20171118145028_create_hobbies.exs

defmodule TalkMe.Repo.Migrations.CreateHobbies do
  use Ecto.Migration

  def change do
    create table(:hobbies) do
      add :name, :string
      add :icon_url, :string

      timestamps()
    end

  end
end

20171118152738_create_users.exs

defmodule TalkMe.Repo.Migrations.CreateUsers do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :name, :string
      add :age, :integer
      add :avatar_url, :string

      timestamps()
    end

  end
end

20171118152945_create_in_between_hobby_link.exs

defmodule TalkMe.Repo.Migrations.CreateInBetweenHobbyLink do
  use Ecto.Migration

  def change do
    create table(:user_hobby_links) do
      add :user_id, references :users
      add :hobby_id, references :hobbies
    end
  end
end