fix issue #352: relationships w/o included data

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- [#353](https://github.com/JsonApiClient/json_api_client/pull/353) - fix to support deserializing resources with relationships without those related resources being included in the response (issue [#352](https://github.com/JsonApiClient/json_api_client/issues/352)).
+
 ## 1.14.0
 
 - [#338](https://github.com/JsonApiClient/json_api_client/pull/338) - implement hash and eql? for builder class

lib/json_api_client/included_data.rb

@@ -36,9 +36,7 @@ def data_for(method_name, definition)
 
       if data.is_a?(Array)
         # has_many link
-        data.map do |link_def|
-          record_for(link_def)
-        end
+        data.map(&method(:record_for)).compact
       else
         # has_one link
         record_for(data)
@@ -53,7 +51,8 @@ def has_link?(name)
 
     # should return a resource record of some type for this linked document
     def record_for(link_def)
-      data[link_def["type"]][link_def["id"]]
+      record = data[link_def["type"]]
+      record[link_def["id"]] if record
     end
   end
 end

test/unit/compound_non_included_document_test.rb

@@ -0,0 +1,63 @@
+require 'test_helper'
+
+class CompoundNonIncludedDocumentTest < MiniTest::Test
+
+  TEST_DATA = %{
+    {
+      "links": {
+        "self": "http://example.com/posts",
+        "next": "http://example.com/posts?page[offset]=2",
+        "last": "http://example.com/posts?page[offset]=10"
+      },
+      "data": [{
+        "type": "posts",
+        "id": "1",
+        "attributes": {
+          "title": "JSON API paints my bikeshed!"
+        },
+        "relationships": {
+          "author": {
+            "links": {
+              "self": "http://example.com/posts/1/relationships/author",
+              "related": "http://example.com/posts/1/author"
+            },
+            "data": { "type": "people", "id": "9" }
+          },
+          "comments": {
+            "links": {
+              "self": "http://example.com/posts/1/relationships/comments",
+              "related": "http://example.com/posts/1/comments"
+            },
+            "data": [
+              { "type": "comments", "id": "5" },
+              { "type": "comments", "id": "12" }
+            ]
+          }
+        },
+        "links": {
+          "self": "http://example.com/posts/1"
+        }
+      }]
+    }
+  }
+
+  def test_can_handle_related_data_without_included
+    stub_request(:get, "http://example.com/articles")
+      .to_return(headers: {content_type: "application/vnd.api+json"}, body: TEST_DATA)
+
+    articles = Article.all
+
+    assert articles.is_a?(JsonApiClient::ResultSet)
+    assert_equal 1, articles.length
+
+    article = articles.first
+    assert_equal "1", article.id
+    assert_equal "JSON API paints my bikeshed!", article.title
+
+    # has_one is nil if not included
+    assert_nil article.author
+
+    # has_many is empty if not included
+    assert_equal 0, article.comments.size
+  end
+end