feat: with items

Signed-off-by: kjuulh <contact@kjuulh.io>

como_domain/src/common/user.rs

@@ -0,0 +1,23 @@
+use crate::Context;
+
+pub trait ContextUserExt {
+    fn set_user_id(&self, user_id: impl Into<String>) -> Context;
+    fn set_user_id_mut(&mut self, user_id: impl Into<String>) -> &mut Context;
+    fn get_user_id(&self) -> Option<String>;
+}
+
+const USER_ID_KEY: &str = "user_id";
+
+impl ContextUserExt for Context {
+    fn set_user_id(&self, user_id: impl Into<String>) -> Context {
+        self.with_value(USER_ID_KEY, user_id)
+    }
+
+    fn set_user_id_mut(&mut self, user_id: impl Into<String>) -> &mut Context {
+        self.with_value_mut(USER_ID_KEY, user_id)
+    }
+
+    fn get_user_id(&self) -> Option<String> {
+        self.get(USER_ID_KEY).map(|s| s.to_string())
+    }
+}