Custom scopes don't work with Ajax Select

[thisismydesign]

Seems like groupings and custom scopes don't play nice in ransack: activerecord-hackery/ransack#1339

The Ajax select will always structure the query in a grouping:

activeadmin_addons/app/javascript/activeadmin_addons/inputs/search-select.js

Lines 40 to 46 in 51a0e4b

	var query = {
	order: order,
	q: {
	groupings: [textQuery],
	combinator: 'and',
	},
	};

Even in the case of a single parameter. A simple query will look something like this:

Would it be possible not to use groupings unless necessary? As long as custom scopes are passed on top-level this would enable filtering to work with custom scopes. It would also make queries easier to understand. The following are equivalent

{ groupings: [{m: 'or', user_name_contains: 'hug'}, combinator: 'and']}
# vs
{ user_name_contains: 'jov' }

[thisismydesign]

Actually, I'm wondering if groupings is needed at all. For the purposes of this ajax call even in the case of multiple fields isn't these 2 equivalent?

{ groupings: [{m: 'or', field1: 'value', field2: 'value'}, combinator: 'and']}
# vs
{m: 'or', field1: 'value', field2: 'value'}

Perhaps groupings are only needed for nested-select? If so, this part could be simplified & fixed.