return complete URIs on pagination links

lib/active_model/serializer/adapter/json_api.rb

@@ -29,7 +29,7 @@ module ActiveModel
               end
             end
 
-            include_pagination_links if serializer.pagination
+            include_pagination_links if serializer.options[:pagination]
           else
             @hash[:data] = attributes_for_serializer(serializer, options)
             add_resource_relationships(@hash[:data], serializer)
@@ -168,7 +168,7 @@ module ActiveModel
         end
 
         def page_links
-          @links ||= JsonApi::PaginationLinks.new(serializer.resource).page_links
+          @links ||= JsonApi::PaginationLinks.new(serializer.resource, serializer.options).page_links
         end
 
         def links?

lib/active_model/serializer/adapter/json_api/pagination_links.rb

@@ -5,11 +5,12 @@ module ActiveModel
         class PaginationLinks
           FIRST_PAGE = 1
 
-          attr_reader :collection
+          attr_reader :collection, :options
 
-          def initialize(collection)
+          def initialize(collection, options={})
             raise_unless_any_gem_installed
             @collection = collection
+            @options = options
           end
 
           def page_links
@@ -20,7 +21,7 @@ module ActiveModel
 
           def build_links
             pages_from.each_with_object({}) do |(key, value), hash|
-              hash[key] = "?page=#{value}&per_page=#{collection.size}"
+              hash[key] = "#{url}?page=#{value}&per_page=#{collection.size}"
             end
           end
 
@@ -45,6 +46,15 @@ module ActiveModel
             raise "AMS relies on either Kaminari or WillPaginate." +
               "Please install either dependency by adding one of those to your Gemfile"
           end
+
+          def url
+            return default_url unless options && options[:links] && options[:links][:self]
+            options[:links][:self]
+          end
+
+          def default_url
+            options[:original_url]
+          end
         end
       end
     end