I'm building a web API using Asp.Net core 3.0 with EFcore. I'm using code first approach. I did my initial migration with this model
public class Group {
[Key]
public int Id{get;set;}
public string Title { get; set; }
}
Later I added a foreign key relationship to this model
public class Group {
[Key]
public int Id{get;set;}
public string Title { get; set; }
[ForeignKey("UserId")]
public User User { get; set; }
public int UserId { get; set; }
}
The new migrations generates properly when I run Add-Migration <migrationName>
on PMC
. But when I run update-database
I get this error: SQLite does not support this migration operation ('DropForeignKeyOperation')
This is a documented limitation of the SQLite Database Provider:
Workaround (Source: MSDN )
You can workaround some of these limitations by manually writing code in your migrations to perform a table rebuild. A table rebuild involves renaming the existing table, creating a new table, copying data to the new table, and dropping the old table. You will need to use the Sql(string) method to perform some of these steps.
Edit : As directed by @Shawn it seems MSDN is out of date and this is a malpractice. Instead use the Sql(string)
method to issue an ALTER TABLE
statement as documented here .
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