> For the complete documentation index, see [llms.txt](https://arif-hanif.gitbook.io/slackclone/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://arif-hanif.gitbook.io/slackclone/server/api/data-modeling/entities.md).

# PostgreSQL Entities

Create the following classes for the entities that will exist in the API based on the diagram above.

{% code title=".\Entities\User.cs" %}

```csharp
using System;

namespace SlackClone.Entities
{
    public class User
    {
        public Guid Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string FullName { get => $"{FirstName} {LastName}"; }
        public string Email { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public UserStatus Status { get; set; }
    }
}
```

{% endcode %}

{% code title=".\Entities\UserStatus.cs" %}

```csharp
using System;

namespace SlackClone.Entities
{
    public class UserStatus
    {
        public Guid Id { get; set; }
        public string Status { get; set; }
        public string Description { get; set; }
        public int Rank { get; set; }
    }
}
```

{% endcode %}

{% code title=".\Entities\DirectMessage.cs" %}

```csharp
using System;

namespace SlackClone.Entities
{
    public class DirectMessage
    {
        public Guid Id { get; set; }
        public string Content { get; set; }
        public User CreatedBy { get; set; }
        public User SentTo { get; set; }
        public DateTime CreatedAt { get; set; }
    }
}

```

{% endcode %}

{% code title=".\Entities\Channel.cs" %}

```csharp
using System;
using System.Collections.Generic;

namespace SlackClone.Entities
{
    public class Channel
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
        public ICollection<ChannelChannelMessage> 
            ChannelsChannelMessages { get; set; }
    }
}
```

{% endcode %}

{% code title=".\Entities\ChannelMessage.cs" %}

```csharp
using System;
using System.Collections.Generic;

namespace SlackClone.Entities
{
    public class ChannelMessage
    {
        public Guid Id { get; set; }
        public string Content { get; set; }
        public User CreatedBy { get; set; }
        public DateTime CreatedAt { get; set; }
        public int Likes { get; set; }
        public ICollection<ChannelChannelMessage> 
            ChannelsChannelMessages { get; set; }
    }
}
```

{% endcode %}

{% code title=".\Entities\ChannelChannelMessage.cs" %}

```csharp
using System;

namespace SlackClone.Entities
{
    public class ChannelChannelMessage
    {
        public Guid ChannelId { get; set; }
        public Channel Channel { get; set; }
        public Guid MessageId { get; set; }
        public ChannelMessage ChannelMessage { get; set; }
    }
}
```

{% endcode %}