def column_for_attribute(name)
      filter = self.class.filters[name]
      FilterColumn.intern(filter.database_column_type) if filter
    end
def column_for_attribute(name)
      filter = self.class.filters[name]
      FilterColumn.intern(filter.database_column_type) if filter
    end
Returns the column object for the named filter.

 @param name [Symbol] The name of a filter.

 @example
   class Interaction < ActiveInteraction::Base
     string :email, default: nil

     def execute; end
   end

   Interaction.new.column_for_attribute(:email)
   # => #<ActiveInteraction::FilterColumn:0x007faebeb2a6c8 @type=:string>

   Interaction.new.column_for_attribute(:not_a_filter)
   # => nil

 @return [FilterColumn, nil]

 @since 1.2.0