4 files changed, 7 insertions, 7 deletions
diff --git a/src/DevHive.Data/Models/Language.cs b/src/DevHive.Data/Models/Language.cs
index 0db8cb6..f2b2786 100644
--- a/src/DevHive.Data/Models/Language.cs
+++ b/src/DevHive.Data/Models/Language.cs
@@ -8,6 +8,6 @@ namespace DevHive.Data.Models
 	{
 		public Guid Id { get; set; }
 		public string Name { get; set; }
-		public List<User> Users { get; set; }
+		public HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Models/Role.cs b/src/DevHive.Data/Models/Role.cs
index e63f007..e0855aa 100644
--- a/src/DevHive.Data/Models/Role.cs
+++ b/src/DevHive.Data/Models/Role.cs
@@ -12,6 +12,6 @@ namespace DevHive.Data.Models
 		public const string DefaultRole = "User";
 		public const string AdminRole = "Admin";
 
-		public List<User> Users { get; set; }
+		public HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Models/Technology.cs b/src/DevHive.Data/Models/Technology.cs
index 9096cbe..a0728d5 100644
--- a/src/DevHive.Data/Models/Technology.cs
+++ b/src/DevHive.Data/Models/Technology.cs
@@ -8,6 +8,6 @@ namespace DevHive.Data.Models
 	{
 		public Guid Id { get; set; }
 		public string Name { get; set; }
-		public List<User> Users { get; set; }
+		public HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Models/User.cs b/src/DevHive.Data/Models/User.cs
index cf779f5..2ac7adf 100644
--- a/src/DevHive.Data/Models/User.cs
+++ b/src/DevHive.Data/Models/User.cs
@@ -19,15 +19,15 @@ namespace DevHive.Data.Models
 		/// Languages that the user uses or is familiar with
 		/// </summary>
 		// [Unique]
-		public IList<Language> Languages { get; set; }
+		public HashSet<Language> Languages { get; set; }
 
 		/// <summary>
 		/// Technologies that the user uses or is familiar with
 		/// </summary>
-		public IList<Technology> Technologies { get; set; } = new List<Technology>();
+		public HashSet<Technology> Technologies { get; set; } = new HashSet<Technology>();
 
-		public IList<Role> Roles { get; set; } = new List<Role>();
+		public HashSet<Role> Roles { get; set; } = new HashSet<Role>();
 
-		public IList<User> Friends { get; set; } = new List<User>();
+		public HashSet<User> Friends { get; set; } = new HashSet<User>();
 	}
 }