add tests about link check for nested resource routes

test/fixtures/active_record.rb

@@ -643,6 +643,18 @@ class AuthorsController < JSONAPI::ResourceController
 end
 
 ### CONTROLLERS
+module NestedApi
+  class PostsController < ActionController::Base
+    include JSONAPI::ActsAsResourceController
+    def context
+      {writer_id: params[:writer_id]}
+    end
+  end
+  class WritersController < ActionController::Base
+    include JSONAPI::ActsAsResourceController
+  end
+end
+
 module Api
   module V1
     class AuthorsController < JSONAPI::ResourceController
@@ -1208,6 +1220,23 @@ def custom_links(options)
   end
 end
 
+module NestedApi
+  class WriterResource < JSONAPI::Resource
+    attributes :name
+    model_name 'Person'
+    has_many :posts
+  end
+
+  class PostResource < JSONAPI::Resource
+    attributes :title, :body
+    has_one :writer, foreign_key: 'author_id', class_name: 'Writer'
+
+    def self.records(options = {})
+      context = options.fetch(:context, {})
+      super.where(author_id: context[:writer_id])
+    end
+  end
+end
 
 module Api
   module V1

test/integration/requests/request_test.rb

@@ -493,6 +493,54 @@ def test_pagination_empty_results
   #   assert_equal 'This is comment 18 on book 1.', json_response['data'][9]['attributes']['body']
   # end
 
+  def test_nested_route_relation_links
+    original_config = JSONAPI.configuration.dup
+    JSONAPI.configuration.json_key_format = :underscored_key
+    JSONAPI.configuration.route_format = :underscored_route
+
+    get "/nested_api/writers/#{$test_user.id}/posts"
+    assert_jsonapi_response 200
+    post_1 = json_response['data'][0]
+    assert_hash_equals({
+                           'self' => "http://www.example.com/nested_api/writers/#{$test_user.id}/posts/#{post_1['id']}/relationships/writer",
+                           'related' => "http://www.example.com/nested_api/writers/#{$test_user.id}"
+                       }, post_1['relationships']['writer']['links'])
+  ensure
+    JSONAPI.configuration = original_config
+  end
+
+  def test_nested_route_pagination_links
+    original_config = JSONAPI.configuration.dup
+    JSONAPI.configuration.json_key_format = :underscored_key
+    JSONAPI.configuration.route_format = :underscored_route
+    NestedApi::PostResource.paginator :paged
+
+    get "/nested_api/writers/#{$test_user.id}/posts?page[size]=1"
+    assert_jsonapi_response 200
+    assert_hash_equals({
+                           'first' => "http://www.example.com/nested_api/writers/#{$test_user.id}/posts?page%5Bnumber%5D=1&page%5Bsize%5D=1",
+                           'next' =>  "http://www.example.com/nested_api/writers/#{$test_user.id}/posts?page%5Bnumber%5D=2&page%5Bsize%5D=1",
+                           'last' =>  "http://www.example.com/nested_api/writers/#{$test_user.id}/posts?page%5Bnumber%5D=3&page%5Bsize%5D=1"
+                       }, json_response['links'])
+  ensure
+    JSONAPI.configuration = original_config
+  end
+
+  def test_nested_route_self_links
+    original_config = JSONAPI.configuration.dup
+    JSONAPI.configuration.json_key_format = :underscored_key
+    JSONAPI.configuration.route_format = :underscored_route
+
+    get "/nested_api/writers/#{$test_user.id}/posts"
+    assert_jsonapi_response 200
+    post_1 = json_response['data'][0]
+    assert_hash_equals({
+                           'self' => "http://www.example.com/nested_api/writers/#{$test_user.id}/posts/#{post_1['id']}"
+                       }, post_1['links'])
+  ensure
+    JSONAPI.configuration = original_config
+  end
+
 
   def test_flow_self
     get '/posts'
@@ -504,6 +552,28 @@ def test_flow_self
     assert_hash_equals post_1, json_response['data']
   end
 
+  def test_flow_link_to_one_self_link_for_nested_resources
+    original_config = JSONAPI.configuration.dup
+    JSONAPI.configuration.json_key_format = :underscored_key
+    JSONAPI.configuration.route_format = :underscored_route
+
+    get "/nested_api/writers/#{$test_user.id}/posts"
+    assert_jsonapi_response 200
+    post_1 = json_response['data'][0]
+
+    get post_1['relationships']['writer']['links']['self']
+    assert_jsonapi_response 200
+    assert_hash_equals({
+        'links' => {
+            'self' => "http://www.example.com/nested_api/writers/#{$test_user.id}/posts/#{post_1['id']}/relationships/writer",
+            'related' => "http://www.example.com/nested_api/writers/#{$test_user.id}"
+        },
+        'data' => {type: 'people', id: $test_user.id.to_s}
+    }, json_response)
+  ensure
+    JSONAPI.configuration = original_config
+  end
+
   def test_flow_link_to_one_self_link
     get '/posts'
     assert_jsonapi_response 200

test/test_helper.rb

@@ -149,6 +149,12 @@ class CatResource < JSONAPI::Resource
   jsonapi_resources :books
   jsonapi_resources :authors
 
+  namespace :nested_api do
+    jsonapi_resources :writers do
+      jsonapi_resources :posts
+    end
+  end
+
   namespace :api do
     namespace :v1 do
       jsonapi_resources :people