fix: fixes a typo which blocks the correct behaviour of retryable_writes: true (#287)

Author: zookzook

lib/mongo/session.ex

@@ -393,9 +393,9 @@ defmodule Mongo.Session do
   end
 
   def init(topology, conn, address, server_session, wire_version, opts) do
-    ## in case of `:retryable_write` we need to inc the transaction id
+    ## in case of `:retryable_writes` we need to inc the transaction id
     server_session =
-      case opts[:retryable_write] do
+      case opts[:retryable_writes] do
         true -> ServerSession.next_txn_num(server_session)
         _ -> server_session
       end

test/mongo/retryable_writes_test.exs

@@ -42,4 +42,15 @@ defmodule Mongo.RetryableWritesTest do
 
     assert [:delete | _] = EventCatcher.retry_write_events(catcher) |> Enum.map(fn event -> event.command_name end)
   end
+
+  test "retryable writes: replace one", %{pid: top} do
+    coll = unique_collection()
+
+    assert {:ok, %Mongo.InsertOneResult{acknowledged: true, inserted_id: 42}} = Mongo.insert_one(top, coll, %{"_id" => 42, "name" => "Waldo"}, retryable_writes: true)
+    assert %{"_id" => 42, "name" => "Waldo"} = Mongo.find_one(top, coll, %{"_id" => 42})
+    assert {:ok, %Mongo.UpdateResult{acknowledged: true, matched_count: 1, modified_count: 1}} = Mongo.replace_one(top, coll, %{"_id" => 42}, %{"_id" => 42, "name" => "Greta"}, retryable_writes: true)
+    assert %{"_id" => 42, "name" => "Greta"} = Mongo.find_one(top, coll, %{"_id" => 42})
+    assert {:ok, %Mongo.UpdateResult{acknowledged: true, matched_count: 1, modified_count: 1}} = Mongo.replace_one(top, coll, %{"_id" => 42}, %{"_id" => 42, "name" => "Merlin"}, retryable_writes: true)
+    assert %{"_id" => 42, "name" => "Merlin"} = Mongo.find_one(top, coll, %{"_id" => 42})
+  end
 end