RavenDb : Update a Denormalized Reference property value

Question

I have implemented the RavenDB Denormalized Reference pattern. I am struggling to wire together the static index and the patch update request required to ensure that my denormal

Answer 1

Try changing your line:

RavenSessionProvider.UpdateByIndex(indexName,  //etc

to

db.Advanced.DatabaseCommands.UpdateByIndex(indexName,  //etc

This will ensure that the Update command is issued on the same (Fake) document store that you are using in your unit tests.

Answer to edit 2:

There's no automatic way to wait for non-stale results when using UpdateByIndex. You have a couple of choices in your SetUserName method:

1 - Change your datastore to always update indexes immediately like this (NOTE: this may adversely affect performance):

store.Conventions.DefaultQueryingConsistency = ConsistencyOptions.MonotonicRead;

2 - Run a query against your index, just before the UpdateByIndex call, specifying the WaitForNonStaleResults option:

var dummy = session.Query("Relationships_ByMentorId")
.Customize(x => x.WaitForNonStaleResultsAsOfLastWrite())
.ToArray();

3 - Catch the exception throw when the index is stale, do a Thread.Sleep(100) and retry.

Answer to edit 3:

I've finally figured it out, and have a passing test... can't believe it, but it seems to just have been a caching issue. When you re-load your docs for asserting against, you need to use a different session... e.g.

using (var db = Fake.Db())
{
    const string userName = "updated-mentor-username";
    var mentor = Fake.Mentor(db);
    var mentee = Fake.Mentee(db);
    var relationship = Fake.Relationship(mentor, mentee, db);
    db.Store(mentor);
    db.Store(mentee);
    db.Store(relationship);
    db.SaveChanges();

    MentorService.SetUserName(db, mentor, userName);
}

using (var db = Fake.Db())
{
    relationship = db
        .Include("Mentor.Id")
        .Load(relationship.Id);
    //etc...
}

Can't believe I didn't spot this sooner, sorry.