Improve API ergonomics for optional fields

src/dispatcher/builder.rs

@@ -50,9 +50,9 @@ impl DispatcherBuilder {
     #[cfg(not(target_arch = "wasm32"))]
     pub fn proxy<S>(mut self, proxy: S) -> Self
     where
-        S: Into<String>,
+        S: Into<Option<String>>,
     {
-        self.proxy = Some(proxy.into());
+        self.proxy = proxy.into();
         self
     }
 

src/payload/mod.rs

@@ -53,19 +53,20 @@ impl Payload {
     #[inline]
     pub fn title<S>(mut self, title: S) -> Self
     where
-        S: Into<String>,
+        S: Into<Option<String>>,
     {
-        self.title = Some(title.into());
+        self.title = title.into();
         self
     }
 
     /// Set tags
-    pub fn tags<I, S>(mut self, tags: I) -> Self
+    pub fn tags<I, S, P>(mut self, tags: P) -> Self
     where
         I: IntoIterator<Item = S>,
         S: Into<String>,
+        P: Into<Option<I>>,
     {
-        self.tags = Some(tags.into_iter().map(|t| t.into()).collect());
+        self.tags = tags.into().map(|i| i.into_iter().map(Into::into).collect());
         self
     }
 
@@ -77,11 +78,12 @@ impl Payload {
     }
 
     /// Set actions
-    pub fn actions<I>(mut self, actions: I) -> Self
+    pub fn actions<I, P>(mut self, actions: P) -> Self
     where
         I: IntoIterator<Item = Action>,
+        P: Into<Option<I>>,
     {
-        self.actions = Some(actions.into_iter().collect());
+        self.actions = actions.into().map(|i| i.into_iter().collect());
         self
     }
 
@@ -103,29 +105,29 @@ impl Payload {
     #[inline]
     pub fn filename<S>(mut self, filename: S) -> Self
     where
-        S: Into<String>,
+        S: Into<Option<String>>,
     {
-        self.filename = Some(filename.into());
+        self.filename = filename.into();
         self
     }
 
     /// Set delay
     #[inline]
     pub fn delay<S>(mut self, delay: S) -> Self
     where
-        S: Into<String>,
+        S: Into<Option<String>>,
     {
-        self.delay = Some(delay.into());
+        self.delay = delay.into();
         self
     }
 
     /// Set email
     #[inline]
     pub fn email<S>(mut self, email: S) -> Self
     where
-        S: Into<String>,
+        S: Into<Option<String>>,
     {
-        self.email = Some(email.into());
+        self.email = email.into();
         self
     }