    field :active, :boolean, default: true
    has_many :products, TestExAdmin.Product, on_replace: :delete
    many_to_many :roles, TestExAdmin.Role, join_through: TestExAdmin.UserRole, on_replace: :delete
  end

  @fields ~w(name active email)

  def changeset(model, params \\ %{}) do
    model
    |> cast(params, @fields)
    |> validate_required([:email, :name])
    |> cast_assoc(:products, required: false)
    |> add_roles(params)
  end

  def add_roles(changeset, params) do
    if Enum.count(Map.get(params, :roles, [])) > 0 do
      ids = params[:roles]
      roles = TestExAdmin.Repo.all(from r in TestExAdmin.Role, where: r.id in ^ids)
      put_assoc(changeset, :roles, roles)
    else
      changeset
    end
  end
end

defmodule TestExAdmin.Role do
  use Ecto.Schema
  import Ecto.Changeset
  alias TestExAdmin.Repo

  schema "roles" do
    field :name, :string
    has_many :uses_roles, TestExAdmin.UserRole
    many_to_many :users, TestExAdmin.User, join_through: TestExAdmin.UserRole
  end

  @fields ~w(name)

  def changeset(model, params \\ %{}) do
    model
    |> cast(params, @fields)
  end
end


defmodule TestExAdmin.Product do
  use Ecto.Schema
  import Ecto.Changeset

  schema "products" do
    field :_destroy, :boolean, virtual: true
    field :title, :string
    field :price, :decimal
    belongs_to :user, TestExAdmin.User
  end

  def changeset(schema, params \\ %{}) do
    schema
    |> cast(params, ~w(title price user_id))
    |> validate_required(~w(title price))
    |> mark_for_deletion
  end

  defp mark_for_deletion(changeset) do
    # If delete was set and it is true, let's change the action
    if get_change(changeset, :_destroy) do
      %{changeset | action: :delete}
    else
      changeset
    end
  end
end

defmodule MyProject.ExAdmin.MyModel do
  use ExAdmin.Register
  register_resource MyProject.MyModel do

    index do
      selectable_column()

      column :id
      column :name
      actions()     # display the default actions column
    end
  end
end

defmodule MyProject.ExAdmin.Contact do
  use ExAdmin.Register

  register_resource MyProject.Contact do
    form contact do
      inputs do
        input contact, :first_name
        input contact, :last_name
        input contact, :email
        input contact, :register_date, type: Date # if you use Ecto :date type in your schema
        input contact, :category, collection: MyProject.Category.all
      end

      inputs "Groups" do
        inputs :groups, as: :check_boxes, collection: MyProject.Group.all
      end
    end
  end
end

defmodule MyProject.ExAdmin.Question do
  use ExAdmin.Register

  register_resource MyProject.Question do
    menu priority: 3

    show question do

      attributes_table   # display the defaults attributes

      # create a panel to list the question's choices
      panel "Choices" do
        table_for(question.choices) do
          column :key
          column :name
        end
      end
    end
  end
end

# lib/render.ex
defimpl ExAdmin.Render, for: Tuple do
  def to_string(tuple), do: inspect(tuple)
end

defmodule ElixirLangMoscow.SpeakerSlug do
  use EctoAutoslugField.Slug, from: [:name, :company], to: :slug
end

defmodule ElixirLangMoscow.Speaker do
  use ElixirLangMoscow.Web, :model
  use Arc.Ecto.Model

  alias ElixirLangMoscow.SpeakerSlug
  schema "speakers" do
    field :slug, SpeakerSlug.Type
    field :avatar, ElixirLangMoscow.Avatar.Type
  end
end

config :ex_admin,
  # ...
  field_type_matching: %{
    ElixirLangMoscow.SpeakerSlug.Type => :string,
    ElixirLangMoscow.Avatar.Type => :file
  }

config :ex_admin,
  theme: ExAdmin.Theme.ActiveAdmin,
  ...

config :ex_admin,
  skin_color: :purple,
  ...

config :ex_admin,
  theme_selector: [
    {"AdminLte",  ExAdmin.Theme.AdminLte2},
    {"ActiveAdmin", ExAdmin.Theme.ActiveAdmin}
  ],
  ...

def model_name do
  "custom_name"
end