Taxonomy: Ensure the child_of argument of get_terms() works as expected with 'fields' => 'id=>name' or 'id=>slug'.

Props Howdy_McGee, deepaklalwani, planvova.
Fixes #46768.

git-svn-id: https://develop.svn.wordpress.org/trunk@48663 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-term-query.php

@@ -620,10 +620,10 @@ class WP_Term_Query {
 				$selects = array( 'COUNT(*)' );
 				break;
 			case 'id=>name':
-				$selects = array( 't.term_id', 't.name', 'tt.count', 'tt.taxonomy' );
+				$selects = array( 't.term_id', 't.name', 'tt.parent', 'tt.count', 'tt.taxonomy' );
 				break;
 			case 'id=>slug':
-				$selects = array( 't.term_id', 't.slug', 'tt.count', 'tt.taxonomy' );
+				$selects = array( 't.term_id', 't.slug', 'tt.parent', 'tt.count', 'tt.taxonomy' );
 				break;
 		}
 

tests/phpunit/tests/term/getTerms.php

@@ -719,6 +719,83 @@ class Tests_Term_getTerms extends WP_UnitTestCase {
 		$this->assertEquals( 1, count( $terms ) );
 	}
 
+	/**
+	 * @ticket 46768
+	 */
+	function test_get_terms_child_of_fields_id_name() {
+		$parent = self::factory()->category->create();
+		$child  = self::factory()->category->create(
+			array(
+				'parent' => $parent,
+				'slug'   => 'test-1',
+				'name'   => 'Test 1',
+			)
+		);
+		$child2 = self::factory()->category->create(
+			array(
+				'parent' => $parent,
+				'slug'   => 'test-2',
+				'name'   => 'Test 2',
+			)
+		);
+
+		$terms = get_terms(
+			'category',
+			array(
+				'child_of'   => $parent,
+				'hide_empty' => false,
+				'fields'     => 'id=>name',
+			)
+		);
+
+		$this->assertEquals(
+			array(
+				$child  => 'Test 1',
+				$child2 => 'Test 2',
+			),
+			$terms
+		);
+
+	}
+
+	/**
+	 * @ticket 46768
+	 */
+	function test_get_terms_child_of_fields_id_slug() {
+		$parent = self::factory()->category->create();
+		$child  = self::factory()->category->create(
+			array(
+				'parent' => $parent,
+				'slug'   => 'test-1',
+				'name'   => 'Test 1',
+			)
+		);
+		$child2 = self::factory()->category->create(
+			array(
+				'parent' => $parent,
+				'slug'   => 'test-2',
+				'name'   => 'Test 2',
+			)
+		);
+
+		$terms = get_terms(
+			'category',
+			array(
+				'child_of'   => $parent,
+				'hide_empty' => false,
+				'fields'     => 'id=>slug',
+			)
+		);
+
+		$this->assertEquals(
+			array(
+				$child  => 'test-1',
+				$child2 => 'test-2',
+			),
+			$terms
+		);
+	}
+
 	/**
 	 * @ticket 31118
 	 */