iWangJiaxiang / EfCoreMany2ManyBugReproduction

Ef Core Many To Many Bug Reproduction

This repo is to reproduce the issue that EF Core's generated migration file would have unexpected field in the m2m join table when the join-table property is inside abstract class.

Instruction

1. Watch the join table file

   EfCoreMany2ManyBugReproduction/EfCoreMany2ManyBugReproduction/Entities/BookTag.cs

   Line 10 in 3ce4f3d

   public BookA BookA { get; set; }

2. Compare with generated migration file

   EfCoreMany2ManyBugReproduction/EfCoreMany2ManyBugReproduction/Migrations/20200818082707_SeeBookTagsTable.cs

   Line 54 in 3ce4f3d

   BookBId = table.Column<int>(nullable: true)

3. You will find out an additional expected field BookBId was generated, which will cause migration failure (errno: 150 "Foreign key constraint is incorrectly formed") when modify the join table