From a669c9cfd90923ccd49045c3f8b2d3752ba6ba79 Mon Sep 17 00:00:00 2001
From: EliasSchriefer <elischriefer@gmail.com>
Date: Thu, 25 Nov 2021 16:05:26 +0100
Subject: [PATCH] Add `isUsernameUsed` to query methods Fixes #13 Have fun
 @David!

---
 src/graphql.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/graphql.rs b/src/graphql.rs
index 1e6468e..b75c99e 100644
--- a/src/graphql.rs
+++ b/src/graphql.rs
@@ -395,6 +395,17 @@ impl Query {
             .map_err(FieldError::from)
     }
 
+    async fn isUsernameUsed(context: &Context, username: String) -> FieldResult<bool> {
+        if !is_valid_user_name(&username) {
+            return Err(format!("{:?} is not a valid username", username).into());
+        }
+
+        Ok(sqlx::query(format!(
+            r#"SELECT user_name FROM users WHERE user_name="{}""#,
+            username,
+        ).as_str()).fetch_optional(&context.db).await?.is_some())
+    }
+
     async fn users(context: &Context) -> FieldResult<Vec<User>> {
         let rows = sqlx::query("SELECT * FROM users")
             .fetch_all(&context.db).await?;