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Using EF6 Code First without migrations to an existing db how do I specify column names of the many to many join table?


Using EF6 Code First without migrations to an existing db how do I specify column names of the many to many join table?

By : Igor Kireev
Date : November 20 2020, 03:01 PM
will help you I would go with the fluent and you can mention the keys as below. for better understanding, bellow is an example of Student and Courses
code :
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{

    modelBuilder.Entity<Student>()
                .HasMany<Course>(s => s.Courses)
                .WithMany(c => c.Students)
                .Map(cs =>
                        {
                            cs.MapLeftKey("StudentId");
                            cs.MapRightKey("CourseId");
                            cs.ToTable("StudentCourse"); // this is mappingtable
                        });

}


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Code First Migrations With Existing Table

Code First Migrations With Existing Table


By : Fariz sasongko
Date : March 29 2020, 07:55 AM
hope this fix your issue -IGNORECHANGES
Scaffolds an empty migration ignoring any pending changes detected in the current model. This can be used to create an initial, empty migration to enable Migrations for an existing database. N.B. Doing this assumes that the target database schema is compatible with the current model.
EF5 Code First Migrations: "Column names in each table must be unique" error after using RenameColumn

EF5 Code First Migrations: "Column names in each table must be unique" error after using RenameColumn


By : Deepak
Date : March 29 2020, 07:55 AM
hope this fix your issue We're using Entity Framework 5.0 Code First and Automatic Migrations. , The workaround, obviously, is this:
code :
update-database -f -script
public void Up()
{
    Sql("...That SQL you extracted from the script...");
}
EF5 Code First Automatic Migrations: Renaming Primary Key gives error: column names in each table must be unique

EF5 Code First Automatic Migrations: Renaming Primary Key gives error: column names in each table must be unique


By : Wedge3D
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You are using Add-Migrations right? then, you need not update on the database side manually using manual scripts. You should do it in the Add-Migration scripts alone. If you manually run the scripts for rename column in the database side then Existing system generated MigrationScripts and the Database will be in out of sync. So, You will end up with an error while running/rollback the new/old migration scripts. As per my understanding, please try out the following steps
Step 1: Rename the Primary key of the Model Class (RelId to RelationId) in Visual Studio Code.
code :
namespace MyProject.Model.Migrations
{
   using System;
   using System.Data.Entity.Migrations;

   public partial class RenameMyColumn : DbMigration
   {
     public override void Up()
     {
        // Remove the following auto-generated lines(Note:These scripts generated for an example purpose not for primary key)
        AddColumn("dbo.MyTable", "NewColumn", c => c.String(nullable: false, maxLength: 50));
        DropColumn("dbo.MyTable", "OldColumn");

        // Add this line
        RenameColumn("dbo.MyTable", "OldColumn", "NewColumn");
    }

    public override void Down()
    {
        // Remove the following auto-generated lines(Note:These scripts generated for an example purpose not for primary key)
        AddColumn("dbo.MyTable", "OldColumn", c => c.String(nullable: false, maxLength: 50));
        DropColumn("dbo.MyTable", "NewColumn");

        // Add this line
        RenameColumn("dbo.MyTable", "NewColumn", "OldColumn");
    }
  }
}
How to add new column to existing table and set it value based on existing column using EF migrations

How to add new column to existing table and set it value based on existing column using EF migrations


By : Benjamín
Date : March 29 2020, 07:55 AM
To fix this issue No really good way to do that. You need to edit the generated migration manually as follows:
Modify the AddColumn command to create the column initially with nullable set to true (i.e. optional). Populate the column using the Sql method and raw SQL commands. Add AlterColumn command to change the column nullable to the intended false (i.e. required).
code :
protected override void Up(MigrationBuilder migrationBuilder)
{
    migrationBuilder.AddColumn<string>(
        name: "Manufacturer",
        table: "Cars",
        nullable: true);

    migrationBuilder.Sql(
@"UPDATE Cars SET Manufacturer = CASE CarModel
  WHEN 'Passat' THEN 'VW'
  WHEN 'Land Cruiser' THEN 'Toyota'
  ELSE 'Other' END");

    migrationBuilder.AlterColumn<string>(
        name: "Manufacturer",
        table: "Cars",
        nullable: false,
        oldClrType: typeof(string),
        oldNullable: true);
}
how to alter an existing table column in laravel 5.3 using migrations

how to alter an existing table column in laravel 5.3 using migrations


By : Leslie Lobo
Date : March 29 2020, 07:55 AM
hope this fix your issue You can use change() method to do this:
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