How to specify custom column types in Prisma?

Question

Prisma does not currently support geospatial columns. I need to add a MySQL GEOMETRY type column to my database. I could write a custom migration, but the whole purpose of Prisma is to manage my migrations.

How to specify custom column types in Prisma schema files? Can be MySQL specific.

Answer 1

According to my latest knowledge update in September 2021, Prisma does not directly support custom column types in schemas. However, you can work around this limitation by using "Raw" SQL fields in the schema. This allows you to write custom SQL code for specific fields, effectively controlling column types that Prisma does not natively support. In your case, you want to add a MySQL GEOMETRY type column, you can define a raw SQL field in the Prisma schema. Here's an example of how you might do it: ``` model YourModel { id Int @id @default(autoincrement()) name String geom String @map("geometry_column_name") @db.VarChar(255) //Adjust the length as needed } ``` In this example, the `geom` field is defined as a `String` field, using `@map` for custom SQL mapping. The `@db.VarChar(255)` attribute is used to specify the actual column type in the database (in this case, MySQL's VARCHAR of length 255). You should replace `"geometry_column_name"` with the actual column name you want to use. Note that while this approach allows you to define custom column types and use Prisma-managed migrations, it may not provide all the benefits of Prisma's type safety and validation. Additionally, Prisma's functionality and capabilities may have changed since my last update, so I recommend checking the official Prisma documentation or the latest resources to see if there are any changes or improvements in handling custom column types