From f51e0d671880b32a574060c642e405c590dd0974 Mon Sep 17 00:00:00 2001
From: Lucas Pickering
Date: Wed, 20 May 2020 07:48:37 -0400
Subject: Add a blanket Validate implementation for references

---
 validator/src/traits.rs         |  6 ++++++
 validator_derive/tests/range.rs | 21 ++++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/validator/src/traits.rs b/validator/src/traits.rs
index 61bb002..93b23fa 100644
--- a/validator/src/traits.rs
+++ b/validator/src/traits.rs
@@ -93,3 +93,9 @@ impl<'a, S, H: ::std::hash::BuildHasher> Contains for &'a HashMap<String, S, H>
 pub trait Validate {
     fn validate(&self) -> Result<(), ValidationErrors>;
 }
+
+impl<T: Validate> Validate for &T {
+    fn validate(&self) -> Result<(), ValidationErrors> {
+        T::validate(*self)
+    }
+}
diff --git a/validator_derive/tests/range.rs b/validator_derive/tests/range.rs
index 869510a..006d085 100644
--- a/validator_derive/tests/range.rs
+++ b/validator_derive/tests/range.rs
@@ -2,7 +2,7 @@
 extern crate validator_derive;
 extern crate validator;
 
-use validator::Validate;
+use validator::{Validate, ValidationErrors};
 
 #[test]
 fn can_validate_range_ok() {
@@ -71,3 +71,22 @@ fn can_specify_message_for_range() {
     assert_eq!(errs["val"].len(), 1);
     assert_eq!(errs["val"][0].clone().message.unwrap(), "oops");
 }
+
+#[test]
+fn can_pass_reference_as_validate() {
+    // This tests that the blanket Validate implementation on
+    // `&T where T:Validate` works properly
+
+    #[derive(Validate)]
+    struct TestStruct {
+        #[validate(range(min = 100))]
+        num_field: u32,
+    }
+
+    fn validate<T: Validate>(value: T) -> Result<(), ValidationErrors> {
+        value.validate()
+    }
+
+    let val = TestStruct { num_field: 10 };
+    validate(&val).unwrap_err();
+}
-- 
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