Invalid Object Name error when creating database with EF Code First - entity-framework-core

Question

Hello i am developing a database using EF Core Code First.I keep getting this error when generating the database :
Microsoft.EntityFrameworkCore.DbUpdateException: 'An error occurred
while updating the entries. See the inner exception for details.'
InnerException {"Invalid object name 'Parents'."} System.Exception {Microsoft.Data.SqlClient.SqlException}
From what i have read it seems i can not create the database because the tables are somehow pluralized.
I have searched for solutions including this SO thread and tried the solutions to no avail. The one that i have not tried is the RemovePluralization method because
I do not have this Conventions field in my ModelBuilder and i can not find the package containing it.
Context and Models
public class Parent {
public int ID { get; set; }
public string Name { get; set; }
public ICollection<Child> Children { get; set; }
public Parent() {
this.Children = new List<Child>();
}
}
public class Child {
public int ID { get; set; }
public string Name { get; set; }
public Parent Parent { get; set; }
public int ParentId { get; set; }
}
public class MyContext : DbContext {
public virtual DbSet<Parent> Parents { get; set; }
public virtual DbSet<Child> Children { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder) {
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Child>()
.HasKey(x => x.ID);
modelBuilder.Entity<Parent>()
.HasKey(x => x.ID);
modelBuilder.Entity<Parent>()
.HasMany(x => x.Children)
.WithOne(k=>k.Parent)
.HasForeignKey(t => t.ParentId);
}
public MyContext(DbContextOptions options):base(options) {
this.Database.EnsureCreated();
this.Database.Migrate(); //i have tried this too
}
}
Usage
var optionsBuilder = new DbContextOptionsBuilder<MyContext>();
optionsBuilder.UseSqlServer(connectionString);
MyContext context = new MyContext(optionsBuilder.Options);
Parent parent = new Parent() { Name = "Parentino" };
context.Parents.Add(parent);
await context.SaveChangesAsync(); //crashes with before mentioned error
I have also tried to set the table names in my OnModelCreating overload this:
modelBuilder.Entity<Parent>().ToTable("parent");
or directly with [Table("name")] attribute over my Model classes to no avail.
Could someone help me out and tell me why i can't generate the database ?

Answer 1

Works fine for me
program.sc
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace ConsoleApp1
{
class Program
{
static async Task Main(string[] args)
{
string connectionString = "Server=(localdb)\\MSSQLLocalDB;Initial Catalog=test;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
var optionsBuilder = new DbContextOptionsBuilder<MyContext>();
optionsBuilder.UseSqlServer(connectionString);
MyContext context = new MyContext(optionsBuilder.Options);
Parent parent = new Parent() { Name = "Parentino" };
context.Parents.Add(parent);
await context.SaveChangesAsync(); //crashes with before mentioned error }
}
}
public class Parent
{
public int ID { get; set; }
public string Name { get; set; }
public ICollection<Child> Children { get; set; }
public Parent()
{
this.Children = new List<Child>();
}
}
public class Child
{
public int ID { get; set; }
public string Name { get; set; }
public Parent Parent { get; set; }
public int ParentId { get; set; }
}
public class MyContext : DbContext
{
public virtual DbSet<Parent> Parents { get; set; }
public virtual DbSet<Child> Children { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Child>()
.HasKey(x => x.ID);
modelBuilder.Entity<Parent>()
.HasKey(x => x.ID);
modelBuilder.Entity<Parent>()
.HasMany(x => x.Children)
.WithOne(k => k.Parent)
.HasForeignKey(t => t.ParentId);
}
public MyContext(DbContextOptions options) : base(options)
{
this.Database.EnsureCreated();
this.Database.Migrate(); //i have tried this too
}
}
}
ConsoleApp1.csproj
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.0">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
</ItemGroup>
</Project>