C#•3y ago

✅ Updating Migrations

From my understanding Migrations are the code for EF to create a SQL DB. Ive followed this crash course https://www.youtube.com/watch?v=BfEjDD8mWYg&t=2848s to create my first one but I added more properties to the model so wondering how to update the migration to include those properties on the table. Any help would uh help haha.

Does anyone have any tutorials or info on migrations and how to work with them?

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ASP.NET Core Crash Course - C# App in One Hour

Learn how to create a web database app in ASP.NET Core using Visual Studio and the C# language.

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Anu6is•12/20/23, 12:20 AM

just like you added the initial migration, you do the same for every new migration

EricAwesomenessOP•12/20/23, 12:21 AM

So do i delete the initial migration then?

EricAwesomenessOP•12/20/23, 12:21 AM

Also whats the naming convention for the others does it matter?

Anu6is•12/20/23, 12:22 AM

no, don't delete it, they are compounded to give the final state

Anu6is•12/20/23, 12:23 AM

naming doesn't matter, just make it unique

mg•12/20/23, 12:23 AM

Your understanding isn't quite correct

mg•12/20/23, 12:23 AM

Migrations are how EF makes changes to the database to make it reflect your DbContext

mg•12/20/23, 12:24 AM

The initial migration will indeed be creating everything, but that's just the initial one

mg•12/20/23, 12:24 AM

A migration could also do something like change the type of a column or create or drop a table

EricAwesomenessOP•12/20/23, 12:25 AM

Ah okay so as I make changes to my DbContext do i just create a new migration and end up with like 40 of them in the folder lol?

EricAwesomenessOP•12/20/23, 12:25 AM

Well I wouldnt make changes to the DbContext just to the Models rights?

mg•12/20/23, 12:25 AM

That's one option. You can also re-create the first migration every time, which is what I do until I need to start caring about the data in the database

mg•12/20/23, 12:26 AM

Yeah, when I say context I mean the DbContext itself and any model that's stored in your database

EricAwesomenessOP•12/20/23, 12:27 AM

That seems like what I would like to do more at least until I stop changing it as much. Whats the command for that or is there a place I can find it?

mg•12/20/23, 12:27 AM

dotnet ef database update 0dotnet ef database update 0 to revert the database, dotnet ef migrations removedotnet ef migrations remove to remove the migration, and then dotnet ef migrations add InitialCreatedotnet ef migrations add InitialCreate to create it again

mg•12/20/23, 12:27 AM

And dotnet ef database updatedotnet ef database update after you've created the new one

EricAwesomenessOP•12/20/23, 12:28 AM

Sweet thanks a ton mg I appreciate the help king

mg•12/20/23, 12:28 AM

ofc

mg•12/20/23, 12:28 AM

I just ended up batching it all up into a script

mg•12/20/23, 12:29 AM

Then you can do a dotnet builddotnet build beforehand and pass --no-build--no-build to all the EF calls so it doesn't rebuild your project every time

✅ Updating Migrations

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