I am new to EF Core and am trying to use TPH Inheritance with Entity Framework Core
I have the following classes defined
public class WorkItem {
public Guid Id { get; set; }
public string WorkItemType { get; set; }
public string Description { get; set; }
}
public class Job : WorkItem {
public string BillingNotes { get; set; }
}
In my context, I have
public class JobContextNew : DbContext {
public virtual DbSet<WorkItem> WorkItem { get; set; }
public virtual DbSet<Job> Job { get; set; }
public JobContextNew(DbContextOptions<JobContextNew> options) : base(options) { }
protected override void OnModelCreating(ModelBuilder modelBuilder) {
modelBuilder.Entity<WorkItem>(entity => entity.Property(e => e.Id).ValueGeneratedNever());
modelBuilder.Entity<WorkItem>()
.HasDiscriminator(workitem => workitem.WorkItemType)
.HasValue<Job>(nameof(Job));
}
}
If I omit the field in Job, it will pull the data just fine but when I add the BillngNotes back in I get the following error: Invalid column name 'BillingNotes
Can anyone tell me what I might be doing wrong?
Related
I'm creating a CRUD project in asp.net entity framework, and from my understanding, in order to see the data on the HTML page I have to scaffold the pages. For example I have two entity models Student and Major
This is the Student entity
public class Student
{
public int Id { get; set; }
public string Name { get; set; }
[ForeignKey("Major")]
public int? MajorId { get; set; }
public Major Major { get; set; }
[ForeignKey("Advisor")]
public int AdvisorId { get; set; }
public Advisor Advisor { get; set; }
public ICollection<StudentCourses>? StudentCourses { get; set; }
}
This is the Major entity
public class Major
{
public int MajorId { get; set; }
public string MajorName { get; set; }
public ICollection<Student> Students { get; set; }
public ICollection<Advisor> Advisors { get; set; }
public ICollection<MajorCourse> MajorCourses { get; set; }
}
If I want to see the Student data I have to create a Students folder and add a new Scaffolding along with a DbContext like your_namespace.Data.StudentContext. I would also have to follow the same steps for the Major entity but am I correct to use another DbContext? For example: your_namespace.Data.MajorContext. This is what I have done but when I try to make migrations and update the database in the your_namespace.Data.MajorContext, I get an error that reads SQLite Error 1: 'table "StudentCourses" already exists'.`
How do I fix this error?
I should also add the Context classes:
This is the StudentContext class:
public class AdvismentContext : DbContext
{
public AdvismentContext(DbContextOptions<AdvismentContext> options)
: base(options)
{
}
public DbSet<Student> Students { get; set; }
public DbSet<Major> Majors { get; set; }
public DbSet<Advisor> Advisors { get; set; }
public DbSet<Course> Courses { get; set; }
public DbSet<MajorCourse> MajorCourses { get; set; }
public DbSet <StudentCourses> StudentCourses{ get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Student>()
.ToTable("Students");
modelBuilder.Entity<Major>()
.ToTable("Majors");
modelBuilder.Entity<Advisor>()
.ToTable("Advisors");
modelBuilder.Entity<Course>()
.ToTable("Courses");
//modelBuilder.Entity<MajorCourse>()
// .ToTable("MajorCourse");
//.HasKey(mc => new { mc.MajorId, mc.CourseId });
}
And this is the MajorContext class:
public class MajorContext : DbContext
{
public MajorContext (DbContextOptions<MajorContext> options)
: base(options)
{
}
public DbSet<Advisment.Models.Major> Major { get; set; } = default!;
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Major>()
.ToTable("Major");
//modelBuilder.Entity<MajorCourse>() This is commented out because I was getting the same error that the table already exists.
// .ToTable("MajorCourse");
}
}
What am I doing wrong?
I am trying to add a circular relationship in my project. I have the following problem:
My database consists of a table with bookings (on a specific machine). Since the machines can handle multiple bookings at once, I have another table that stores all the (overlapping) parallel bookings. How can I now attach the overlapping bookings to the original booking element? I would like to access the overlaps like this:
var bookings = dbContext.Booking.Include(x => x.OverlapBookings).ToList();
foreach (var booking in bookings)
{
var overlaps = booking.OverlapBookings;
...
However, when trying to add the migration, I am running into the following error:
Unable to determine the relationship represented by navigation 'BookingDbModel.OverlapBookings' of type 'ICollection'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.
How can I now define this circular relationship?
Here are the classes:
public class BookingDbModel
{
public int id { get; set; }
public string Name { get; set; }
public string Client { get; set; }
public string Machine { get; set; }
public DateTime StartTime { get; set; }
public DateTime EndTime { get; set; }
public ICollection<OverlapBookingDbModel> OverlapBookings { get; set; }
}
and
public class OverlapBookingDbModel
{
public int OriginalBookingId { get; set; }
public BookingDbModel OriginalBooking { get; set; }
public int TargetBookingId { get; set; }
public BookingDbModel TargetBooking { get; set; }
}
With the following manual relationship definition, the entity updated successfully and all the models are now accessible with only one dbContext call:
DbContext.cs
public class ApplicationDbContext : DbContext
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
public DbSet<BookingDbModel> Booking { get; set; }
public DbSet<OverlapBookingDbModel> OverlapBooking { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<OverlapBookingDbModel>()
.HasOne(p => p.OriginalBooking)
.WithMany(b => b.OverlapBookings)
.HasForeignKey(k => k.OriginalBookingId);
base.OnModelCreating(modelBuilder);
}
}
I can now access all related Overlapbookings like this:
var testbookings = dbContext.Booking.Include(x => x.OverlapBookings).ThenInclude(y => y.TargetBooking).FirstOrDefault(x => x.Id == 12);
My apologies for (perhaps) not using the right terms in the title and this post.
The problem is as follows:
I have a POCO class which has a reference to another table (which is read only). This table has a one-to-one relationship with the other table.
I have set this upo as follow:
public class Commodity
{
public Commodity()
{
}
public long CommodityID { get; set; }
public long CommodityMaterialID { get; set; }
public decimal? SpecficWeight { get; set; }
public OmsCommodityMaterial OmsCommodityMaterial { get; set; }
}
The OmsCommodityMaterial property is the referenced table. This referenced table is also a POCO class which has some other fields, and a porperty back to my own (Commodity) table so I can make a one-to-one relationship with Fluent:
public class OmsCommodityMaterial : OmsBaseClass
{
public OmsCommodityMaterial()
{
}
public long? CommodityMaterialID { get; set; }
public long? CommodityID { get; set; }
public string Name { get; set; }
public long? SortOrder { get; set; }
public Commodity Commodity { get; set; }
}
Fluent (for the one-to-one relation) is set up as follows:
public class MyContext : IdentityDbContext<ApplicationUser>
{
public virtual DbSet<Commodity> Commodity { get; set; }
// Oms classes:
public virtual DbSet<OmsCommodityMaterial> OmsCommodityMaterial { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
base.OnConfiguring(optionsBuilder);
}
public MyContext(DbContextOptions<MyContext> options)
: base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Commodity>(entity =>
{
entity.Property(e => e.CommodityID)
.HasColumnName("CommodityID")
.ValueGeneratedOnAdd();
entity.Property(e => e.CommodityMaterialID)
.HasColumnName("CommodityMaterialID");
entity.Property(e => e.SpecficWeight)
.HasColumnName("SpecficWeight")
.HasColumnType("decimal(18, 2)");
entity.HasOne(a => a.OmsCommodityMaterial)
.WithOne(b => b.Commodity)
.HasForeignKey<Commodity>(b => b.CommodityMaterialID);
});
}
}
In my endpoint I want to do a GET of all values which return the specific fields of my own table (Commodity) and all the fields of the referenced table (OmsCommodityMaterial).
For this purpose I created a ViewModel (also because else I get a circular reference as I found out in this post: ERR_CONNECTION_RESET returning Async including object child collections) which looks as follow:
public class CommodityViewModel
{
public long CommodityID { get; set; }
public long CommodityMaterialID { get; set; }
public decimal? SpecficWeight { get; set; }
public OmsCommodityMaterial OmsCommodityMaterial { get; set; }
}
For the ViewModels I am using AutoMapper, but I actually have no clue how I can map / return the list of the above ViewModel.
UPDATE
I ended up eliminating the Circular reference error by adding the [JsonIgnore] attribute to the public virtual Commodity Commodity { get; set; } property in the OmsCommodityMaterial POCO class. Now I can get all the needed column values:
return await this.Context.Commodity
.Include(i => i.OmsCommodityMaterial)
.ToListAsync();
Though, I suppose this is not the way to go. There should be a better solution for this by creating a ViewModel that retrieves the Commodity columns and (some) of the referenced OmsCommodityMaterial columns without falling in the Circular Reference error, but how (using AutoMapper)?
I have a postgres database and using asp.net core mvc (+ ef). The database is created correctly. I have two tables 'Module' and 'ModuleMenu'. I want to get all the menu's for a given module but I keep on failing to create the linq query.
Situation
Model: Module.cs
namespace project.Model
{
public class Module
{
[Required]
public string ID { get; set; }
[Required]
public string Name { get; set; }
[Required]
public string Description { get; set; }
}
}
Model: ModuleMenu.cs
namespace project.Models
{
public class ModuleMenu
{
[Required]
public string ID { get; set; }
public int ModuleID { get; set; }
[Required]
public string Title { get; set; }
[ForeignKey("ModuleID")]
public virtual Module Module { get; set; }
}
}
ApplicationDbContext.cs
namespace project.Data
{
public class ApplicationDbContext
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
}
public DbSet<Module> Modules { get; set; }
public DbSet<ModuleMenu> ModuleMenus { get; set; }
}
}
Query
public List<ModuleMenu> GetModuleMenus(){
var query = from m in _dbContext.ModuleMenus
join mod in _dbContext.Modules on
m.ModuleID equals mod.ID
select m;
return query.ToList();
}
Error
fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[0]
An exception was thrown attempting to execute the error handler.
System.NullReferenceException: Object reference not set to an instance of an object.
Can anyone help me to correctly create the query?
Is this part correct in your code?
public int ModuleID { get; set; }
It seems that you might have had an error in the type used for the fk.
Below I changed the type to be string rather than int.
public string ModuleID { get; set; }
based on that update, the query could look like this.
public ModuleMenu[] GetModuleMenusForModule(string moduleId)
{
return _dbContext.ModuleMenus.Where(x => x.ModuleID == moduleId).ToArray();
}
I would expect that model to error (ModelID and ID are incompatible types). If that were correct, your code should work. Or simpler:
public List<ModuleMenu> GetModuleMenus()
{
return _dbContext.ModuleMenus.ToList();
}
I am relatively new to the Code First approach to Entity Framework. I have used the Database First approach for a while now, but the Code First seems to be a better fit for the application I am currently developing. I am working with an existing MS SQL database, and I am not allowed to make any changes whatsoever to the database. The reason why I am using Code First is because the Fluent API allows me to dynamically assign a table name to a class.
That said, I have a predicament where I need to assign a relationship between 2 tables. One table, ArCodes, has a composite key made up of the CodeType and the Code (both are strings). The CodeType column determins the type of code and the Code column is the identifier unique to the code type.
public class ArCode {
[Column("cod_typ", Order = 0), Key]
public string CodeType { get; set; }
[Column("ar_cod", Order = 1), Key]
public string Code { get; set; }
[Column("desc")]
public string Description { get; set; }
}
The other table, Invoices, needs to have a relationship to the ArCodes table for both a "ship via" code and a "terms" code.
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("shp_via_cod")]
public string ShipViaCode { get; set; }
public ArCode ShipVia { get; set; }
[Column("terms_cod")]
public string TermsCode { get; set; }
public ArCode Terms { get; set; }
}
I would like to setup the relationship for both the "ShipVia" property and the "Terms" property. However, I am not sure how to do so in regards to the CodeType portion of the composite key. For "ship via" codes the Code Type should be "S", and code "terms" codes, the code type should be "T".
I have tried the following in by DB Context, but it did not work:
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
// setup the table names
modelBuilder.Entity<ArCode>().ToTable("ARCODS" + CompanyCode);
modelBuilder.Entity<Invoice>().ToTable("IHSHDR" + CompanyCode);
//
// setup the relationships
//
// 1 Invoice <--> 0-1 Ship Via AR Codes
modelBuilder.Entity<Invoice>()
.HasOptional(invoice => invoice.ShipVia)
.WithMany()
.HasForeignKey(invoice => new { TheType = "S", invoice.ShipViaCode })
;
base.OnModelCreating(modelBuilder);
}
Any help would be appreciated.
Update #1
Ok, I reduced my code to its simplest form, and I followed the solution as provided by #GertArnold.
public abstract class ArCode {
[Column("cod_typ")]
public string CodeType { get; set; }
[Column("ar_cod")]
public string Code { get; set; }
[Column("terms_desc")]
public string TermsDescription { get; set; }
[Column("terms_typ")]
public string TermsType { get; set; }
[Column("shp_via_desc")]
public string ShipViaDescription { get; set; }
[Column("tax_desc")]
public string TaxDescription { get; set; }
}
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("hdr_invc_dat")]
public DateTime InvoiceDate { get; set; }
[Column("shp_via_cod")]
public string ShipViaCode { get; set; }
public ShipViaCode ShipVia { get; set; }
[Column("terms_cod")]
public string TermsCode { get; set; }
public TermsCode Terms { get; set; }
public Invoice() {
}
}
public class PbsContext : DbContext {
public DbSet<Invoice> Invoices { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<ArCode>().HasKey(r => r.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public PbsContext()
: base("name=PbsDatabase") {
}
}
However, the following code returns an error:
PbsContext context = new PbsContext();
var invoice = context.Invoices.OrderByDescending(r => r.InvoiceDate).FirstOrDefault();
error 3032: Problem in mapping fragments starting at line 28:Condition member 'ArCode.cod_typ' with a condition other than 'IsNull=False' is mapped. Either remove the condition on ArCode.cod_typ or remove it from the mapping.
If I remove the "CodeType" column from the ArCode class and change all "CodeType" references to the database column name of "cod_typ" within the OnModelCreating event, then the statement above executes without error. However, invoice.ShipVia and invoice.Terms will both be null event though there is a matching record in the database.
Update #2
public abstract class ArCode {
[Column("ar_cod")]
public string Code { get; set; }
[Column("terms_desc")]
public string TermsDescription { get; set; }
[Column("terms_typ")]
public string TermsType { get; set; }
[Column("shp_via_desc")]
public string ShipViaDescription { get; set; }
[Column("tax_desc")]
public string TaxDescription { get; set; }
}
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("hdr_invc_dat")]
public DateTime InvoiceDate { get; set; }
[Column("shp_via_cod")]
public ShipViaCode ShipVia { get; set; }
[Column("terms_cod")]
public TermsCode Terms { get; set; }
public Invoice() {
}
}
public class PbsContext : DbContext {
public DbSet<Invoice> Invoices { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<ArCode>().HasKey(r => r.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public PbsContext()
: base("name=PbsDatabase") {
}
}
Now, the following code returns an error:
PbsContext context = new PbsContext();
var invoice = context.Invoices.OrderByDescending(r => r.InvoiceDate).FirstOrDefault();
EntityCommandExecutionException - Invalid column name 'ShipVia_Code'. Invalid column name 'Terms_Code'.
What you want is impossible for EF. ArCode has a composite key, so any association to it will have to use two Properties. That means that in Invoice you'd need four properties (two pairs) to refer to the two ArCode objects. But two of these properties (those for CodeType) are not backed up by columns in the database, so EF can not map them.
But... there is a way that may help you out. You could create two derived classes from ArCode and let Invoice refer to those by single-property associations. But then you have to divert from the model as such and fool EF a bit by defining a single key:
public abstract class ArCode { ... } // abstract!
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<Invoice>().HasOptional(i => i.Terms).WithOptionalDependent().Map(m => m.MapKey("terms_cod"));
modelBuilder.Entity<Invoice>().HasOptional(i => i.ShipVia).WithOptionalDependent().Map(m => m.MapKey("shp_via_cod"));
modelBuilder.Entity<ArCode>().HasKey(a => a.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public class Invoice
{
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
public ShipViaCode ShipVia { get; set; }
public TermsCode Terms { get; set; }
}
This may work for you if you don't have to insert ARCODS records through EF. It won't allow you to insert records with identical Codes, although the database would allow it. But I expect the content of ARCODS to be pretty stable and maybe it is enough to fill it with a script.