This question already has answers here:
How to unapply a migration in ASP.NET Core with EF Core
(19 answers)
Closed 2 years ago.
I am trying to target a previous applied migration using dotnet ef -TargetMigration: {MigrationName}
getting below error
Unrecognized option '-TargetMigration:0'
Is this command has been removed in Entity Framework Core? Is there any alternative for this?
You can use as shown below on the package manager console :
PM > Update-Database [[-Migration] <String>]
Parameter :
-Migration <String>
Specifies the target migration.
If '0', all migrations will be reverted.
If omitted, all pending migrations will be applied.
https://docs.efproject.net/en/latest/miscellaneous/cli/dotnet.html
Remember its totally different from what you expect...
dotnet ef migrations list
dotnet ef migrations [arg] {option}
dotnet ef migrations add [name]
" " " remove //removes last
as per the instructions manually removing the changes from the database if it has been applied already. e.g dotnet ef database update.
Related
after I execute the add-migration in the PMC the migration class is created with all the correct changes need in the Up method.
When I run the update-database command in the PMC I get the error
System.InvalidOperationException: The migration '***MigrationName***' was not found.
I have never seen this before and the file it says is not there clearly exist.
If I execute the remove-migrations command the newly created migration class is not removed, I get an error stating that the previous migration has already been applied.
It appears that all new migrations created with add-migrations are not recognized via the update-database or remove-migration commands
One of the reasons for this is that dbcontext is not in startup project and it is inside another project. In this case PM may not be able to find routes to complete migrations. We can use dotnet with explicit dbcontext and proj name where dbcontext is:
dotnet ef database update --context YourAppContext --project YourProj
We just had the same issue. The problem was that, we excluded the Migrations folder from the solution in Visual Studio.
Project ⇒ Show all files
Right Click on "Migrations"
» Include in project
The above steps resolved it for us.
I know this is that type of question that was asked before but I couldn't find a valid answer to it.
So, is there a possibility to change where migrations are stored? I'm using EF Core.
FYI: I know that if you move the first generated migration, the upcoming ones will be placed in the same location.
For core EF projects, you can specify the output directory with the '-o' or '--output-dir' option after Add-Migration.
Example:
Add-Migration -o Data\Migrations
If using the dotnet core CLI command, you can specify the same option:
dotnet ef migrations add -o Data\Migrations
Sources and more info:
https://docs.efproject.net/en/latest/miscellaneous/cli/powershell.html
https://docs.efproject.net/en/latest/miscellaneous/cli/dotnet.html
In my project I have dozen+ migrations. http://screencast.com/t/CA2kZk3WCFj
But when I try to create database from scratch EF only starts from the marked migration to the bottom.
if I enter command:
update-database -targetMigration InitialCreate
this is the response:
he specified target migration 'InitialCreate' does not exist. Ensure that target migration refers to an existing migration id.
How can I resolve this issue and make EF see all of the migrations?
This can often happen if you use the Update-Database command in Release mode. Running in Debug mode seems to work ok.
I had the same problem.
In my case, the "ignored" migrations were not in the same namespace (caused by a project renamed).
Using Entity Framework 5 code first, I'm wondering how EF Migrations decides that the target database is at a certain migration version? That is, I've emptied my database (deleted all tables) and am trying to re-do the initial migration via the following command (in the PM console): update-database -targetmigration 201212011907118_Initial. update-database then responds with 'Target database is already at version 201212011907118_Initial'.
Apparently, Code First Migrations maintains a table called 'dbo.__MigrationHistory' in which it stores metadata about applied migrations. This is a system table, which makes it difficult to e.g. delete. See this post for reference.
For some reason, my migrations appear to have been jumbled/corrupted/whatever. I'm at the point where I just want to start over, so is there a way to completely undo all migrations, erase the history, and delete the migration code, so I'm back to square one?
e.g.) PM> Disable-Migrations or Rollback-Migrations
I don't want to "update" to an original migration step (i.e. something like an InitialSchema target) because I can't find it anymore.
You can rollback to any migration by using:
Update-Database -TargetMigration:"MigrationName"
If you want to rollback all migrations you can use:
Update-Database -TargetMigration:0
or equivalent:
Update-Database -TargetMigration:$InitialDatabase
In some cases you can also delete database and all migration classes.
For Entity Framework Core:
Update-Database -Migration:0
Remove-Migration
To be clear, if using LocalDb, when you want to start from scratch just delete the database via the Database Explorer and then type enable-migrations -force in the Package Manager Console. Do not delete the database via the App_Data folder or you will have the following issue.
Update-Database -Migration 0
Remove-Migration
The documentation is here: https://learn.microsoft.com/en-us/ef/core/miscellaneous/cli/powershell#update-database
and here: https://learn.microsoft.com/en-us/ef/core/miscellaneous/cli/powershell#remove-migration
It is written wrong in their documentation i guess , for me i used
Update-Database -Target MigrationName