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Here are the steps to use JetBrains Rider on OpenSuse Tumbleweed for implementing a Database-first approach in ASP.NET Core MVC:

1. Install the dotnet-sdk: To begin, you will need to install the .NET SDK on your OpenSuse Tumbleweed. Follow the instructions from the official .NET Core website to install the SDK.

2. Install JetBrains Rider: Download and install JetBrains Rider from their official website.

3. Create a new ASP.NET Core project: Open JetBrains Rider and create a new ASP.NET Core Web Application project.

4. Install the required NuGet packages: Open the NuGet Package Manager Console in Rider and install the following packages:

   • Microsoft.EntityFrameworkCore.SqlServer
   • Microsoft.EntityFrameworkCore.Design

5. Scaffold the database context and entities: In the Package Manager Console, you can now scaffold your database context and entity classes using the following command:

   Scaffold-DbContext "Server=<server-name>;Database=<database-name>;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
   

   This command creates a DbContext and entity classes based on your database schema.

6. Add the DbContext to the application: In the Startup.cs file of your ASP.NET Core project, add the following code to the ConfigureServices method:

   services.AddDbContext<YourDbContext>(options =>
     options.UseSqlServer(Configuration.GetConnectionString("YourConnectionString")));
   

   Ensure that you replace YourDbContext with the name of your DbContext class, and YourConnectionString with the connection string to your database.

7. Use your entities in your controllers and views: With your entities and DbContext set up, you can now use them in your controllers and views to interact with your database.

That's it! With these steps, you can use JetBrains Rider on OpenSuse Tumbleweed to implement a database-first approach in ASP.NET Core MVC.