From 2b20fc0f4f6574f59dae402ccf0ed050c6790b43 Mon Sep 17 00:00:00 2001
From: Gwynne Raskind <gwynne@vapor.codes>
Date: Mon, 10 Jul 2023 23:29:58 -0500
Subject: [PATCH] Add SQLite support for nested subpath (JSON) expressions
 (#104)

Implement the new SQLDialect.nestedSubpathExpression(in:for:) method for SQLite syntax.
---
 Package.swift                         | 2 +-
 Sources/SQLiteKit/SQLiteDialect.swift | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Package.swift b/Package.swift
index 0ebb906..dabd6c0 100644
--- a/Package.swift
+++ b/Package.swift
@@ -14,7 +14,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/vapor/sqlite-nio.git", from: "1.2.0"),
-        .package(url: "https://github.com/vapor/sql-kit.git", from: "3.19.0"),
+        .package(url: "https://github.com/vapor/sql-kit.git", from: "3.28.0"),
         .package(url: "https://github.com/vapor/async-kit.git", from: "1.14.0"),
     ],
     targets: [
diff --git a/Sources/SQLiteKit/SQLiteDialect.swift b/Sources/SQLiteKit/SQLiteDialect.swift
index 411d3b4..5e5a31a 100644
--- a/Sources/SQLiteKit/SQLiteDialect.swift
+++ b/Sources/SQLiteKit/SQLiteDialect.swift
@@ -34,6 +34,15 @@ public struct SQLiteDialect: SQLDialect {
         return nil
     }
 
+    public func nestedSubpathExpression(in column: any SQLExpression, for path: [String]) -> (any SQLExpression)? {
+        guard !path.isEmpty else { return nil }
+        
+        return SQLFunction("json_extract", args: [
+            column,
+            SQLLiteral.string("$.\(path.joined(separator: "."))")
+        ])
+    }
+
     public init() { }
     
     private func isAtLeastVersion(_ major: Int, _ minor: Int, _ patch: Int) -> Bool {