Skip to content

Latest commit

 

History

History
70 lines (46 loc) · 3.1 KB

ARCHITECTURE.md

File metadata and controls

70 lines (46 loc) · 3.1 KB
Raw

Graphs

To Generate/Update install GraphViz

ts-node scripts/graph-dependencies.ts

Dependencies

Dev Dependencies

Peer Dependencies

Generators

See Prisma Generators

The DMMF, or Data Model Meta Format

What the ... is DMMF? It's the Datamodel Meta Format. It is an AST (abstract syntax tree) of the datamodel in the form of JSON.
The whole Prisma Client is just generated based on the DMMF, which comes from the Rust engines. Note: the datamodel is contained in the Prisma schema file, along the datasource and generators blocks.

⚠️ Note: The DMMF is a Prisma ORM internal API with no guarantees for stability to outside users. We might - and do - change the DMMF in potentially breaking ways between minor versions. 🐲

Upgrading and debugging

Oftentimes, the Rust team did a change in DMMF, which you now need to integrate. How to do that?
The first step is to identify, which new @prisma/engines version you want to use.
Either have a look in the Versions tab in https://www.npmjs.com/package/@prisma/engines or check out npm info @prisma/engines in your terminal.
Let's say you determined, that you want to upgrade to 2.20.0-14.f461292a2242db52d9f4c87995f0237aacd300d2. To upgrade your local workspace, run this command to upgrade both @prisma/engines and @prisma/engines-version:

pnpm update -r @prisma/engines@2.20.0-14.f461292a2242db52d9f4c87995f0237aacd300d2 @prisma/engines-version@2.20.0-14.f461292a2242db52d9f4c87995f0237aacd300d2

In the ./packages/client dir, now open sandbox/dmmf.ts in your VSCode editor. Either run ndb in your terminal to debug the file: ndb -r ts-node/register ./sandbox/dmmf.ts Or

  1. Open .vscode/launch.json.default and save it as .vscode/launch.json.
  2. Then click on the debug icon in VSCode:image
  3. Then select in the dropdown of possible runner options Client - Current TS File image
  4. Then just press the green play button
  5. You should now be able to go through the DMMF and have a look at the json structure image

You can always check out the test of our "exhaustive schema", where we test the fully generated client, which depends on the dmmf:

pnpm run test exhaustive

Usually, dmmf changes are also visible in the tests of the @prisma/internals package:

cd ./packages/internal
pnpm run test

If there is a change in the snapshots, only accept them if you're 100% certain, that these changes are expected.
If not, please always ping the Rust team, if this is an intended change.