Reset Entity-Framework Migrations

Question

I ve mucked up my migrations  I used IgnoreChanges on the initial migration  but now I want to delete all my migrations and start with an initial migration with all of the logic   When I delete the migrations in the folder and try and Add-Migration it doesn t generate a full file  it s empty - because I haven t made any changes since my last  but now deleted  migration    Is there any Disable-Migrations command  so I can rerun Enable-Migrations

User · Accepted Answer

You need to     Delete the state  Delete the migrations folder in your project  And Delete the   MigrationHistory table in your database  may be under system tables   Then Run the following command in the Package Manager Console   Enable-Migrations -EnableAutomaticMigrations -Force   Use with or without -EnableAutomaticMigrations And finally  you can run   Add-Migration Initial

User · Answer

The Issue  You have mucked up your migrations and you would like to reset it without deleting your existing tables   The Problem  You can t reset migrations with existing tables in the database as EF wants to create the tables from scratch   What to do    Delete existing migrations from Migrations History table  Delete existing migrations from the Migrations Folder  Run add-migration Reset   This will create a migration in your Migration folder that includes creating the tables  but it will not run it so it will not error out     You now need to create the initial row in the MigrationHistory table so EF has a snapshot of the current state  EF will do this if you apply a migration   However  you can t apply the migration that you just made as the tables already exist in your database   So go into the Migration and comment out all the code inside the  Up  method  Now run update-database   It will apply the Migration  while not actually changing the database  and create a snapshot row in MigrationHistory    You have now reset your migrations and may continue with normal migrations

User · Answer

In Net Core 3 0   I was not able to find a way to Reset Migrations   I also ran into problems with broken migrations  and the answers provided here didn t work for me   I have a  Net Core 3 0 web API  and somewhere in the last month I edited the database directly  Yes  I did a bad  bad thing   Strategies suggested here resulted in a number of errors in Package Manager Console    A migration of that name already exists Could not find the snapshot  Force  is not a recognized parameter   Granted  I may have missed a step or missed clearing out the correct files  but I found that there are ways to clean this up without as much brute force    Remove-Migration from the PMC for each migration by name  in reverse order of creation  up to and including the broken migration Add-Migration to create a new migration which will be the delta between the last good migration up to the current schema   Now when the web API is started with an empty database  it correctly creates all the tables and properties to match the entity models   HTH

User · Answer

How about   Update-Database    TargetMigration   InitialDatabase   in Package Manager Console  It should reset all updates to its very early state   Reference link  Code First Migrations - Migrating to a Specific Version  Including Downgrade

User · Answer

In Entity Framework Core   Remove all files from migrations folder   Type in console dotnet ef database drop -f -v dotnet ef migrations add Initial dotnet ef database update    UPD  Do that only if you don t care about your current persisted data  If you do  use Greg Gum s answer

User · Answer

Considering this still shows up when we search for EF in  NET Core  I ll post my answer here  Since it has haunted me a lot   Note that there are some subtleties with the EF 6  NET version  No initial command  and you will need to delete  Snapshot  files    Tested in  NET Core 2 1   Here are the steps    Delete the   efmigrationhistory table  Search for your entire solution for files that contain Snapshot in their name  such as ApplicationDbContextSnapshot cs  and delete them  Rebuild your solution Run Add-Migration InitialMigration   Please note  You must delete ALL the Snapshot files  I spent countless hours just deleting the database    This will generate an empty migration if you don t do it   Also  in  3 you can just name your migration however you want   Here are some additional resources  asp net CORE Migrations generated empty  Reset Entity Framework 7 migrations

User · Answer

My problem turned out to be that I manually removed the Migrations folder  I did that because I wanted to back up the contents  so I simply dragged the folder out of the project  I later fixed the problem by putting it back in  after making a backup copy   then removing the Migrations folder by right-clicking it in Solutions Explorer and choosing Delete from the popup menu

User · Answer

To fix this  You need to     Delete all   cs files in the Migrations Folder  Delete the  MigrationHistory Table in the Database     Run Enable-Migrations -EnableAutomaticMigrations -Force Run Add-Migration Reset   Then  in the public partial class Reset   DbMigration class  you need to comment all of the existing and current Tables   public override void Up        CreateTable      dbo  lt EXISTING TABLE NAME IN DATABASE gt                      If you miss this bit all will fail and you have to start again    Now Run Update-Database -verbose   This should be successful if you have done the above correctly  and now you can carry on as normal

User · Answer

In EntityFramework 6 please try   Add-Migration Initial   in order to update the initial migration file

User · Answer

In EF6   Delete all your files in  migrations  folder    But not the  initial create  or  config   Delete the database  Now run Add-Migration Initial  Now you can  update-database  and all will be well

User · Answer

UPDATE 2020   gt   Reset Entity-Framework Migrations Add-Migration Initial -Context ApplicationDbContext  ApplicationDbContext   gt  Your context  But if you need only update a identity schema existent  try it  https   stackoverflow com a 59966100 4654957

User · Answer

Enable-Migrations -EnableAutomaticMigrations -Force

User · Answer

This method doesn t require deleting of the   MigrationHistory table  so you don t have to put your hands on the database on deploy    Delete existing migrations from the Migrations folder  In Package Manager Console run Add-Migration ResetMigrations Clean migration history in the Up   method         lt summary gt      Reset existing migrations by cleaning the   MigrationHistory table     and creating a new initial migration with the current model snapshot       lt  summary gt  public partial class ResetMigrations   DbMigration       public override void Up                 Sql  DELETE FROM  dbo     MigrationHistory                public override void Down

User · Answer

Delete the Migrations Folder  Clean then Rebuild the project  This worked for me  Before Clean and Rebuild it was saying the Migration already exists since in its cached memory  it s not yet deleted

[entity-framework] Reset Entity-Framework Migrations

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