I'm learning ASP.NET Core Web API and Entity Framework Core. Currently, I'm stuck figuring out how to populate the foreign keys with the actual values, as shown below.
Current Result:
Desired Result:
fkSecuritySecurityTypeId and fkSecurityExchangeId are populated.
DatabaseContext.cs:
The DatabaseContext class was built using dotnet ef dbcontext scaffold. Here's a portion of it:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Security>(entity =>
{
entity.HasOne(d => d.FkSecurityExchange)
.WithMany(p => p.Securities)
.HasForeignKey(d => d.FkSecurityExchangeId)
.OnDelete(DeleteBehavior.ClientSetNull);
entity.HasOne(d => d.FkSecuritySecurityType)
.WithMany(p => p.Securities)
.HasForeignKey(d => d.FkSecuritySecurityTypeId)
.OnDelete(DeleteBehavior.ClientSetNull);
});
Research:
AutoInclude() seems like the solution. I'm having a hard time understanding how to use AutoInclude() in my code since obviously my code is a bit different from how the docs use AutoInclude.
Questions:
Is AutoInclude() the correct approach ?
If so, how should it be used in this case ?
Thanks for your help.
Related
I am migrating my project from Entity Framework to EF Core 6 but now I am stuck at this point.
modelBuilder.Entity<tblStoreGroup>()
.HasMany(e => e.tblUsers)
.WithMany(e => e.tblStoreGroups)
.Map(m => m.ToTable("tblBridgeUserGroup")
.MapLeftKey("GroupID")
.MapRightKey("username"));
Because the Map() property is not available in EF Core, can someone please provide a solution for this code?
I am a beginner in Entity Framework.
Thanks in advance
You can try using UsingEntity:
modelBuilder.Entity<tblStoreGroup>()
.HasMany(p => p.tblUsers)
.WithMany(p => p.tblStoreGroups)
.UsingEntity<Dictionary<string, object>>(
"tblBridgeUserGroup",
j => j
.HasOne<tblUser>()
.WithMany()
.HasForeignKey("username"),
j => j
.HasOne<tblStoreGroup>()
.WithMany()
.HasForeignKey("GroupID"));
See Joining relationships configuration section of the docs.
i have table Asp_net_users which is many-to-many relation with table Clients. There are no mapped object in between them, it been auto -generated by EF:
modelBuilder.Entity<Client>(entity =>
{
entity.Property(e => e.State)
.HasConversion<string>();
entity.HasMany(d => d.Users)
.WithMany(p => p.Clients)
.UsingEntity<Dictionary<string, object>>(
"ClientUser",
l => l.HasOne<AspNetUser>().WithMany().HasForeignKey("UserId"),
r => r.HasOne<Client>().WithMany().HasForeignKey("ClientId"),
j =>
{
j.HasKey("ClientId", "UserId");
j.ToTable("client_users"); // ,"identity"
j.IndexerProperty<string>("ClientId");
j.IndexerProperty<string>("UserId");
});
});
The code above generating table client_users which i don't want in my migration.
I've tried to add to code above:
.Metadata
.SetIsTableExcludedFromMigrations(true)
no luck.
I know I can exclude using this method
modelBuilder.Entity<AspNetUser>().ToTable("asp_net_users", "identity", t => t.ExcludeFromMigrations());
but the problem is: above mentioned table is auto generated and I don't know how to do ToTable on it.
tried
modelBuilder.Entity().ToTable("client_users", t => t.ExcludeFromMigrations());
but it don't compile. modelBuilder.Entity() wants to have an object.
Please help
I added j.Metadata.SetIsTableExcludedFromMigrations(true); inside and it worked:
entity.HasMany(d => d.Users)
.WithMany(p => p.Clients)
...
j =>
{
...
j.Metadata.SetIsTableExcludedFromMigrations(true);
});
Im upgrating from Entity Framework Core 2 to Entity Framework Core 3. And I have this error:
Error CS0103 The name 'RelationalReferenceCollectionBuilderExtensions'
does not exist in the current context
The error is on method OnModelCreating(ModelBuilder modelBuilder), this is the code:
modelBuilder.Entity<Person>(entity =>
{
//some props
RelationalReferenceCollectionBuilderExtensions.HasConstraintName((ReferenceCollectionBuilder)entity
.HasOne(d => d.RuleCodeNavigation)
.WithMany(p => p.Person)
.HasForeignKey(d => d.RuleCode)
.OnDelete(DeleteBehavior.ClientSetNull), "FK_Person_Rules");
});
It seems the class RelationalReferenceCollectionBuilderExtensions does not exist in EF Core 3.
Any idea how I can fix this?
Not sure what happened to RelationalReferenceCollectionBuilderExtensions, but the suggested method to name your constraints is this
modelBuilder.Entity<Person>(entity =>
{
//some props
entity
.HasOne(d => d.RuleCodeNavigation)
.WithMany(p => p.Person)
.HasForeignKey(d => d.RuleCode)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Person_Rules");
});
I guess withmany and withoptional both will be wrong
modelBuilder.Entity<Student>().HasRequired(c =>
c.Studentaccount).WithMany(s => s.student).HasForeignKey(s => s.StudentId);
HasOptional
modelBuilder.Entity<Student>().HasRequired(c => c.Studentaccount).HasOptional(s => s.student);
For all the relationship in EF you can have a look to the official MSDN page
https://msdn.microsoft.com/en-us/data/jj591620.aspx
I have 3 Entities Roles, Modules and Permissions and I am following code first approach using EF 6
Roles has RoleID , Modules has ModuleID and Permissions has PermissionID as Keys.
Now I want Map these 3 ID values to another mapping table RoleAccess on creating Role
I am able to map entity to with ICollection property and the same is not working for the above scenario.
help me out with code suggestions...
The configuration i am trying add is below..
'this is the mapping configuration i am trying `this.ToTable("Roles");
//this.HasKey(c => c.Id)
// .HasMany(c => c.Permissions)
// .WithRequired()
// .HasForeignKey(c => new { c.SubModuleId, c.EntitlementTypeId });
this.HasMany(a => new[] {a.SubModules,a.EntitlementTypes})
.WithMany(b => b.Roles)
.Map(mc =>
{
mc.ToTable("Permissions");
mc.MapLeftKey("RoleId");
mc.MapRightKey(new[] { "SubModuleId", "EntitlementTypeId" });
});`'