Entity validation with IStoreListener

[Håkan Edling]

Hi there! I read the suggestion in this blog post (http://ayende.com/blog/159042/handling-entities-validations-in-ravendb) to wire up entity validations from the IStoreListener, and it seems like a great idea. However, I have another question regarding it. In some cases I need to perform a database lookup in the validation to ensure uniqueness of a certain member in the document (like a unique constraint). For example, I have the following in my repository for validation:

// Some regular validation

if (String.IsNullOrWhiteSpace(model.NewUrl))

    errors.Add(new ModelError("NewUrl", ModelError.ErrorType.Required, "NewUrl is required"));

else if (model.NewUrl.Length > 255)

    errors.Add(new ModelError("NewUrl", ModelError.ErrorType.StringLength, "NewUrl has a maximum length of 255 characters"));

// Validate uniqueness of member

if (session.Get<Models.Alias>(where: a => a.OldUrl == model.OldUrl && a.Id != model.Id).Count() > 0)

    errors.Add(new ModelError("OldUrl", ModelError.ErrorType.Duplicate, "Duplicate URL found"));

So my question is, is there anyway to get a hold of the current session in the BeforeStore method, or do you have any other suggestions? Making OldUrl document key does not count, as it doesn't work in this case ;)

Regards

/ Håkan

[Kijana Woodard]

You've already looked at http://ravendb.net/docs/2.5/server/extending/bundles/unique-constraints and http://ravendb.net/docs/2.0/faq/unique-constraints?

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[Håkan Edling]

No I hadn't actually! Thanks!

Regards

/Håkan