Create custom filter with custom attribute.

custom_filter.rb

```app/models/concerns/active_admin/filter_name.rb```
module ActiveAdmin::FilterName
  extend ActiveSupport::Concern
  included do
    def self.ransackable_scopes(_auth_object = nil)
      %i[attribute_eq]
    end
    def self.attribute_eq(paramater)
      return none unless invalid_parameter

      where('table_name.attribute >= ?', paramater)
    end
  end
end

```app/models/model_name.rb```
class ModelName < ApplicationRecord
  include ActiveAdmin::FilterName
end

``` now you can use the customer filter