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Robust user authentication solution

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pow lib pow extension ecto schema migration.ex
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lib/pow/extension/ecto/schema/migration.ex 

defmodule Pow.Extension.Ecto.Schema.Migration do

  @moduledoc """

  Generates schema migration content for extensions.

  """

  alias Pow.{Config, Ecto.Schema.Migration, Extension.Ecto.Schema}



  @template """

  defmodule <%= inspect schema.repo %>.Migrations.<%= schema.migration_name %> do

    use Ecto.Migration



    def change do

      alter table(:<%= schema.table %>) do<%= for {k, v} <- schema.attrs do %>

        add <%= inspect k %>, <%= inspect v %><%= schema.migration_defaults[k] %><% end %><%= for {_, i, _, s} <- schema.assocs do %>

        add <%= if(String.ends_with?(inspect(i), "_id"), do: inspect(i), else: inspect(i) <> "_id") %>, references(<%= inspect(s) %>, on_delete: :nothing<%= if schema.binary_id do %>, type: :binary_id<% end %>)<% end %>

      end

  <%= for index <- schema.indexes do %>

      <%= index %><% end %>

    end

  end

  """



  @doc """

  Generates migration schema map.

  """

  @spec new(atom(), atom(), binary(), Config.t()) :: map()

  def new(extension, context_base, schema_plural, config \\ []) do

    repo           = Config.get(config, :repo, Module.concat([context_base, "Repo"]))

    config         = Config.put(config, :extensions, [extension])

    attrs          = Schema.attrs(config)

    indexes        = Schema.indexes(config)

    migration_name = name(extension, schema_plural)



    Migration.schema(context_base, repo, schema_plural, migration_name, attrs, indexes, config)

  end



  defp name(extension, table) do

    extension_name =

      extension

      |> Module.split()

      |> List.last()



    "Add#{extension_name}To#{Macro.camelize(table)}"

  end



  @doc """

  Generates migration file content.

  """

  @spec gen(map()) :: binary()

  def gen(schema) do

    EEx.eval_string(unquote(@template), schema: schema)

  end

end