#6 Multiple selection (state: open)

I miss multiple selection in country and langcode attribute. Is it possible to make something of this? Thanks.

Nope, not really. The reason for these attributes is to attach a country code and a language code to some dataset which then come in handy when defining filters. For what reason do you need to use languages or country codes as "tags"? This would each be a new type of attributes.

You got a point about filters, but's it's immposible to filters works on serialise data? Example: you have product which is available in couple of country, or for my example I have country where there is info about for which country visa can be used (you have to select 20+ countries). Tnx for answare.

Using serialized data is pretty bad practice as it is time consuming when searching for values and therefore slows down the whole system. Maybe we will implement a "countrytag" attribute (or anything with a name like that) which will allow you to select multiple countries but at the very moment I do lack the time to implement it. Feel free to write it on your own and donate it to MetaModels though.