Get tags by ID implementation

src/Item.zig

@@ -57,6 +57,21 @@ pub fn persist(self: *Self, db: *sqlite.Db) !void {
     }
 }
 
+pub fn getTagsById(id: i64, db: *sqlite.Db, allocator: std.mem.Allocator) !?[]Tag {
+    var stmt = try db.prepare("SELECT tag, value FROM item_tag WHERE item = ?");
+    defer stmt.deinit();
+
+    const res = try stmt.all(Tag, allocator, .{}, .{ .id = id });
+
+    if (res.len < 1) {
+        // Detect wether it returns 0 because it has no tags or because it doesn't exist
+        const exists = (try db.one(i64, "SELECT COUNT(id) FROM item WHERE id = ?", .{}, .{id})).?;
+        return if (exists == 0) null else res;
+    }
+
+    return res;
+}
+
 /// Convert into a JSON object. A call to deinit() is necessary from the caller's side
 pub fn toJson(self: Self) json.Obj {
     // Main object

src/main.zig

@@ -46,5 +46,8 @@ pub fn main() !void {
     var jobj = item2.toJson();
     defer jobj.deinit();
 
+    const tags = try Item.getTagsById(item2.id.?, &db, allocator);
+    std.debug.print("{any}\n", .{tags});
+
     std.debug.print("{s}\n", .{jobj.toString()});
 }