Hi @Nguyen, David V ,
How exactly are you using migrations? This shouldn't be the case if you have migrations enabled and no initializers that drop and recreate the database.
You should have a backup, I recommend following the steps below to re-migrate.
Step 1: Models.cs
public string status { get; set; }
Step 2: Models/ViewModels.cs
public string status { get; set; }
Step 3: Views/***.cshtml
Add status input textbox to the view.
Step 4 :
Go to Tools > NuGet Manager > Package Manager Console
PM> Enable-Migrations
PM> Add-Migration "status"
PM> Update-Database
EDIT
I am new to Entity Framework
I suggest you study the documentation, there are detailed steps in the documentation.
https://learn.microsoft.com/en-us/aspnet/mvc/overview/older-versions/hands-on-labs/aspnet-mvc-4-entity-framework-scaffolding-and-migrations#task-3--updating-the-database-using-entity-framework-migrations
the Migration folder is already in the DataAccess project/ add appropriate code to add Status column to the database
In this case, you can use Code First Migrations directly, open the Migrations\Configuration.cs file and add a new field. For specific steps, please refer to the following documents.
https://learn.microsoft.com/en-us/aspnet/mvc/overview/older-versions/getting-started-with-aspnet-mvc4/adding-a-new-field-to-the-movie-model-and-table#adding-a-rating-property-to-the-movie-model
What would Update-Database command do
Update-Database command applies migrations to the database.
From your description, you should not understand the Up() and Down() methods.
The Up() method upgrades your database from its current state (represented by your previous migrations) to the state expected by your current code migrations. The Down() method does the reverse - it removes all changes from the current migration and restores the database to the state expected by the previous migration. It's like installing/uninstalling migrations. When you call update-database, only one of these methods is executed. To use the Down method, you must explicitly specify the target migration for the upgrade. If the target migration is an older version, the migration API will automatically use the Down method and downgrade your database.
Best regards,
Lan Huang
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