Add Sort::hasFieldInConfig()

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Chg #159: Replace `withNextPageToken()` and `withPreviousPageToken()` of `PaginatorInterface` with `withToken()`,
   `getNextPageToken()` with `getNextToken()`, `getPreviousPageToken()` with `getPreviousToken()`, and add `getToken()`.
   These methods use new `PageToken` class (@vjik)
+- New #160: Add `Sort::hasFieldInConfig()` method that checks for the presence of a field in the sort config (@vjik)
 
 ## 1.0.1 January 25, 2023
 

src/Reader/Sort.php

@@ -330,4 +330,14 @@ public function getCriteria(): array
 
         return $criteria;
     }
+
+    /**
+     * @param string $name The field name.
+     *
+     * @return bool Whether the field is present in the config.
+     */
+    public function hasFieldInConfig(string $name): bool
+    {
+        return isset($this->config[$name]);
+    }
 }

tests/Reader/SortTest.php

@@ -333,4 +333,13 @@ public function testPrepareConfig(array $expected, array $config): void
         $sort = Sort::only($config);
         $this->assertSame($expected, $sort->getCriteria());
     }
+
+    public function testHasFieldInConfig(): void
+    {
+        $sort = Sort::only(['a', 'b']);
+
+        $this->assertTrue($sort->hasFieldInConfig('a'));
+        $this->assertTrue($sort->hasFieldInConfig('b'));
+        $this->assertFalse($sort->hasFieldInConfig('c'));
+    }
 }