实体框架尝试创建重复列

Question

我正在使用实体框架。该表已存在，列为my_column。我将属性my_column添加到我的类中以访问该列。然后程序似乎尝试创建列，但由于它已经存在而失败。

Column names in each table must be unique. Column name 'my_column' in table 'my_table' is specified more than once.

有没有办法让它不尝试创建列并认识到现有的列应该使用它？

Answer 1

您可以在更新数据库之前编辑迁移。删除重复项，看看会发生什么。

            migrationBuilder.CreateTable(

            name: "InvoiceConsumers",

            columns: table => new

            {

               …,

                InvoiceId = table.Column<int>(nullable: false),

                InvoiceId1 = table.Column<int>(nullable: true)

            },

            constraints: table =>

            {

                table.PrimaryKey("PK_InvoiceConsumers", x => x.Id);

                table.ForeignKey(

                    name: "FK_InvoiceConsumers_Consumers_ConsumerId",

                    …);

                table.ForeignKey(

                    name: "FK_InvoiceConsumers_Invoices_InvoiceId",

                    …

                    onDelete: ReferentialAction.Cascade);

                table.ForeignKey(

                    …

                    column: x => x.InvoiceId1,

                    principalTable: "Invoices",

                    …

                    );

            });