misleading message during prisma migrate dev --create-only

Bug description

when I change the column name and run npx prisma migrate dev --create-only the message shown in the console is that the data will be deleted, but its job is to only create a migration file

Environment & setup

• OS:
• Database:
• Node.js version:
• OS: Windows 10
• Database: PostgreSQL
• Node.js version: 14.16.1

Prisma Version

2.23.0

[ryands17]

@sairaj2119 👋

The message is indeed misleading as prisa migrate dev --create-only doesn’t delete data from the database.

@pantharshit00 To reproduce:

1. Create a sample schema:

model User {
  id Int @id @default(autoincrement())
  name String
}

1. Run migrate: prisma migrate dev

2. Seed some sample data

3. Update the model

model User {
  id Int @id @default(autoincrement())
  fullName String
}

1. Run prisma migrate dev --create-only. You will get a warning in the terminal that data will be lost. Press y to confirm.

2. Check the database and data still persists

The main issue here is we can change the messaging for --create-only as data is not lost when just creating the migration.

[tomhoule]

We should change the message, but the warnings are still applicable because it’s what is going to happen when you later apply the migration that was created.