Add support for drop/rollback operations for collections and indexes.

lib/arangodb_ecto/migration.ex

@@ -52,20 +52,44 @@ defmodule ArangoDB.Ecto.Migration do
     Arangoex.Collection.create(endpoint, %Arangoex.Collection{name: name, type: collection_type})
   end
 
+  defp execute(endpoint, {cmd, %Ecto.Migration.Table{name: name}}, _opts)
+      when cmd in [:drop, :drop_if_exists]
+  do
+    Arangoex.Collection.drop(endpoint, %Arangoex.Collection{name: name})
+  end
+
   defp execute(endpoint, {cmd, %Ecto.Migration.Index{table: collection, columns: fields} = index}, _opts)
-      when cmd in [:create, :create_if_not_exists]
+    when cmd in [:create, :create_if_not_exists]
   do
     body = make_index(index)
     Arangoex.Index.create_general(endpoint, collection, Map.put(body, :fields, fields))
   end
 
+  defp execute(endpoint, {cmd, %Ecto.Migration.Index{table: collection, columns: fields} = index}, _opts)
+    when cmd in [:drop, :drop_if_exists]
+  do
+    body = make_index(index)
+      |> Map.put(:fields, fields)
+      |> Poison.encode!()
+      |> Poison.decode!()
+      |> MapSet.new()
+
+    {:ok, %{"error" => false, "indexes" => indexes}} = Arangoex.Index.indexes(endpoint, collection)
+    matching_index = Enum.filter(indexes, &MapSet.subset?(body, MapSet.new(&1)))
+    case {cmd, matching_index} do
+      {_, [index]} -> Arangoex.Index.delete(endpoint, index["id"])
+      {:drop_if_exists, []} -> :ok
+      {:drop, []} -> raise "No index found matching #{inspect index}"
+    end
+  end
+
   defp execute(_, {:alter, _, _}, options) do
     if options[:log], do: Logger.warn "ALTER command has no effect in ArangoDB."
     {:ok, nil}
   end
 
-  defp execute(_, {cmd, _, _}, _) do
-    raise "{inspect __MODULE__}: unspported DDL operation #{inspect cmd}"
+  defp execute(_, cmd, _) do
+    raise "#{inspect __MODULE__}: unspported DDL operation #{inspect cmd}"
   end
 
   #

test/integration/migrator_test.exs

@@ -1 +1,56 @@
-Code.require_file "../../deps/ecto/integration_test/cases/migrator.exs", __DIR__
+Code.require_file "../../deps/ecto/integration_test/cases/migrator.exs", __DIR__
+
+defmodule ArangoDB.Ecto.Integration.MigratorTest do
+
+  use Ecto.Integration.Case
+
+  alias Ecto.Integration.PoolRepo
+  alias Ecto.Migration.SchemaMigration
+
+  import Ecto.Migrator
+
+  setup do
+    PoolRepo.delete_all(SchemaMigration)
+    :ok
+  end
+
+  defmodule CollectionMigration do
+    use Ecto.Migration
+
+    def change do
+      create table(:dummy_collection)
+    end
+  end
+
+  defmodule IndexMigration do
+    use Ecto.Migration
+
+    def change do
+      create index(:posts, :author_id)
+    end
+  end
+
+  test "run and rollback collection migration" do
+    endpoint = ArangoDB.Ecto.Utils.get_endpoint(PoolRepo)
+
+    assert up(PoolRepo, 20100906120000, CollectionMigration, log: false) == :ok
+    {:ok, collections} = Arangoex.Collection.collections(endpoint)
+    assert [_] = collections |> Enum.filter(&match?(%{name: "dummy_collection"}, &1))
+
+    assert down(PoolRepo, 20100906120000, CollectionMigration, log: false) == :ok
+    {:ok, collections} = Arangoex.Collection.collections(endpoint)
+    assert [] = collections |> Enum.filter(&match?(%{name: "dummy_collection"}, &1))
+  end
+
+  test "run and rollback index migration" do
+    endpoint = ArangoDB.Ecto.Utils.get_endpoint(PoolRepo)
+
+    assert up(PoolRepo, 20100906120000, IndexMigration, log: false) == :ok
+    {:ok, %{"error" => false, "indexes" => indexes}} = Arangoex.Index.indexes(endpoint, "posts")
+    assert [_index] = indexes |> Enum.filter(&match?(%{"fields" => ["author_id"]}, &1))
+
+    assert down(PoolRepo, 20100906120000, IndexMigration, log: false) == :ok
+    {:ok, %{"error" => false, "indexes" => indexes}} = Arangoex.Index.indexes(endpoint, "posts")
+    assert [] = indexes |> Enum.filter(&match?(%{"fields" => ["author_id"]}, &1))
+  end
+end