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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 a table, which is schema_migrations by default
@moduledoc false
use Ecto.Schema
import Ecto.Query, only: [from: 2]
@primary_key false
schema "schema_migrations" do
field :version, :integer
timestamps updated_at: false
end
@opts [timeout: :infinity, log: false]
def ensure_schema_migrations_table!(repo, prefix) do
adapter = repo.__adapter__
create_migrations_table(adapter, repo, prefix)
end
def migrated_versions(repo, prefix) do
from(p in {get_source(repo), __MODULE__}, select: p.version)
|> Map.put(:prefix, prefix)
|> repo.all(@opts)
end
def up(repo, version, prefix) do
%__MODULE__{version: version}
|> Ecto.put_meta(prefix: prefix, source: get_source(repo))
|> repo.insert!(@opts)
end
def down(repo, version, prefix) do
from(p in {get_source(repo), __MODULE__}, where: p.version == ^version)
|> Map.put(:prefix, prefix)
|> repo.delete_all(@opts)
end
def get_source(repo) do
Keyword.get(repo.config, :migration_source, "schema_migrations")
end
defp create_migrations_table(adapter, repo, prefix) do
table_name = repo |> get_source |> String.to_atom
table = %Ecto.Migration.Table{name: table_name, prefix: prefix}
# DDL queries do not log, so we do not need to pass log: false here.
adapter.execute_ddl(repo,
{:create_if_not_exists, table, [
{:add, :version, :bigint, primary_key: true},
{:add, :inserted_at, :naive_datetime, []}]}, @opts)
end
end