From 080330966333fe61b6a9d5413c6b05b9ea77f4dc Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 26 Nov 2020 20:02:03 +0800
Subject: feat: Add highlight timeline entity and service.

---
 BackEnd/Timeline/Services/UserService.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'BackEnd/Timeline/Services/UserService.cs')

diff --git a/BackEnd/Timeline/Services/UserService.cs b/BackEnd/Timeline/Services/UserService.cs
index 2c5644cd..76c24666 100644
--- a/BackEnd/Timeline/Services/UserService.cs
+++ b/BackEnd/Timeline/Services/UserService.cs
@@ -38,6 +38,13 @@ namespace Timeline.Services
         /// <exception cref="BadPasswordException">Thrown when password is wrong.</exception>
         Task<User> VerifyCredential(string username, string password);
 
+        /// <summary>
+        /// Check if a user exists.
+        /// </summary>
+        /// <param name="id">The id of the user.</param>
+        /// <returns>True if exists. Otherwise false.</returns>
+        Task<bool> CheckUserExistence(long id);
+
         /// <summary>
         /// Try to get a user by id.
         /// </summary>
@@ -188,6 +195,11 @@ namespace Timeline.Services
             return await CreateUserFromEntity(entity);
         }
 
+        public async Task<bool> CheckUserExistence(long id)
+        {
+            return await _databaseContext.Users.AnyAsync(u => u.Id == id);
+        }
+
         public async Task<User> GetUser(long id)
         {
             var user = await _databaseContext.Users.Where(u => u.Id == id).SingleOrDefaultAsync();
-- 
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