Yes, I need validate the custom input value is unique in database before save the form.

My solution is:

1. Add operation Repository.ResultSetQuery
2. Add listener on input: ``` this.$.
3. Execute query then validate is unique value.

:)

Thanks.

Hello,

This uniqueness check should be done on the Polymer part (when validating a form for example).

Do you want to check uniqueness in a complex multivalued property? In the search results?

Thx