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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/migration/schema_migration.ex
defmodule Ecto.Migration.SchemaMigration do
# Define a schema that works with the schema_migrations table
@moduledoc false
use Ecto.Model
@primary_key {:version, :integer, []}
schema "schema_migrations" do
timestamps updated_at: false
end
@table %Ecto.Migration.Table{name: :schema_migrations}
@opts [timeout: :infinity, log: false]
def ensure_schema_migrations_table!(repo) do
adapter = repo.adapter
# DLL queries do not log, so we do not need
# to pass log: false here.
unless adapter.ddl_exists?(repo, @table, @opts) do
adapter.execute_ddl(repo,
{:create, @table, [
{:add, :version, :bigint, primary_key: true},
{:add, :inserted_at, :datetime, []}]}, @opts)
end
:ok
end
def migrated_versions(repo) do
repo.all from(p in __MODULE__, select: p.version), @opts
end
def up(repo, version) do
repo.insert %__MODULE__{version: version}, @opts
end
def down(repo, version) do
repo.delete %__MODULE__{version: version}, @opts
end
end