73 lines
1.8 KiB
Markdown
73 lines
1.8 KiB
Markdown
# MongoDB Setup
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**⚠️ WARNING: MongoDB is NOT supported in Prisma ORM v7.**
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Support for MongoDB is planned for a future v7 release. If you need MongoDB, you must use **Prisma ORM v6**.
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## Prerequisites
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- MongoDB 4.2+
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- Replica Set configured (required for transactions)
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- **Prisma ORM v6.x**
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## 1. Schema Configuration (v6)
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In `prisma/schema.prisma`:
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```prisma
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datasource db {
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provider = "mongodb"
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url = env("DATABASE_URL")
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}
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generator client {
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provider = "prisma-client-js"
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}
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```
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### ID Field Requirement
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MongoDB models **must** have a mapped `_id` field using `@id` and `@map("_id")`, usually of type `String` with `auto()` and `db.ObjectId`.
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```prisma
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model User {
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id String @id @default(auto()) @map("_id") @db.ObjectId
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email String @unique
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name String?
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}
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```
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### Relations
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Relations in MongoDB expect IDs to be `db.ObjectId` type.
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```prisma
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model Post {
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id String @id @default(auto()) @map("_id") @db.ObjectId
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author User @relation(fields: [authorId], references: [id])
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authorId String @db.ObjectId
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}
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```
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## 2. Environment Variable
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In `.env`:
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```env
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DATABASE_URL="mongodb+srv://user:password@cluster.mongodb.net/mydb?retryWrites=true&w=majority"
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```
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## Migrations vs Introspection
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- **No Migrations**: MongoDB is schema-less. `prisma migrate` commands **do not work**.
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- **db push**: Use `prisma db push` to sync indexes and constraints.
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- **db pull**: Use `prisma db pull` to generate schema from existing data (sampling).
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## Common Issues
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### "Transactions not supported"
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Ensure your MongoDB instance is a **Replica Set**. Standalone instances do not support transactions. Atlas clusters are replica sets by default.
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### "Invalid ObjectID"
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Ensure fields referencing IDs are decorated with `@db.ObjectId` if the target is an ObjectID.
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