Add support for Active Admin 3.0

Author: alexplatteeuw

activeadmin-searchable_select.gemspec

@@ -35,7 +35,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'semmy', '~> 1.0'
   spec.add_development_dependency 'sprockets', '~> 3.7'
 
-  spec.add_runtime_dependency 'activeadmin', ['>= 1.x', '< 3']
+  spec.add_runtime_dependency 'activeadmin', ['>= 1.x', '< 4']
   spec.add_runtime_dependency 'jquery-rails', ['>= 3.0', '< 5']
   spec.add_runtime_dependency 'select2-rails', '~> 4.0'
 end

spec/support/models.rb

@@ -4,13 +4,21 @@ class User < ActiveRecord::Base; end
 
 class Category < ActiveRecord::Base
   belongs_to :created_by, class_name: 'User'
+
+  def self.ransackable_attributes(_auth_object = nil)
+    ['name']
+  end
 end
 
 class Post < ActiveRecord::Base
   belongs_to :category
   belongs_to :user
 
   scope(:published, -> { where(published: true) })
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w(category_id title)
+  end
 end
 
 module RGB
@@ -24,13 +32,21 @@ module Internal
   class TagName < ActiveRecord::Base
     self.table_name = :internal_tag_names
     belongs_to :color, class_name: 'RGB::Color', foreign_key: :color_id
+
+    def self.ransackable_attributes(_auth_object = nil)
+      ['color_id']
+    end
   end
 end
 
 class OptionType < ActiveRecord::Base; end
 
 class OptionValue < ActiveRecord::Base
   belongs_to :option_type
+
+  def self.ransackable_attributes(_auth_object = nil)
+    ['value']
+  end
 end
 
 class Product < ActiveRecord::Base