Set id when creating Item from JSON

src/Item.zig

@@ -91,11 +91,12 @@ pub fn fromJson(jobj: json.Obj, allocator: std.mem.Allocator) !Self {
     // Try to assemble a Item object from a JSON string
     // An item could be just an id, just tags or both.
 
-    var opt_jtags = jobj.objectGet("tags") catch null;
     var tags: ?[]Tag = null;
 
-    if (opt_jtags) |*jtags| {
+    if (jobj.objectGet("tags") catch null) |*jtags| {
         defer jtags.deinit();
+
+        // Reserve space for slice of tags
         const len = @intCast(usize, jtags.objectLen());
         tags = try allocator.alloc(Tag, len);
 
@@ -111,8 +112,19 @@ pub fn fromJson(jobj: json.Obj, allocator: std.mem.Allocator) !Self {
         }
     }
 
+    var id: ?i64 = null;
+
+    if (jobj.objectGet("id") catch null) |*jid| {
+        defer jid.deinit();
+
+        id = jid.getInt64();
+    }
+
+    // TODO: What should be done when both things are null?
+    //       Return a null Obj or leave it as-is?
+
     return Self{
-        .id = null,
+        .id = id,
         .tags = tags,
         .allocator = allocator,
     };

src/json.zig

@@ -56,6 +56,10 @@ pub const Obj = struct {
         // TODO: Check type to not allow other types
         return std.mem.sliceTo(c.json_object_get_string(self.obj), 0);
     }
+    pub fn getInt64(self: Obj) i64 {
+        // TODO: Check ERRNO to see if there was an error
+        return c.json_object_get_int64(self.obj);
+    }
 
     pub fn deinit(self: *Obj) void {
         _ = c.json_object_put(self.obj);