Create a custom dql function to build json object (JSON_BUILD_OBJECT)

src/Bundle/ChillMainBundle/Doctrine/DQL/JsonBuildObject.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Doctrine\DQL;
+
+use Doctrine\ORM\Query\AST\Functions\FunctionNode;
+use Doctrine\ORM\Query\AST\Node;
+use Doctrine\ORM\Query\Lexer;
+use Doctrine\ORM\Query\Parser;
+use Doctrine\ORM\Query\SqlWalker;
+
+/**
+ * Return an aggregation of values in a json representation, as a string.
+ *
+ * Internally, this function use the postgresql `jsonb_agg` function. Using
+ * json allow to aggregate data from different types without have to cast them.
+ */
+class JsonBuildObject extends FunctionNode
+{
+    /**
+     * @var array|Node[]
+     */
+    private array $exprs = [];
+
+    public function getSql(SqlWalker $sqlWalker)
+    {
+        return 'JSONB_BUILD_OBJECT(' . implode(', ', array_map(static fn (Node $expr) => $expr->dispatch($sqlWalker), $this->exprs)) . ')';
+    }
+
+    public function parse(Parser $parser)
+    {
+        $lexer = $parser->getLexer();
+        $parser->match(Lexer::T_IDENTIFIER);
+        $parser->match(Lexer::T_OPEN_PARENTHESIS);
+
+        $this->exprs[] = $parser->ArithmeticPrimary();
+
+        while (Lexer::T_COMMA === $lexer->lookahead['type']) {
+            $parser->match(Lexer::T_COMMA);
+            $this->exprs[] = $parser->ArithmeticPrimary();
+        }
+
+        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
+    }
+}