I am using .NET 3.1.21 and I'm getting the error:
'CollectionNavigationBuilder<ApplicationUser, ClassroomGroup>' does not contain a definition for 'WithMany' and no accessible extension method 'WithMany' accepting a first argument of type 'CollectionNavigationBuilder<ApplicationUser, ClassroomGroup>' could be found (are you missing a using directive or an assembly reference?)
The syntax seems to be okay from what I've seen so far.
ApplicationDbContext
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
foreach (var relationship in builder.Model.GetEntityTypes().SelectMany(e => e.GetForeignKeys()))
relationship.DeleteBehavior = DeleteBehavior.Restrict;
builder.Entity<ApplicationUser>().HasMany(x => x.TeacherGroups).WithOne(x => x.Teacher).OnDelete(DeleteBehavior.SetNull);
builder.Entity<ApplicationUser>().HasMany(x => x.StudentGroups).WithMany(x => x.Students); //this .WithMany gives me the error
builder.Entity<ApplicationUser>().HasMany(x => x.UserRoles).WithOne(x => x.User)
.HasForeignKey(x => x.UserId).IsRequired().OnDelete(DeleteBehavior.Cascade);
}
ApplicationUser
public class ApplicationUser : IdentityUser
{
public virtual ICollection<ApplicationUserRole> UserRoles { get; set; }
public virtual ICollection<ClassroomGroup> TeacherGroups { get; set; }
public virtual ICollection<ClassroomGroup> StudentGroups { get; set; }
public virtual ICollection<Task> CreatedTasks { get; set; }
public virtual ICollection<SchoolClassStudentTerm> SchoolClassStudentTerms { get; set; }
public virtual ICollection<GroupAssignment> CreatedGroupAssignments { get; set; }
public bool Disabled { get; set; }
public String FullName { get; set; }
public DateTime? StartTime { get; set; }
}
ClassroomGroup
public class ClassroomGroup
{
public int SubjectId { get; set; }
public virtual Subject Subject { get; set; }
public virtual SchoolClass SchoolClass { get; set; }
public int SchoolClassId { get; set; }
public String TeacherId { get; set; }
public virtual ApplicationUser Teacher { get; set; }
public int Id { get; set; }
public String Title { get; set; }
public virtual ICollection<ApplicationUser> Students { get; set; }
public int TermId { get; set; }
public virtual Term Term { get; set; }
public virtual ICollection<GroupAssignment> GroupAssignments { get; set; }
}
All packages are up to date
Related
I work on an API and when I want to get data from a many-to-many relationship, I get back null.
The connection with the database is OK, and Post date work.
But when I get info from the database, the table for the many-to-many relationship is empty
public class User
{
[Key]
public int Id { get; set; }
[Required]
[MaxLength(30)]
public string Pseudo { get; set; }
[EmailAddress]
public string Mail { get; set; }
[Required]
public string Pwd { get; set; }
[Required]
public bool IsAdmin { get; set; }
public ICollection<Project> UsersProjectstry { get; set; }
public ICollection<UserProjectMTM> UsersProjects { get; set; }
}
public class Project
{
[Key]
public int Id { get; set; }
[Required]
[MaxLength(30)]
public string Name { get; set; }
[Required]
[MinLength(100)]
public string Description { get; set; }
public string? img { get; set; }
[Required]
public DateTime StartDate { get; set; }
[Required]
public DateTime EndDate { get; set; }
[Required]
public int SumGoal { get; set; }
public int Sum { get; set; }
[Required]
public User ProjectManager { get; set; }
public ICollection<UserProjectMTM> Donator { get; set; }
}
public class UserProjectMTM
{
public int PId { get; set; }
public Project Project { get; set; }
public int UId { get; set; }
public User User { get; set; }
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.ApplyConfiguration(new ProjectConfig());
modelBuilder.ApplyConfiguration(new UserConfig());
modelBuilder.ApplyConfiguration(new CommentConfig());
modelBuilder.Entity<UserProjectMTM>().HasKey(x => new { x.UId, x.PId });
modelBuilder.Entity<UserProjectMTM>().HasOne(p=> p.Project).WithMany(u=> u.Donator).HasForeignKey(x=>x.PId);
modelBuilder.Entity<UserProjectMTM>().HasOne(u => u.User).WithMany(p=> p.UsersProjects).HasForeignKey(x => x.UId);
}
public IEnumerable<TEntity> GetAll()
{
return _Context.Set<TEntity>();
}
public TEntity? GetById(params object[] Id)
{
return _Context.Set<TEntity>().Find(Id);
}
I try a lot of things - so far without success.
I'm junior and I can't find the solution - please help.
I was making an API for saving a model where it has one to many relationship with another model. When I applying automapping in it. it is giving me following error:
CreateContestDto -> Contest
tritronAPI.DTOs.CreateContestDto -> tritronAPI.Model.Contest
Type Map configuration:
CreateContestDto -> Contest
tritronAPI.DTOs.CreateContestDto -> tritronAPI.Model.Contest
Destination Member:
Problems
---> AutoMapper.AutoMapperMappingException: Missing type map
configuration or unsupported mapping.
Mapping types:
ProblemDto -> Problem
tritronAPI.DTOs.ProblemDto -> tritronAPI.Model.Problem
at lambda_method(Closure , ProblemDto , Problem , ResolutionContext )
My models are: Contest and Problem a contest contain many problems:
public class Contest
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public string Name { get; set; }
public DateTime StartTime { get; set; }
public DateTime EndTime { get; set; }
public ICollection<Problem> Problems { get; set; }
public ICollection<ContestProgrammingLanguage>
ContestProgrammingLanguages { get; set; }
}
public class Problem
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
[MaxLength(255)]
public string ProblemName { get; set; }
[ForeignKey("User")]
public string ProblemAuthorId { get; set; }
public virtual User ProblemAuthor { get; set; }
public string AuthorName { get; set; }
//public virtual List<Resources> Resourceses { get; set; }
public string ProblemDescription { get; set; }
public bool IsPublished { get; set; }
public virtual ICollection<Submission> Submissions { get; set; }
public string Tags { get; set; }
//public Guid Contest_Id { get; set; }
public virtual Contest Contest { get; set; }
[ForeignKey("Contest")]
public int? Contest_Id { get; set; }
public short Score { get; set; }
//Timelimit in miliseconds
public int TimeLimit { get; set; }
//MemoryLimit in bytes
public int MemoryLimit { get; set; }
//More than source code limit is not allowed
public int? SourceCodeLimit { get; set; }
public virtual ICollection<TestFile> TestFiles { get; set; } = new
List<TestFile>();
}
public class CreateContestDto
{
public CreateContestDto()
{
this.Problems = new HashSet<ProblemDto>();
}
public string Name { get; set; }
public DateTime StartDate { get; set; }
public DateTime StartTime { get; set; }
public DateTime EndDate { get; set; }
public DateTime EndTime { get; set; }
public string BackgroundImage { get; set; }
public string Description { get; set; }
public ICollection<ProblemDto> Problems { get; set; }
}
public class ProblemDto
{
public int Id { get; set; }
public string ProblemName { get; set; }
}
mapping profile:
CreateMap<CreateContestDto, Contest>().ForMember(
dest => dest.Problems , opt => opt.MapFrom(src =>
src.Problems));
controller code:
public async Task<IActionResult> AddContest([FromBody]
CreateContestDto contest)
{
var con = _mapper.Map<Contest>(contest);
this._uow.ContestRepository.Add(con);
return Ok();
}
I have already tried with reversemap selecting new id in mapping profile
You also need to add mappings for ProblemDTO to Problem:
CreateMap<CreateContestDto, Contest>();
CreateMap<ProblemDto, Problem>();
I need help with auto mapping in Fluent Nhibernate. Here's the tables I want to have in my app (they are many of them, but I want to start from mapping only a few of them)
Well, I'd like to use the AutoMapping functionality because I don't want to write the mapping classes for more than 100 tables...
Anyway, here's the error thrown when creating the SessionFactory (the code is at the end of this post)
The entity 'FilterConfig' doesn't have an Id mapped.
Use the Id method to map your identity property. For example: Id(x => x.Id).
Entities (I hope I created them correctly):
public partial class UserLogin
{
public UserLogin()
{
this.UserMessages = new List<UserMessage>();
this.UserMessagesReceivers = new List<UserMessagesReceiver>();
}
public virtual int ID { get; set; }
public virtual int UserTypeID { get; set; }
public virtual int? StudentID { get; set; }
public virtual int? HeadmasterID { get; set; }
public virtual int? ParentID { get; set; }
public virtual string UniqueID { get; set; }
public virtual bool ShowMyPhoneNumber { get; set; }
public virtual bool IsBanned { get; set; }
public virtual string Login { get; set; }
public virtual string Password { get; set; }
public virtual bool WasPasswordSent { get; set; }
public virtual string Email { get; set; }
public virtual string UserPicture { get; set; }
public virtual IList<UserMessage> UserMessages { get; set; }
public virtual IList<UserMessagesReceiver> UserMessagesReceivers { get; set; }
}
public partial class UserMessage
{
public UserMessage()
{
this.UserMessagesReceivers = new List<UserMessagesReceiver>();
this.UserMessagesReplies = new List<UserMessagesReply>();
}
public virtual int ID { get; set; }
public virtual DateTime Date { get; set; }
public virtual DateTime? LastCheckDate { get; set; }
public virtual int UserLoginID { get; set; }
public virtual string Description { get; set; }
public virtual bool HasNonCheckedReplies { get; set; }
public virtual UserLogin UserLogin { get; set; }
public virtual IList<UserMessagesReceiver> UserMessagesReceivers { get; set; }
public virtual IList<UserMessagesReply> UserMessagesReplies { get; set; }
}
public partial class UserMessagesReceiver
{
public UserMessagesReceiver()
{
this.WasMessageChecked = false;
this.UserMessagesReplies = new List<UserMessagesReply>();
}
public virtual int ID { get; set; }
public virtual int UserMessagesID { get; set; }
public virtual int ReceiverLoginID { get; set; }
public virtual bool WasMessageChecked { get; set; }
public virtual DateTime? LastCheckedDate { get; set; }
public virtual UserLogin UserLogin { get; set; }
public virtual UserMessage UserMessage { get; set; }
public virtual IList<UserMessagesReply> UserMessagesReplies { get; set; }
}
public partial class UserMessagesReply
{
public UserMessagesReply()
{
}
public virtual int ID { get; set; }
public virtual DateTime Date { get; set; }
public virtual int UserMessagesID { get; set; }
public virtual int? UserMessagesReceiverID { get; set; }
public virtual string Description { get; set; }
public virtual UserMessage UserMessage { get; set; }
public virtual UserMessagesReceiver UserMessagesReceiver { get; set; }
}
Configuration:
public class AutomappingConfiguration : DefaultAutomappingConfiguration
{
public override bool IsId(Member member)
{
return member.Name == member.DeclaringType.Name + "ID";
}
}
private static AutoPersistenceModel CreateAutomappings()
{
return AutoMap.AssemblyOf<AutomappingConfiguration>(new AutomappingConfiguration());
}
private static ISessionFactory CreateSessionFactory()
{
var cfg = new AutomappingConfiguration();
return Fluently.Configure()
.Database(MySQLConfiguration.Standard
.ConnectionString("..."))
.Mappings(m => m.AutoMappings
.Add(AutoMap.AssemblyOf<UserLogin>(cfg))
.Add(AutoMap.AssemblyOf<UserMessage>(cfg))
.Add(AutoMap.AssemblyOf<UserMessagesReceiver>(cfg))
.Add(AutoMap.AssemblyOf<UserMessagesReply>(cfg)))
.BuildSessionFactory();
}
in the configuration you said that the Ids are named like UserLoginID but in the class they are defined as public virtual int ID { get; set; } so change
return member.Name == member.DeclaringType.Name + "ID";
to
return member.Name == "ID";
Some additional info:
CreateAutomappings() seems to be not used
AutomappingConfiguration should at least override ShouldMap(Member) to filter on the namespace (e.g. member.Namespace.StartsWith(typeof(UserMessage).Namespace)) otherwise sooner or later utility classes and the like will be mapped as well
AutoMap.AssemblyOf<> should be called per assembly containing types not per type
I have several cases where my navigation property is repeated in a class, or I don't want it to have the same name as the class it represents. Example:
public class Employee
{
public Guid EmployeeId { get; set; }
public string Name { get; set; }
}
public class Project
{
public Guid ProjectId { get; set; }
public DateTime Start { get; set; }
public Guid ResponsibleId { get; set; }
public virtual Employee Responsible { get; set; }
public Guid OwnerId { get; set; }
public virtual Employee Owner { get; set; }
}
When using EF Code First, it messes up the foreign keys, creates new ones with different names. How do I handle this?
Thanks a lot!
This should help:
public class Employee
{
public Guid EmployeeId { get; set; }
public string Name { get; set; }
public virtual ICollection<Project> ResponsibleProjects { get; set; }
public virtual ICollection<Project> OwnedProjects { get; set; }
}
public class Project
{
public Guid ProjectId { get; set; }
public DateTime Start { get; set; }
public Guid ResponsibleId { get; set; }
public virtual Employee Responsible { get; set; }
public Guid OwnerId { get; set; }
public virtual Employee Owner { get; set; }
}
public YourContext : DbContext
{
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Project>()
.HasRequired(p => p.Owner)
.WithMany(e => e.OwnedProjects )
.HasForeignKey(p => p.OwnerId );
modelBuilder.Entity<Project>()
.HasRequired(p => p.Responsible)
.WithMany(e => e.ResponsibleProjects )
.HasForeignKey(p => p.ResponsibleId );
base.OnModelCreating(modelBuilder);
}
Note how relations are defined for both ends and how I point what exact field is used as a foreign key.
I ended up doing this, which works:
public class Employee
{
public Guid EmployeeId { get; set; }
public string Name { get; set; }
}
public class Project
{
public Guid ProjectId { get; set; }
public DateTime Start { get; set; }
public Guid ResponsibleId { get; set; }
[ForeignKey("ResponsibleId")]
public virtual Employee Responsible { get; set; }
public Guid OwnerId { get; set; }
[ForeignKey("OwnerId")]
public virtual Employee Owner { get; set; }
}
Thanks to Wiktor for the comment that lead to the solution.
I a am new to entity framework. I have created project with Entity Model. When i am trying to add item in to the table it gives error "Multiplicity Constraint violated" Any idea?
ID From Table MAPPER is FK in MAPS table.
In Code Behind:
private Mapper mMapper;
if (mMapper.Id == 0)
db.Mappers.Add(mMapper);
db.SaveChanges();
public partial class Mapper
{
public Mapper()
{
this.Maps = new HashSet<Map>();
}
public int Id { get; set; }
public string Name { get; set; }
public string RecordDelimiter { get; set; }
public string ValueDelimiter { get; set; }
public Nullable<int> ColumnDescriptionRow { get; set; }
public Nullable<int> FirstRowOfData { get; set; }
public Nullable<bool> IgnoreThisRecord { get; set; }
public Nullable<bool> ExplodePartQuantity { get; set; }
public Nullable<bool> IgnoreImportingErrors { get; set; }
public Nullable<int> AngleMappingLeadingEdgeId { get; set; }
public Nullable<int> AngleMappingTrailingEdgeId { get; set; }
public string ValueWrapper { get; set; }
public string ValueWrapperDelimiter { get; set; }
public virtual AngleMapping AngleMapping { get; set; }
public virtual AngleMapping AngleMapping1 { get; set; }
public virtual ICollection<Map> Maps { get; set; }
}
Help Appreciated!