How to filter IS NULL in ActiveAdmin?

Question

I\'ve a table with an integer column called \"map_id\", I want to add an activeadmin filter to filter if this column IS NULL or IS NOT NULL.

How could this be implem

Answer 1

seems search_method doesn't work in recent rails version, here is another solution:

add scope to your model:

  scope :field_blank, -> { where "field is null" }
  scope :field_not_blank, -> { where "field is not null" } 

add to /app/admin/[YOUR MODEL]

   scope :field_blank
   scope :field_not_blank

you will see buttons for these scopes appear (in top section, under model name, not in filter section)