Amend tests to always include all pagination keys

lib/active_model_serializers/adapter/json_api/pagination_links.rb

@@ -3,6 +3,7 @@ module ActiveModelSerializers
     class JsonApi < Base
       class PaginationLinks
         MissingSerializationContextError = Class.new(KeyError)
+        FIRST_PAGE = 1
 
         attr_reader :collection, :context
 
@@ -42,20 +43,36 @@ module ActiveModelSerializers
           url_for_page(1)
         end
 
+        def last_page_url
+          if collection.total_pages == 0
+            url_for_page(FIRST_PAGE)
+          else
+            url_for_page(collection.total_pages)
+          end
+        end
+
         def prev_page_url
-          return nil if collection.first_page?
+          return nil if collection.current_page == FIRST_PAGE
-          url_for_page(collection.prev_page)
+          url_for_page(collection.current_page - FIRST_PAGE)
         end
 
         def next_page_url
-          return nil if collection.last_page? || collection.out_of_range?
+          return nil if (collection.total_pages == 0 || collection.current_page == collection.total_pages)
           url_for_page(collection.next_page)
         end
 
         def url_for_page(number)
           params = query_parameters.dup
-          params[:page] = { page: per_page, number: number }
+          params[:page] = { size: per_page, number: number }
-          context.url_for(action: :index, params: params)
+          "#{url(adapter_options)}?#{params.to_query}"
+        end
+
+        def url(options = {})
+          @url ||= options.fetch(:links, {}).fetch(:self, nil) || request_url
+        end
+
+        def request_url
+          @request_url ||= context.request_url
         end
 
         def query_parameters

test/action_controller/json_api/pagination_test.rb

@@ -61,6 +61,7 @@ module ActionController
         def test_render_only_first_last_and_next_pagination_links
           expected_links = { 'self' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
                              'first' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
+                             'prev' => nil,
                              'next' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2",
                              'last' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2" }
           get :render_pagination_using_will_paginate, params: { page: { number: 1, size: 2 } }
@@ -83,6 +84,7 @@ module ActionController
           expected_links = { 'self' => "#{KAMINARI_URI}?page%5Bnumber%5D=3&page%5Bsize%5D=1",
                              'first' => "#{KAMINARI_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=1",
                              'prev' => "#{KAMINARI_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=1",
+                             'next' => nil,
                              'last' => "#{KAMINARI_URI}?page%5Bnumber%5D=3&page%5Bsize%5D=1" }
           get :render_pagination_using_kaminari, params: { page: { number: 3, size: 1 } }
           response = JSON.parse(@response.body)
@@ -92,6 +94,7 @@ module ActionController
         def test_render_only_first_last_and_next_pagination_links_with_additional_params
           expected_links = { 'self' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2&teste=additional",
                              'first' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2&teste=additional",
+                             'prev' => nil,
                              'next' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2&teste=additional",
                              'last' => "#{WILL_PAGINATE_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2&teste=additional" }
           get :render_pagination_using_will_paginate, params: { page: { number: 1, size: 2 }, teste: 'additional' }
@@ -103,6 +106,7 @@ module ActionController
           expected_links = { 'self' => "#{KAMINARI_URI}?page%5Bnumber%5D=3&page%5Bsize%5D=1&teste=additional",
                              'first' => "#{KAMINARI_URI}?page%5Bnumber%5D=1&page%5Bsize%5D=1&teste=additional",
                              'prev' => "#{KAMINARI_URI}?page%5Bnumber%5D=2&page%5Bsize%5D=1&teste=additional",
+                             'next' => nil,
                              'last' => "#{KAMINARI_URI}?page%5Bnumber%5D=3&page%5Bsize%5D=1&teste=additional" }
           get :render_pagination_using_kaminari, params: { page: { number: 3, size: 1 }, teste: 'additional' }
           response = JSON.parse(@response.body)

test/adapter/json_api/pagination_links_test.rb

@@ -58,7 +58,9 @@ module ActiveModelSerializers
           {
             self: "#{URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
             first: "#{URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
-            last: "#{URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2"
+            prev: nil,
+            next: nil,
+            last: "#{URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
           }
         end
 
@@ -79,8 +81,9 @@ module ActiveModelSerializers
             links: {
               self: "#{URI}?page%5Bnumber%5D=3&page%5Bsize%5D=2",
               first: "#{URI}?page%5Bnumber%5D=1&page%5Bsize%5D=2",
-              last: "#{URI}?page%5Bnumber%5D=3&page%5Bsize%5D=2",
+              prev: "#{URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2",
-              prev: "#{URI}?page%5Bnumber%5D=2&page%5Bsize%5D=2"
+              next: nil,
+              last: "#{URI}?page%5Bnumber%5D=3&page%5Bsize%5D=2"
             }
           }
         end