Merge pull request #189 from teloxide/with_payload

Add `HasPayload::with_payload_mut` function

CHANGELOG.md

@@ -10,8 +10,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - `WrongFileIdOrUrl` and `FailedToGetUrlContent` errors ([#188][pr188])
+- `HasPayload::with_payload_mut` function ([#189][pr189])
 
 [pr188]: https://github.com/teloxide/teloxide-core/pull/188
+[pr189]: https://github.com/teloxide/teloxide-core/pull/189
 
 ## 0.4.3 - 2022-03-08
 

src/requests/has_payload.rs

@@ -28,6 +28,16 @@ pub trait HasPayload {
 
     /// Gain immutable access to the underlying payload.
     fn payload_ref(&self) -> &Self::Payload;
+
+    /// Update payload with a function
+    fn with_payload_mut<F>(mut self, f: F) -> Self
+    where
+        Self: Sized,
+        F: FnOnce(&mut Self::Payload),
+    {
+        f(self.payload_mut());
+        self
+    }
 }
 
 impl<P> HasPayload for P