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Admin
2026-09-24 13:24:43 +02:00
parent 16478678b5
commit 73e37dbecd
401 changed files with 14735 additions and 12995 deletions
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backend/Core/Musify.Application/Users/FollowUser.cs
+37 -36
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@@ -6,46 +6,47 @@ using Musify.Application.Contracts;
using Musify.Application.Shared;
using Musify.Domain.Entities;
namespace Musify.Application.Users;
public record FollowUserCommand(long FollowerId, long FollowedId) : ICommand<ErrorOr<Success>>;
public class FollowUserCommandHandler(
IDatabase database,
ILogger<FollowUserCommandHandler> logger)
: ICommandHandler<FollowUserCommand, ErrorOr<Success>>
namespace Musify.Application.Users
{
public async ValueTask<ErrorOr<Success>> Handle(FollowUserCommand request, CancellationToken cancellationToken)
public record FollowUserCommand(long FollowerId, long FollowedId) : ICommand<ErrorOr<Success>>;
public class FollowUserCommandHandler(
IDatabase database,
ILogger<FollowUserCommandHandler> logger)
: ICommandHandler<FollowUserCommand, ErrorOr<Success>>
{
if (request.FollowerId == request.FollowedId)
return Error.Validation(description: "A user cannot follow themselves.");
var followedExists = await database.Users
.AsNoTracking()
.AnyAsync(u => u.Id == request.FollowedId, cancellationToken);
if (!followedExists)
return AppErrors.NotFound("User", request.FollowedId);
var alreadyFollowing = await database.UserFollows
.AsNoTracking()
.AnyAsync(f => f.FollowerId == request.FollowerId && f.FollowedId == request.FollowedId, cancellationToken);
if (alreadyFollowing)
return Result.Success;
await database.UserFollows.AddAsync(new UserFollow
public async ValueTask<ErrorOr<Success>> Handle(FollowUserCommand request, CancellationToken cancellationToken)
{
FollowerId = request.FollowerId,
FollowedId = request.FollowedId
}, cancellationToken);
if (request.FollowerId == request.FollowedId)
return Error.Validation(description: "A user cannot follow themselves.");
var followedExists = await database.Users
.AsNoTracking()
.AnyAsync(u => u.Id == request.FollowedId, cancellationToken);
if (!followedExists)
return AppErrors.NotFound("User", request.FollowedId);
var alreadyFollowing = await database.UserFollows
.AsNoTracking()
.AnyAsync(f => f.FollowerId == request.FollowerId && f.FollowedId == request.FollowedId, cancellationToken);
if (alreadyFollowing)
return Result.Success;
await database.UserFollows.AddAsync(new UserFollow
{
FollowerId = request.FollowerId,
FollowedId = request.FollowedId
}, cancellationToken);
// A concurrent double click can hit the unique index; already following is a successful no-op.
var saved = await database.TrySaveChangesAsync(
AppErrors.Conflict("UserFollow.Duplicate", "Already following this user."), cancellationToken);
if (saved.IsError)
return Result.Success;
logger.LogInformation("User {FollowerId} followed user {FollowedId}", request.FollowerId, request.FollowedId);
// A concurrent double click can hit the unique index; already following is a successful no-op.
var saved = await database.TrySaveChangesAsync(
AppErrors.Conflict("UserFollow.Duplicate", "Already following this user."), cancellationToken);
if (saved.IsError)
return Result.Success;
logger.LogInformation("User {FollowerId} followed user {FollowedId}", request.FollowerId, request.FollowedId);
return Result.Success;
}
}
}