10 files changed, 18 insertions, 18 deletions
diff --git a/src/DevHive.Data/Interfaces/Models/ILanguage.cs b/src/DevHive.Data/Interfaces/Models/ILanguage.cs
index 9549777..b77d5ae 100644
--- a/src/DevHive.Data/Interfaces/Models/ILanguage.cs
+++ b/src/DevHive.Data/Interfaces/Models/ILanguage.cs
@@ -6,7 +6,7 @@ namespace DevHive.Data.Interfaces.Models
 	public interface ILanguage : IModel
 	{
 		string Name { get; set; }
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/IRole.cs b/src/DevHive.Data/Interfaces/Models/IRole.cs
index 0623f07..c8b7068 100644
--- a/src/DevHive.Data/Interfaces/Models/IRole.cs
+++ b/src/DevHive.Data/Interfaces/Models/IRole.cs
@@ -5,6 +5,6 @@ namespace DevHive.Data.Interfaces.Models
 {
 	public interface IRole
 	{
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/ITechnology.cs b/src/DevHive.Data/Interfaces/Models/ITechnology.cs
index 159a21a..153f75f 100644
--- a/src/DevHive.Data/Interfaces/Models/ITechnology.cs
+++ b/src/DevHive.Data/Interfaces/Models/ITechnology.cs
@@ -6,6 +6,6 @@ namespace DevHive.Data.Interfaces.Models
 	public interface ITechnology : IModel
 	{
 		string Name { get; set; }
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/IUser.cs b/src/DevHive.Data/Interfaces/Models/IUser.cs
index ef8c927..08ce385 100644
--- a/src/DevHive.Data/Interfaces/Models/IUser.cs
+++ b/src/DevHive.Data/Interfaces/Models/IUser.cs
@@ -8,9 +8,9 @@ namespace DevHive.Data.Interfaces.Models
 		string FirstName { get; set; }
 		string LastName { get; set; }
 		string ProfilePictureUrl { get; set; }
-		IList<Language> Languages { get; set; }
-		IList<Technology> Technologies { get; set; }
-		IList<Role> Roles { get; set; }
-		IList<User> Friends { get; set; }
+		HashSet<Language> Languages { get; set; }
+		HashSet<Technology> Technologies { get; set; }
+		HashSet<Role> Roles { get; set; }
+		HashSet<User> Friends { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Repositories/IUserRepository.cs b/src/DevHive.Data/Interfaces/Repositories/IUserRepository.cs
index eca6adb..456eb94 100644
--- a/src/DevHive.Data/Interfaces/Repositories/IUserRepository.cs
+++ b/src/DevHive.Data/Interfaces/Repositories/IUserRepository.cs
@@ -14,8 +14,8 @@ namespace DevHive.Data.Interfaces.Repositories
 
 		Task<User> GetByUsernameAsync(string username);
 		Language GetUserLanguage(User user, Language language);
-		IList<Language> GetUserLanguages(User user);
-		IList<Technology> GetUserTechnologies(User user);
+		HashSet<Language> GetUserLanguages(User user);
+		HashSet<Technology> GetUserTechnologies(User user);
 		Technology GetUserTechnology(User user, Technology technology);
 		IEnumerable<User> QueryAll();
 
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>();
 	}
 }
diff --git a/src/DevHive.Data/Repositories/UserRepository.cs b/src/DevHive.Data/Repositories/UserRepository.cs
index 2ca8099..492d46b 100644
--- a/src/DevHive.Data/Repositories/UserRepository.cs
+++ b/src/DevHive.Data/Repositories/UserRepository.cs
@@ -82,7 +82,7 @@ namespace DevHive.Data.Repositories
 				.FirstOrDefaultAsync(x => x.UserName == username);
 		}
 
-		public IList<Language> GetUserLanguages(User user)
+		public HashSet<Language> GetUserLanguages(User user)
 		{
 			return user.Languages;
 		}
@@ -93,7 +93,7 @@ namespace DevHive.Data.Repositories
 				.FirstOrDefault(x => x.Id == language.Id);
 		}
 
-		public IList<Technology> GetUserTechnologies(User user)
+		public HashSet<Technology> GetUserTechnologies(User user)
 		{
 			return user.Technologies;
 		}