Fix: EF Core Pending Model Changes Error - Dev Fix in 30 Seconds

The Error

Microsoft.EntityFrameworkCore.Migrations: The model has pending changes. Add a new migration.

Quick Fix - 1 Minute

// Dev Fix: Generate and apply migration
// Package Manager Console:
Add-Migration FixPendingModelChanges
Update-Database
// Or CLI:
dotnet ef migrations add FixPendingModelChanges
dotnet ef database update

Why This Happens

EF Core detects your DbContext model doesn't match the last migration snapshot. Common after adding DbSet, changing properties, or switching branches. .NET 8 EF throws on startup if db.Database.Migrate() is called with pending changes.

Step-by-Step Debug

1. Check what changed: dotnet ef migrations list
2. If changes are wrong: delete last migration folder + Remove-Migration
3. If changes are correct: Add-Migration YourChangeName
4. Never edit migration files after Update-Database - creates drift
5. For CI/CD: use db.Database.Migrate() only after verifying migrations exist

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