1 files changed, 79 insertions, 0 deletions
diff --git a/src/Data/DevHive.Data/Repositories/RatingRepository.cs b/src/Data/DevHive.Data/Repositories/RatingRepository.cs
new file mode 100644
index 0000000..2048c3f
--- /dev/null
+++ b/src/Data/DevHive.Data/Repositories/RatingRepository.cs
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using DevHive.Data.Interfaces;
+using DevHive.Data.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace DevHive.Data.Repositories
+{
+	public class RatingRepository : BaseRepository<Rating>, IRatingRepository
+	{
+		private readonly DevHiveContext _context;
+
+		public RatingRepository(DevHiveContext context)
+			: base(context)
+		{
+			this._context = context;
+		}
+
+		public override async Task<Rating> GetByIdAsync(Guid id)
+		{
+			return await this._context.Rating
+				.Include(x => x.User)
+				.Include(x => x.Post)
+				.FirstOrDefaultAsync(x => x.Id == id);
+		}
+		/// <summary>
+		/// Gets all the ratings for a post.
+		/// </summary>
+		/// <param name="postId">Id of the post.</param>
+		/// <returns></returns>
+		public async Task<List<Rating>> GetRatingsByPostId(Guid postId)
+		{
+			return await this._context.Rating
+				.Include(x => x.User)
+				.Include(x => x.Post)
+				.Where(x => x.Post.Id == postId).ToListAsync();
+		}
+		/// <summary>
+		/// Checks if a user rated a given post. In DevHive every user has one or no rating for every post.
+		/// </summary>
+		/// <param name="userId">Id of the user.</param>
+		/// <param name="postId">Id of the post.</param>
+		/// <returns>True if the user has already rated the post and false if he hasn't.</returns>
+		public async Task<bool> UserRatedPost(Guid userId, Guid postId)
+		{
+			return await this._context.Rating
+				.Where(x => x.Post.Id == postId)
+				.AnyAsync(x => x.User.Id == userId);
+		}
+		/// <summary>
+		/// Gets a rating by the post to which the rating corresponds and the user who created it.
+		/// </summary>
+		/// <param name="userId">Id of the user.</param>
+		/// <param name="postId">Id of the post.</param>
+		/// <returns>Rating for the given post by the given user.</returns>
+		public async Task<Rating> GetRatingByUserAndPostId(Guid userId, Guid postId)
+		{
+			return await this._context.Rating
+				.Include(x => x.User)
+				.Include(x => x.Post)
+				.FirstOrDefaultAsync(x => x.Post.Id == postId && x.User.Id == userId);
+		}
+
+		/// <summary>
+		/// Checks if a given rating already exist
+		/// </summary>
+		/// <param name="id">Id of the rating</param>
+		/// <returns>True if the rating exists and false if it does not.</returns>
+		public async Task<bool> DoesRatingExist(Guid id)
+		{
+			return await this._context.Rating
+				.AsNoTracking()
+				.AnyAsync(r => r.Id == id);
+		}
+	}
+}
+