Is this code regular elixir code or ecto DSL code?

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1

Is this code regular elixir code or ecto DSL code?
If it is regular Elixir code then what is the type of structure being passed to create table?

defmodule Sipusers.Repo.Migrations.CreateCustomers do
  use Ecto.Migration

  def change do
    create table(:customers) do
      add :custname, :string
      add :email, :string
      add :account_id, :string
      add :first_device, :string
      add :first_tel_no, :string
      add :active, :boolean
      timestamps
    end
  end
end
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2

It’s both at the same time!

Ecto.Migration.change/2 is a macro that takes a block (the bit between do and end) and transforms the AST in order to ensure certain behaviors (such as adding a primary key if you haven’t defined one).
You can take a look at how it’s implemented here:
https://github.com/elixir-ecto/ecto/blob/master/lib/ecto/migration.ex#LL259

Ecto.Migration.add/3 which is used inside that block is just a regular function that takes a field name, a type and a Keyword list of options. You could also write it like this: Ecto.Migration.add(:name, :type, [key: val]).

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3

https://hexdocs.pm/ecto/Ecto.Migration.html#table/2

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