Move into Item the json serialization

src/Db.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const sqlite = @import("sqlite");
 
 // TODO: Make DB an object so we can just do Self.
+// TODO: Wrap into transactions with a .flush() method
 
 const ObjectError = error{
     IncompatibleObjectType, // No ?u32 "id" field

src/Item.zig

@@ -1,6 +1,9 @@
 const std = @import("std");
+
+const json = @import("json.zig");
 const Db = @import("Db.zig");
 const sqlite = @import("sqlite");
+
 const Self = @This();
 
 pub const Tag = struct{
@@ -52,3 +55,28 @@ pub fn persist(self: *Self, db: *sqlite.Db) !void {
     }
 
 }
+
+/// Convert into a JSON object. A call to deinit() is necessary from the caller's side
+pub fn toJson(self: Self) json.Obj {
+    var jobj = json.Obj.newObject();
+
+    jobj.objectAdd("id", &json.Obj.newInt64(self.id.?));
+
+    var jtags = json.Obj.newObject();
+    jobj.objectAdd("tags", &jtags);
+
+    // If there are tags there's no point on continuing
+
+    if (self.tags) |tags| {
+        for (tags) |tag_i| {
+            const jtag = if (tag_i.value) |value|
+                &json.Obj.newString(value)
+            else
+                null;
+
+            jtags.objectAdd(tag_i.name, jtag);
+        }
+    }
+
+    return jobj;
+}

src/main.zig

@@ -1,7 +1,6 @@
 const std = @import("std");
 const sqlite = @import("sqlite");
 
-const json = @import("json.zig");
 const Db = @import("Db.zig");
 const Item = @import("Item.zig");
 const Tag = @import("Tag.zig");
@@ -22,24 +21,9 @@ pub fn main() !void {
 
     try item.persist(&db);
 
-    var jobj = json.Obj.newObject();
+    var jobj = item.toJson();
-
-    jobj.objectAdd("id", &json.Obj.newInt64(item.id.?));
-
-    var jtags = json.Obj.newObject();
-    jobj.objectAdd("tags", &jtags);
-
-
-    for (tags) |tag_i| {
-        const jtag = if (tag_i.value) |value|
-            &json.Obj.newString(value)
-        else
-            null;
-
-        jtags.objectAdd(tag_i.name, jtag);
-    }
-
     defer jobj.deinit();
+
     _ = alloc;
 
     std.debug.print("{s}\n", .{jobj.toString()});