Add field_original_name and field_alias to LookAheadMethods (#1199)

Co-authored-by: Kai Ren <tyranron@gmail.com>

Author: soerenmeier

juniper/CHANGELOG.md

@@ -65,6 +65,7 @@ All user visible changes to `juniper` crate will be documented in this file. Thi
 - [`rust_decimal` crate] integration behind `rust_decimal` [Cargo feature]. ([#1060])
 - `js` [Cargo feature] enabling `js-sys` and `wasm-bindgen` support for `wasm32-unknown-unknown` target. ([#1118], [#1147])
 - `LookAheadMethods::applies_for()` method. ([#1138], [#1145])
+- `LookAheadMethods::field_original_name()` and `LookAheadMethods::field_alias()` methods. ([#1199])
 
 ### Changed
 
@@ -126,6 +127,7 @@ All user visible changes to `juniper` crate will be documented in this file. Thi
 [#1188]: /../../pull/1188
 [#1190]: /../../pull/1190
 [#1193]: /../../pull/1193
+[#1199]: /../../pull/1199
 [#1203]: /../../pull/1203
 [ba1ed85b]: /../../commit/ba1ed85b3c3dd77fbae7baf6bc4e693321a94083
 [CVE-2022-31173]: /../../security/advisories/GHSA-4rx6-g5vg-5f3j

juniper/src/executor/look_ahead.rs

@@ -333,44 +333,60 @@ pub struct ConcreteLookAheadSelection<'a, S: 'a> {
 /// `'sel` lifetime is intended to point to the data that this `LookAheadSelection` (or
 /// `ConcreteLookAheadSelection`) points to.
 pub trait LookAheadMethods<'sel, S> {
-    /// Get the (potentially aliased) name of the field represented by the current selection
+    /// Returns the original name of the field, represented by the current selection.
+    fn field_original_name(&self) -> &'sel str;
+
+    /// Returns the alias of the field, represented by the current selection, if any.
+    fn field_alias(&self) -> Option<&'sel str>;
+
+    /// Returns the (potentially aliased) name of the field, represented by the current selection.
     fn field_name(&self) -> &'sel str;
 
-    /// Get the the child selection for a given field
-    /// If a child has an alias, it will only match if the alias matches `name`
+    /// Returns the child selection for the specified field.
+    ///
+    /// If a child has an alias, it will only match if the alias matches the specified `name`.
     fn select_child(&self, name: &str) -> Option<&Self>;
 
-    /// Check if a given child selection with a name exists
-    /// If a child has an alias, it will only match if the alias matches `name`
+    /// Checks if a child selection with the specified `name` exists.
+    ///
+    /// If a child has an alias, it will only match if the alias matches the specified `name`.
     fn has_child(&self, name: &str) -> bool {
         self.select_child(name).is_some()
     }
 
-    /// Does the current node have any arguments?
+    /// Indicates whether the current node has any arguments.
     fn has_arguments(&self) -> bool;
 
-    /// Does the current node have any children?
+    /// Indicates whether the current node has any children.
     fn has_children(&self) -> bool;
 
-    /// Get the top level arguments for the current selection
+    /// Returns the top level arguments from the current selection.
     fn arguments(&self) -> &[LookAheadArgument<S>];
 
-    /// Get the top level argument with a given name from the current selection
+    /// Returns the top level argument with the specified `name` from the current selection.
     fn argument(&self, name: &str) -> Option<&LookAheadArgument<S>> {
         self.arguments().iter().find(|a| a.name == name)
     }
 
-    /// Get the (possibly aliased) names of the top level children for the current selection
+    /// Returns the (possibly aliased) names of the top level children from the current selection.
     fn child_names(&self) -> Vec<&'sel str>;
 
-    /// Get an iterator over the children for the current selection
+    /// Returns an [`Iterator`] over the children from the current selection.
     fn children(&self) -> Vec<&Self>;
 
-    /// Get the parent type in case there is any for this selection
+    /// Returns the parent type, in case there is any for the current selection.
     fn applies_for(&self) -> Option<&str>;
 }
 
 impl<'a, S> LookAheadMethods<'a, S> for ConcreteLookAheadSelection<'a, S> {
+    fn field_original_name(&self) -> &'a str {
+        self.name
+    }
+
+    fn field_alias(&self) -> Option<&'a str> {
+        self.alias
+    }
+
     fn field_name(&self) -> &'a str {
         self.alias.unwrap_or(self.name)
     }
@@ -408,6 +424,14 @@ impl<'a, S> LookAheadMethods<'a, S> for ConcreteLookAheadSelection<'a, S> {
 }
 
 impl<'a, S> LookAheadMethods<'a, S> for LookAheadSelection<'a, S> {
+    fn field_original_name(&self) -> &'a str {
+        self.name
+    }
+
+    fn field_alias(&self) -> Option<&'a str> {
+        self.alias
+    }
+
     fn field_name(&self) -> &'a str {
         self.alias.unwrap_or(self.name)
     }
@@ -1419,6 +1443,8 @@ query Hero {
             )
             .unwrap();
 
+            assert_eq!(look_ahead.field_original_name(), "hero");
+            assert!(look_ahead.field_alias().is_none());
             assert_eq!(look_ahead.field_name(), "hero");
 
             assert!(look_ahead.has_arguments());
@@ -1436,8 +1462,8 @@ query Hero {
             let name_child = children.next().unwrap();
             assert!(look_ahead.has_child("name"));
             assert_eq!(name_child, look_ahead.select_child("name").unwrap());
-            assert_eq!(name_child.name, "name");
-            assert_eq!(name_child.alias, None);
+            assert_eq!(name_child.field_original_name(), "name");
+            assert_eq!(name_child.field_alias(), None);
             assert_eq!(name_child.field_name(), "name");
             assert!(!name_child.has_arguments());
             assert!(!name_child.has_children());
@@ -1448,17 +1474,17 @@ query Hero {
                 aliased_name_child,
                 look_ahead.select_child("aliasedName").unwrap()
             );
-            assert_eq!(aliased_name_child.name, "name");
-            assert_eq!(aliased_name_child.alias, Some("aliasedName"));
+            assert_eq!(aliased_name_child.field_original_name(), "name");
+            assert_eq!(aliased_name_child.field_alias(), Some("aliasedName"));
             assert_eq!(aliased_name_child.field_name(), "aliasedName");
             assert!(!aliased_name_child.has_arguments());
             assert!(!aliased_name_child.has_children());
 
             let friends_child = children.next().unwrap();
             assert!(look_ahead.has_child("friends"));
             assert_eq!(friends_child, look_ahead.select_child("friends").unwrap());
-            assert_eq!(friends_child.name, "friends");
-            assert_eq!(friends_child.alias, None);
+            assert_eq!(friends_child.field_original_name(), "friends");
+            assert_eq!(friends_child.field_alias(), None);
             assert_eq!(friends_child.field_name(), "friends");
             assert!(!friends_child.has_arguments());
             assert!(friends_child.has_children());
@@ -1470,8 +1496,8 @@ query Hero {
             let child = friends_children.next().unwrap();
             assert!(friends_child.has_child("name"));
             assert_eq!(child, friends_child.select_child("name").unwrap());
-            assert_eq!(child.name, "name");
-            assert_eq!(child.alias, None);
+            assert_eq!(child.field_original_name(), "name");
+            assert_eq!(child.field_alias(), None);
             assert_eq!(child.field_name(), "name");
             assert!(!child.has_arguments());
             assert!(!child.has_children());