RavenDB - Changing the Lo on the HiLo Generator

posted on 24 Oct 2011 | RavenDB

Well I'm currently learning RavenDB, it's awesome! But I noticed when I put data in, all the Id's generated every time I ran up my application to test were:

1, 2, 3, 4, 5...

1024, 1025, 1026, 1027, 1028...

2048, 2049, 2050, 2051, 2052...

This would be fine after the app is deployed since I wouldn't be restarting it over and over and over, but during development I personally find it annoying that the numbers jump so high.

Fortunately I figured out a way. (which about an hour later I found on Google Groups, granted I had to use a different keyword to find it)

Basically you just need to create a new instance of the MultiTypeHiLoKeyGenerator class, passing in the arguments and assigning it to the document store:

var documentStore = (new DocumentStore { 
    Url = "http://localhost:12321/" 

var generator = new MultiTypeHiLoKeyGenerator(documentStore, 10);

documentStore.Conventions.DocumentKeyGenerator = 
    entity => generator.GenerateDocumentKey(documentStore.Conventions, entity);

using (var session = documentStore.OpenSession())
    session.Store(new Project() { Title = "Hello World" });

So running up my app once:

And again:

Now the identity only increases every time the app restarts. And to show it generates more than 1 number...

It took a while of hunting on the net, but it turns out Googling & Binging, or searching (StackOverflow/Google Groups) for the keyword Lo doesn't work, the argument is capacity and searching for that on Google Groups lead me here:


Hopefully someone else finds this useful :)

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