Is it possible to rename or configure the discriminator column when using iheritance in Entity Framework?
I have a database with a table that contains the column of my POCO class
public class TypeOf
{
[Key, Column(Order = 0)]
public string Type { get; set; }
[Key, Column(Order = 1)]
public string Key { get; set; }
public string Value { get; set; }
}
This table already contains a lot of data
HsCode | HP | 4821 1000
SubCode | 423 | T21
SubCode | 022 | 5XL
ProductionLine | X1 | Line one
ProductionLine | X2 | Line two
Country | CN | China
Country | IN | India
…
I would like to improve this by creating inheritance system of TypeOf
public class Country : TypeOf { }
public class ProductionLine : TypeOf { }
public class SubCode : TypeOf { }
public class HsCode : TypeOf { }
By using the "Type" column as discriminator.
At this moment when I start to use the inheritance the db migration still want to use a Discriminator column.
public partial class TypeOf : DbMigration
{
public override void Up()
{
AddColumn("dbo.TypeOfs", "Discriminator", c => c.String(nullable: false, maxLength: 128));
}
public override void Down()
{
DropColumn("dbo.TypeOfs", "Discriminator");
}
}
entity-framework-6
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
add a comment |
I have a database with a table that contains the column of my POCO class
public class TypeOf
{
[Key, Column(Order = 0)]
public string Type { get; set; }
[Key, Column(Order = 1)]
public string Key { get; set; }
public string Value { get; set; }
}
This table already contains a lot of data
HsCode | HP | 4821 1000
SubCode | 423 | T21
SubCode | 022 | 5XL
ProductionLine | X1 | Line one
ProductionLine | X2 | Line two
Country | CN | China
Country | IN | India
…
I would like to improve this by creating inheritance system of TypeOf
public class Country : TypeOf { }
public class ProductionLine : TypeOf { }
public class SubCode : TypeOf { }
public class HsCode : TypeOf { }
By using the "Type" column as discriminator.
At this moment when I start to use the inheritance the db migration still want to use a Discriminator column.
public partial class TypeOf : DbMigration
{
public override void Up()
{
AddColumn("dbo.TypeOfs", "Discriminator", c => c.String(nullable: false, maxLength: 128));
}
public override void Down()
{
DropColumn("dbo.TypeOfs", "Discriminator");
}
}
entity-framework-6
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14
add a comment |
I have a database with a table that contains the column of my POCO class
public class TypeOf
{
[Key, Column(Order = 0)]
public string Type { get; set; }
[Key, Column(Order = 1)]
public string Key { get; set; }
public string Value { get; set; }
}
This table already contains a lot of data
HsCode | HP | 4821 1000
SubCode | 423 | T21
SubCode | 022 | 5XL
ProductionLine | X1 | Line one
ProductionLine | X2 | Line two
Country | CN | China
Country | IN | India
…
I would like to improve this by creating inheritance system of TypeOf
public class Country : TypeOf { }
public class ProductionLine : TypeOf { }
public class SubCode : TypeOf { }
public class HsCode : TypeOf { }
By using the "Type" column as discriminator.
At this moment when I start to use the inheritance the db migration still want to use a Discriminator column.
public partial class TypeOf : DbMigration
{
public override void Up()
{
AddColumn("dbo.TypeOfs", "Discriminator", c => c.String(nullable: false, maxLength: 128));
}
public override void Down()
{
DropColumn("dbo.TypeOfs", "Discriminator");
}
}
entity-framework-6
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
I have a database with a table that contains the column of my POCO class
public class TypeOf
{
[Key, Column(Order = 0)]
public string Type { get; set; }
[Key, Column(Order = 1)]
public string Key { get; set; }
public string Value { get; set; }
}
This table already contains a lot of data
HsCode | HP | 4821 1000
SubCode | 423 | T21
SubCode | 022 | 5XL
ProductionLine | X1 | Line one
ProductionLine | X2 | Line two
Country | CN | China
Country | IN | India
…
I would like to improve this by creating inheritance system of TypeOf
public class Country : TypeOf { }
public class ProductionLine : TypeOf { }
public class SubCode : TypeOf { }
public class HsCode : TypeOf { }
By using the "Type" column as discriminator.
At this moment when I start to use the inheritance the db migration still want to use a Discriminator column.
public partial class TypeOf : DbMigration
{
public override void Up()
{
AddColumn("dbo.TypeOfs", "Discriminator", c => c.String(nullable: false, maxLength: 128));
}
public override void Down()
{
DropColumn("dbo.TypeOfs", "Discriminator");
}
}
entity-framework-6
entity-framework-6
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
edited Nov 22 '18 at 10:14
Bastien Vandamme
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
asked Nov 22 '18 at 8:45
Bastien VandammeBastien Vandamme
6,1832167126
6,1832167126
As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14
add a comment |
As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14
As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14
As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14
add a comment |
1 Answer
1
active
oldest
votes
It's possible, although not so intuitive (IMHO, for EF designers it might seem logical and obvious).
You need to use Map fluent API and repeat Requires(e => e.Type).HasValue() for all derived types (and also the base type if it is not abstract).
For the sample model from the post it should be:
modelBuilder.Entity<TypeOf>()
.Map(m => m.Requires(e => e.Type).HasValue())
.Map<Country>(m => m.Requires(e => e.Type).HasValue())
.Map<ProductionLine>(m => m.Requires(e => e.Type).HasValue())
.Map<SubCode>(m => m.Requires(e => e.Type).HasValue())
.Map<HsCode>(m => m.Requires(e => e.Type).HasValue())
;
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It's possible, although not so intuitive (IMHO, for EF designers it might seem logical and obvious).
You need to use Map fluent API and repeat Requires(e => e.Type).HasValue() for all derived types (and also the base type if it is not abstract).
For the sample model from the post it should be:
modelBuilder.Entity<TypeOf>()
.Map(m => m.Requires(e => e.Type).HasValue())
.Map<Country>(m => m.Requires(e => e.Type).HasValue())
.Map<ProductionLine>(m => m.Requires(e => e.Type).HasValue())
.Map<SubCode>(m => m.Requires(e => e.Type).HasValue())
.Map<HsCode>(m => m.Requires(e => e.Type).HasValue())
;
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
add a comment |
It's possible, although not so intuitive (IMHO, for EF designers it might seem logical and obvious).
You need to use Map fluent API and repeat Requires(e => e.Type).HasValue() for all derived types (and also the base type if it is not abstract).
For the sample model from the post it should be:
modelBuilder.Entity<TypeOf>()
.Map(m => m.Requires(e => e.Type).HasValue())
.Map<Country>(m => m.Requires(e => e.Type).HasValue())
.Map<ProductionLine>(m => m.Requires(e => e.Type).HasValue())
.Map<SubCode>(m => m.Requires(e => e.Type).HasValue())
.Map<HsCode>(m => m.Requires(e => e.Type).HasValue())
;
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
add a comment |
It's possible, although not so intuitive (IMHO, for EF designers it might seem logical and obvious).
You need to use Map fluent API and repeat Requires(e => e.Type).HasValue() for all derived types (and also the base type if it is not abstract).
For the sample model from the post it should be:
modelBuilder.Entity<TypeOf>()
.Map(m => m.Requires(e => e.Type).HasValue())
.Map<Country>(m => m.Requires(e => e.Type).HasValue())
.Map<ProductionLine>(m => m.Requires(e => e.Type).HasValue())
.Map<SubCode>(m => m.Requires(e => e.Type).HasValue())
.Map<HsCode>(m => m.Requires(e => e.Type).HasValue())
;
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
It's possible, although not so intuitive (IMHO, for EF designers it might seem logical and obvious).
You need to use Map fluent API and repeat Requires(e => e.Type).HasValue() for all derived types (and also the base type if it is not abstract).
For the sample model from the post it should be:
modelBuilder.Entity<TypeOf>()
.Map(m => m.Requires(e => e.Type).HasValue())
.Map<Country>(m => m.Requires(e => e.Type).HasValue())
.Map<ProductionLine>(m => m.Requires(e => e.Type).HasValue())
.Map<SubCode>(m => m.Requires(e => e.Type).HasValue())
.Map<HsCode>(m => m.Requires(e => e.Type).HasValue())
;
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
answered Nov 22 '18 at 10:10
Ivan StoevIvan Stoev
107k785138
107k785138
add a comment |
add a comment |
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As bonus question I also would like to create a composite key with this discriminator + key
– Bastien Vandamme
Nov 22 '18 at 10:14