Entitfy Framework: everything is broken when I change schema -

Entitfy Framework: everything is broken when I change schema -

i utilize ef code-first approach.

i have class:

public class cat { // ... }

then add together properties , migrations them. have couple of existing migrations. create abstract class:

public abstract class animal { // ... }

and inherit cat animal:

public cat : animal { // ... }

when that, , run add-migration run problem can't solve. ef gives me error:

unable generate explicit migration because next explicit migrations pending: [...]. apply pending explicit migrations before attempting generate new explicit migration.

this because schema stored in __migrationhistory. , when ef tries compare current schema schema fetched database (from __migrationhistory), fails.

everything's fine when drop of migrations , create database scratch.

but don't want drop entire database when schema changes.

how can handle schema changes ef?

here similar post, without solution.

if ran add-migration , didn't run update-database run it.

but times run next command:

pm>add-migration migration1

then create changes model, in case if want add together migration, mentioned error, have 2 options:

run update-database apply pending changes of migration1 database , add together new migration. run add-migration migration1 -force add together pending migrations migration1 , run update-database.

entity-framework