DepartmentRepository.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using ScientificReport.DAL.DbContext;
using ScientificReport.DAL.Entities;
using ScientificReport.DAL.Interfaces;

namespace ScientificReport.DAL.Repositories
{
    public class DepartmentRepository : IRepository<Department>
    {
        private readonly ScientificReportDbContext _context;
        
        public DepartmentRepository(ScientificReportDbContext context)
        {
            _context = context;
        }
        
        public virtual IEnumerable<Department> All()
        {
            return _context.Departments
                    .Include(b => b.ScientificWorks)
                    .Include(u => u.Staff)
                    .Include(h => h.Head)
                ;
        }

        public virtual IEnumerable<Department> AllWhere(Func<Department, bool> predicate)
        {
            return All().Where(predicate);
        }

        public virtual Department Get(Guid id)
        {
            return All().FirstOrDefault(u => u.Id == id);
        }

        public virtual Department Get(Func<Department, bool> predicate)
        {
            return All().Where(predicate).FirstOrDefault();
        }

        public virtual void Create(Department item)
        {
            _context.Departments.Add(item);
            _context.SaveChanges();
        }

        public virtual void Update(Department item)
        {
            if (item != null)
            {
                _context.Departments.Update(item);
                _context.SaveChanges();
            }
        }

        public virtual void Delete(Guid id)
        {
            var item = _context.Departments.Find(id);
            if (item != null)
            {
                _context.Departments.Remove(item);
                _context.SaveChanges();
            }
        }

        public virtual IQueryable<Department> GetQuery()
        {
            return _context.Departments;
        }
    }
}