Below is my Hierarchical model
public class MenuModel
{
public int Id { get; set; }
public string Name { get; set; } = null!;
public string? Url { get; set; } = null!;
public string? Icon { get; set; }
public int? ParentId { get; set; }
public MenuModel Parent { get; set; } = null!;
public ICollection<MenuModel>? Children { get; set; } = new List<MenuModel>();
}
Query:
return await _context.Menus//.Include(o => o.Parent)
.Include(m => m.Childrens)
.ThenInclude(m => m.Childrens)
.Where(m => m.ParentId == null)
.ToListAsync();
Query is working fine: How to exclude menu without child elements
Please check below..
I have Added in configuration
services.AddControllers()
.AddNewtonsoftJson(options =>
{
options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
})
.AddJsonOptions(options => {
options.JsonSerializerOptions.IgnoreNullValues = true;
});
But in json file it coming.. Is it possible to exclude in ef core itself? I am using latest EF core preview.
EDIT:
Ef itself count with 0 showing ..How avoid with count=0?
You're assigning a default value to the Children property, which is why you always see it in your response. To fix this, simply change the = new List<MenuModel>(); to = null!;
public class MenuModel
{
...
public ICollection<MenuModel>? Children { get; set; } = null!;
}
Related
This is my DTO
public class Part1
{
public Part1()
{
Value = new List<ValueList>();
}
public int Id{ get; set; }
public List<ValueList> Value { get; set; }
}
public class ValueList
{
public int Value1 { get; set; }
public string Value2 { get; set; }
public string Value3 { get; set; }
}
and this is my table structure and I want to save above dto into below dto using automapper
public class Part1
{
public int Id{ get; set; }
public int Value1 { get; set; }
public string Value2 { get; set; }
public string Value3 { get; set; }
}
Do you want to know how to make the list map to singel string in the new model?
You can check my demo, in mapper profile, define the three values to map:
public class AutoMapping : Profile
{
public AutoMapping()
{
CreateMap<Part1, Part1DTO>() //Part1DTO is your below model
.ForMember(x => x.Value1, m => m.MapFrom(src => src.Value[0].Value1))
.ForMember(x => x.Value2, m => m.MapFrom(src => src.Value[0].Value2))
.ForMember(x => x.Value3, m => m.MapFrom(src => src.Value[0].Value3));
}
}
Controller:
public IActionResult Index()
{
Part1 part1= new Part1()
{
Id=1,
Value=new List<ValueList> { new ValueList { Value1=1,Value2="b",Value3="c"} }
}; //define old model
var result = _mapper.Map<Part1DTO>(part1); // map to new
return View(result);
}
Don't forget to add this in ConfigureServices:
services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
Result:
I'm struggling with net core returning truncated response. I have already defined no reference loop in my startup services, and also tried to set compatibility version for the version i'm currently using 2.1 as follows:
services.AddMvc()
.SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
.AddJsonOptions(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);
I also tried to serialize the array using JsonConvert and it did not throw any reference loop exception. Here's the action in the controller and the serializedArray text:
public IActionResult GetProductItems(int productId)
{
try
{
var productItems = _productsMethods.GetProductItems(productId);
// for testing the object for ref loops
string serialized = Newtonsoft.Json.JsonConvert.SerializeObject(productItems);
return Ok(productItems);
}
catch (ClientException ex)
{
return BadRequest(new { message = ex.Message });
}
catch (Exception ex)
{
return StatusCode(500, new { message = ex.Message });
}
}
// serialized string
//[{"ID":2,"ProductId":6,"ItemId":4,"Product":null,"Item":null,"Orders":[]},{"ID":3,"ProductId":":6,"ItemId":1,"Product":null,"Item":null,"Orders":[]},{"ID":5,"ProductId":":6,"ItemId":2,"Product":null,"Item":null,"Orders":[]}]
Here's the actual response
[{"id":2,"productId":6,"itemId":4,"product":null,"item":null,"orders":
Method:
public List<ProductItem> GetProductItems(int productId)
{
IQueryable<DataSets.ProductItem> query = db.ProductItems
.AsNoTracking()
.Include(k => k.Orders)
.Where(k => k.ProductId == productId);
// result truncated (when array orders is empty)
//return query.Select(_mapper.Map<ProductItem>).ToList();
// without automapper, also truncated
//return query.Select(k => new ProductItem()
//{
// ID = k.ID,
// ItemId = k.ItemId,
// ProductId = k.ProductId,
// Orders = k.Orders.Select(a => new Order() { ID = a.ID })
// .ToList()
//}).ToList();
// WORKS, not getting truncated
// order not included
return query.Select(k => new ProductItem()
{
ID = k.ID,
ItemId = k.ItemId,
ProductId = k.ProductId,
}).ToList();
}
Entities (renamed and removed props for simplification):
public class Product
{
public int ID { get; set; }
// some props
public string UserId { get; set; }
public User User { get; set; }
public List<ProductItem> Items { get; set; }
}
public class ProductItem
{
public int ID { get; set; }
// some props
public int ProductId { get; set; }
public int ItemId { get; set; }
public Product Product { get; set; }
public Item Item { get; set; }
public List<Order> Orders { get; set; }
}
public class Order
{
public int ID { get; set; }
// some props
public int ItemId { get; set; }
public ProductItemOrder Item { get; set; }
}
Since there is no reference loop in orders and also the reference loop is ignored. Why is this still truncating?
I think the problem is public Product Product { get; set; } part here. You should define your Product entity virtually.
Here is an example below,
public class Blog
{
public int BlogId { get; set; }
public string Name { get; set; }
public string Url { get; set; }
public string Tags { get; set; }
public virtual ICollection<Post> Posts { get; set; }
}
Here is source.
For someone who might have this issue in the future. While I think the API should throw that error instead of just truncating the response.
I had 2 properties with the same letters but different letter case IPAddress and IpAddress.
SerializeObject alone wasn't throwing an exception, then I did this (CamelCase Resolver) to point out the issue:
Newtonsoft.Json.JsonConvert.DefaultSettings = () => new Newtonsoft.Json.JsonSerializerSettings
{
NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore,
ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver()
};
string serialized = Newtonsoft.Json.JsonConvert.SerializeObject(productItems);
So it threw: A member with the name 'ipAddress' already exists on ...
My mode class:
public class AccountCustomer
{
public bool IsMain { get; set; }
public int AccountId { get; set; }
public Account Account { get; set; }
public int CustomerId { get; set; }
public Customer Customer { get; set; }
}
public class Account
{
public int Id { get; set; }
public strig No{ get; set; }
..other fields
public ICollection<AccountCustomer> AccCustomer { get; set; } = new List<AccountCustomer>();
}
public class Customer
{
public int Id { get; set; }
public strig Name{ get; set; }
..other fields
public ICollection<AccountCustomer> AccCustomer { get; set; } = new List<AccountCustomer>();
}
I found soluton here and i have implemented same later i found that it is for without extra column
Many to many ef core updaate
Please let meknow how to do update... Am using latest ef 5 preview
My code :
_context.Set<AccountCustomer>().UpdateLinks(ac => ac.AccountId, account.Id,
ac => ac.CustomerId, account.AccCustomer .Select(ac => ac.CustomerId));
Codes of ManyToMany Update Extensions
Remove the unselected item and add new item to list.
public static class Extensions
{
public static void TryUpdateManyToMany<T, TKey>(this DbContext db, IEnumerable<T> currentItems, IEnumerable<T> newItems, Func<T, TKey> getKey) where T : class
{
db.Set<T>().RemoveRange(currentItems.ExceptThat(newItems, getKey));
db.Set<T>().AddRange(newItems.ExceptThat(currentItems, getKey));
}
private static IEnumerable<T> ExceptThat<T, TKey>(this IEnumerable<T> items, IEnumerable<T> other, Func<T, TKey> getKeyFunc)
{
return items
.GroupJoin(other, getKeyFunc, getKeyFunc, (item, tempItems) => new { item, tempItems })
.SelectMany(t => t.tempItems.DefaultIfEmpty(), (t, temp) => new { t, temp })
.Where(t => ReferenceEquals(null, t.temp) || t.temp.Equals(default(T)))
.Select(t => t.t.item);
}
}
Codes of Update ViewModel
The update view pass it to action via request.
public class AccountCustomerVM
{
public bool IsMain { get; set; }
public Account Account { get; set; }
public List<int> Customers { get; set; }
}
Codes of Update Action
[HttpPut]
public IActionResult Update(AccountCustomerVM accountCustomerVM)
{
var model = _context.Accounts.Include(x => x.AccCustomer).FirstOrDefault(x => x.Id == accountCustomerVM.Account.Id);
_context.TryUpdateManyToMany(model.AccCustomer, accountCustomerVM.Customers
.Select(x => new AccountCustomer
{
IsMain = accountCustomerVM.IsMain,
CustomerId = x,
AccountId = accountCustomerVM.Account.Id
}), x => x.CustomerId);
_context.SaveChanges();
return Ok();
}
Hello I have problem in one query. Why it's always return no value.
public List<UserDetail> userSearchModel(UserSearchModel searchModel)
{
string userid = User.Identity.GetUserId();
var user = _dbContext.UserDetails.Where(x => x.Id == userid);
var result = _dbContext.UserDetails.Except(user).ToList().AsQueryable();
if (searchModel != null)
{
if (searchModel.LanguageId.Count() != 0)
{
List<UserDetailLanguage> usrDetails = new List<UserDetailLanguage>();
foreach (var item in searchModel.LanguageId)
{
var details = _dbContext.UserDetailLanguages.Where(x => x.LanguageId == item).ToList();
foreach (var item2 in details)
{
usrDetails.Add(item2);
}
}
result = result.Where(x => x.UserDetailLanguages == usrDetails);
}
}
return result.ToList();
}
I want to get results which are the same in usrDetails list and in result.UserDetailLanguages.
In result.UserDetailLanguages I have record equals to record in usrDetails but this not want retrieve.
Here is my model:
public class UserDetail
{
public UserDetail()
{
this.UserDetailLanguages = new HashSet<UserDetailLanguage>();
}
[Key, ForeignKey("User")]
public string Id { get; set; }
public DateTime Birthday { get; set; }
public string Sex { get; set; }
public string Country { get; set; }
public string About { get; set; }
[NotMapped]
public int Age { get { return DateTime.Now.Year - Birthday.Year; } }
public virtual ApplicationUser User { get; set; }
public virtual ICollection<UserDetailLanguage> UserDetailLanguages { get; set; }
}
public class UserDetailLanguage
{
public Int32 Id { get; set; }
public virtual UserDetail UserDetail { get; set; }
public string UserDetailId { get; set; }
public virtual Language Language { get; set; }
public Int32 LanguageId { get; set; }
public Boolean IsKnown { get; set; }
public static implicit operator List<object>(UserDetailLanguage v)
{
throw new NotImplementedException();
}
}
public class Language
{
public Language()
{
this.UserDetailLanguages = new HashSet<UserDetailLanguage>();
}
public int Id { get; set; }
public string Value { get; set; }
public string Name { get; set; }
public virtual ICollection<UserDetailLanguage> UserDetailLanguages { get; set; }
}
What I'm doing wrong?
If you want to see if your value is in a list you use the Contains function of the list -- like this:
result = result.Where(x => usrDetails.Contains(x.UserDetailLanguage));
If you want to see if there are any items in both lists you can use intersection like this:
result = result.Where(x => usrDetails.Intersect(x.UserDetailLanguage).Count() > 0);
Looks like you are checking equality between lists in following code
result = result.Where(x => x.UserDetailLanguages == usrDetails);
This might not work, to check equality for lists you can use something like
Enumerable.SequenceEqual(FirstList.OrderBy(fList => fList),
SecondList.OrderBy(sList => sList))
The ManagingAgent child property on the Complex entity is not being loaded with data.... possibly the result of too much mulled wine.
I have logged the SQL on the database calls and the SQL is returning the correct data.
LazyLoading is disabled.
public ApplicationDbContext()
: base("DefaultConnection")
{
this.Configuration.LazyLoadingEnabled = false;
}
Aggregate Root
public class Complex
{
public Complex()
{
Forums = new List<Forum>();
ManagingAgent = new ManagingAgent();
}
[Key]
public int ComplexId { get; set; }
[Required]
public string Name { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
public string Address3 { get; set; }
public int? PostCodeId { get; set; }
public PostCode PostCode { get; set; }
public int? LocationId { get; set; }
public Location Location { get; set; }
public int? CountyId { get; set; }
public County County { get; set; }
public int? ManagingAgentId { get; set; }
public ManagingAgent ManagingAgent { get; set; }
public int? CountOfUnits { get; set; }
public List<Forum> Forums { get; set; }
}
Attempt 1. using Include...
public List<Complex> GetComplexesByUserId(Guid userId)
{
using (var db = new ApplicationDbContext())
{
db.Database.Log = Logger;
var complexIds = db.UserApartments.Where(r => r.UserId == userId)
.Select(c => c.ComplexId).ToList();
return db.Complexes.Where(c => complexIds.Contains(c.ComplexId))
.Include(m => m.ManagingAgent).ToList();
}
}
Attempt 2 - explicitly loading ..same result (SQL returns data correctly but ManagingAgent isn't populated)
public List<Complex> GetComplexesByUserId(Guid userId)
{
using (var db = new ApplicationDbContext())
{
db.Database.Log = Logger;
var complexIds = db.UserApartments.Where(r => r.UserId == userId)
.Select(c => c.ComplexId).ToList();
var list = new List<Complex>();
foreach (var id in complexIds)
{
var complex = db.Complexes.Find(id);
db.Entry(complex).Reference(m => m.ManagingAgent).Load();
list.Add(complex);
}
return list;
}
}
So, to force the load I am doing this.... not good..
foreach (var id in complexIds)
{
var complex = db.Complexes.Find(id);
var managingAgent = db.ManagingAgents.Find(complex.ManagingAgentId);
complex.ManagingAgent = managingAgent;
list.Add(complex);
}
Remove this line...
ManagingAgent = new ManagingAgent();
...from the constructor of the Complex entity. Then it will work. (Generally don't instantiate reference navigation properties in an entity default constructor. EF calls this constructor via reflection when it materializes the entity and "gets confused" if the navigation property already has a reference. I can't explain the "gets confused" better since I don't know the exact mechanism of object materialization with related entities, but the effect is that the loaded child column values are ignored because there is already an instantiated child entity, but just with the useless default values from the ManagingAgent constructor.)