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Alex Rivera
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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 implemented ? I tried the following filter filter :map_id, :label => 'Assigned', :as => :select, :collection => {:true => nil, :false => ''} But, I get the following error message : undefined method `map_eq' for #
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