Replace partially different array when creating merge patch

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.7.3] - 2020-01-24
+
+### Fixed
+- Merge patch was not replacing partially different arrays.
+
 ## [3.7.2] - 2019-10-23
 
 ### Added
@@ -30,6 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Compatibility option to `TOLERATE_ASSOCIATIVE_ARRAYS` that mimic JSON objects.
 
+[3.7.3]: https://github.com/swaggest/json-diff/compare/v3.7.2...v3.7.3
 [3.7.2]: https://github.com/swaggest/json-diff/compare/v3.7.1...v3.7.2
 [3.7.1]: https://github.com/swaggest/json-diff/compare/v3.7.0...v3.7.1
 [3.7.0]: https://github.com/swaggest/json-diff/compare/v3.6.0...v3.7.0

src/JsonDiff.php

@@ -323,6 +323,7 @@ private function process($original, $new)
         }
 
         $isUriFragment = (bool)($this->options & self::JSON_URI_FRAGMENT_ID);
+        $diffCnt = $this->addedCnt + $this->modifiedCnt + $this->removedCnt;
         foreach ($originalKeys as $key => $originalValue) {
             if ($this->options & self::STOP_ON_DIFF) {
                 if ($this->modifiedCnt || $this->addedCnt || $this->removedCnt) {
@@ -366,6 +367,10 @@ private function process($original, $new)
             $this->pathItems = $pathItems;
         }
 
+        if ($merge && $isArray && $this->addedCnt + $this->modifiedCnt + $this->removedCnt > $diffCnt) {
+            JsonPointer::add($this->merge, $this->pathItems, $new);
+        }
+
         // additions
         foreach ($newArray as $key => $value) {
             $this->addedCnt++;

tests/assets/merge.json

@@ -0,0 +1,30 @@
+{
+    "key1": [
+        5,
+        1,
+        2,
+        3
+    ],
+    "key2": null,
+    "key3": {
+        "sub0": null,
+        "sub1": "c",
+        "sub2": false,
+        "sub3": 0
+    },
+    "key4": [
+        {
+            "c": false,
+            "a": 2
+        },
+        {
+            "a": 1,
+            "b": true
+        },
+        {
+            "c": 1,
+            "a": 3
+        }
+    ],
+    "key5": "wat"
+}

tests/src/MergePatchTest.php

@@ -289,5 +289,20 @@ protected function doTest($case)
 
     }
 
+    public function testComplex()
+    {
+        $original = json_decode(file_get_contents(__DIR__ . '/../assets/original.json'));
+        $new = json_decode(file_get_contents(__DIR__ . '/../assets/new.json'));
+
+        $diff = new JsonDiff($original, $new);
+        $mergePatch = $diff->getMergePatch();
+        $mergePatchJson = json_encode($mergePatch, JSON_UNESCAPED_SLASHES + JSON_PRETTY_PRINT);
+
+        $this->assertEquals(file_get_contents(__DIR__ . '/../assets/merge.json') , $mergePatchJson);
+
+        JsonMergePatch::apply($original, $mergePatch);
+        $this->assertEquals($new, $original);
+    }
+
 
 }