Programming Ecto

Generating a Form for a Single Schema

Let’s set up a simple User schema to use as a starting point. We’ll define fields for name and age and add a changeset function that will cast and validate incoming parameters:

priv/examples/phoenix_forms_01.exs

defmodule MyApp.User do
  import Ecto.Changeset
  use Ecto.Schema

  schema "users" do
    field :name, :string
    field :age, :integer
  end

  def changeset(user, params) do
    user
    |> cast(params, [:name, :age])
    |> validate_required(:name)
    |> validate_number(:age, greater_than: 0,
         message: "you are not yet born")
  end

end

Next, we’ll need a controller. When we invoke ...