Unique fields

[faisalnjs]

It would be nice to set a field in a model as unique, meaning that all items must have a different value of the field. For example, I have an item with a field with the value "Hello". Currently, I can create another item with the same value in the same field, and it's fine. This is conflicting as I do not more than one item with the same names. This could be used for slugs, tokens, etc. that must be unique from the rest items in the collection. Thoughts?