Validator for "in" where clause and integration with Rails 4

[ka8725]

List of checkboxes for form helper generates array of params like this (I don't select any checkbox and use "id_in" predicate):

[""]

Validator pass them and gem generates wrong select like this:

select * from smth where id in (NULL)

So my changes fix this issue

[pechorin]

merge this patch please :))

[ka8725]

It seems that @ernie has no longer supported this gem - the last change was 1 year ago

[ka8725]

Added integration with rails 4