reallife-gamemode/ReallifeGamemode.Database/Entities/Group.cs

using Microsoft.EntityFrameworkCore;
using ReallifeGamemode.Database;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using ReallifeGamemode.Database.Models;

namespace ReallifeGamemode.Database.Entities
{
  public class Group : IBankAccountOwner
  {
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    public string Name { get; set; }

    public IBankAccount GetBankAccount(DatabaseContext databaseContext = null)
    {
      GroupBankAccount bankAccount = null;
      if (databaseContext == null)
      {
        using (databaseContext = new DatabaseContext())
        {
          bankAccount = databaseContext.GroupBankAccounts.Include(g => g.Group).Where(g => g.Group == this).FirstOrDefault();
        }
      }
      else
      {
        bankAccount = databaseContext.GroupBankAccounts.Include(g => g.Group).Where(g => g.Group == this).FirstOrDefault();
      }

      if (bankAccount == null)
      {
        bankAccount = new GroupBankAccount
        {
          Group = this,
          Balance = 0
        };

        databaseContext.GroupBankAccounts.Add(bankAccount);
        databaseContext.SaveChanges();
      }

      return bankAccount;
    }
  }
}