"TypeError: Cannot read property 'datasources' of undefined" after command "prisma db reset"

Using prisma client 2.13.1 the issue https://github.com/prisma/migrate/issues/653 remains.

The issue was (see link for more details) :

$ yarn blitz db reset 
yarn run v1.22.5
$ /PATH_TO_MY_APP/node_modules/.bin/blitz db reset
You are using alpha software - if you have any problems, please open an issue here:
    https://github.com/blitz-js/blitz/issues/new/choose

✔ Loading your database
✔ Are you sure you want to reset your database and erase ALL data? (y/N) · true
  tryLoadEnv Environment variables loaded from /PATH_TO_MY_APP/.env +0ms
  tryLoadEnv Environment variables loaded from /PATH_TO_MY_APP/.env +2ms
  prisma-client { clientVersion: '2.13.1' } +0ms
    TypeError: Cannot read property 'datasources' of undefined
Done in 4.54s.

My new env:

$ ./node_modules/.bin/prisma -v
Environment variables loaded from .env
@prisma/cli          : 2.13.1
@prisma/client       : 2.13.1
Current platform     : debian-openssl-1.1.x
Query Engine         : query-engine fcbc4bb2d306c86c28014f596b1e8c7980af8bd4 (at node_modules/@prisma/engines/query-engine-debian-openssl-1.1.x)
Migration Engine     : migration-engine-cli fcbc4bb2d306c86c28014f596b1e8c7980af8bd4 (at node_modules/@prisma/engines/migration-engine-debian-openssl-1.1.x)
Introspection Engine : introspection-core fcbc4bb2d306c86c28014f596b1e8c7980af8bd4 (at node_modules/@prisma/engines/introspection-engine-debian-openssl-1.1.x)
Format Binary        : prisma-fmt fcbc4bb2d306c86c28014f596b1e8c7980af8bd4 (at node_modules/@prisma/engines/prisma-fmt-debian-openssl-1.1.x)
Studio               : 0.329.0
Done in 1.94s.

$ node -v
v14.15.3

[Jolg42]

It looks like the problem is from Blitz’s implementation here https://github.com/blitz-js/blitz/blob/canary/packages/cli/src/commands/db.ts#L261-L301

It’s using some parts of Prisma that are undocumented / reserved for internal use and something is probably not working as expected.

I think this issue needs to be opened in Blitz’s repo https://github.com/blitz-js/blitz/issues/new/choose

[etiennekintzler]

Hey @Jolg42

It sounds like the datasource block is missing in the schema, it would be useful if you could share the contents of the schema.prisma file here

• The schema I used is in the link I provided (in the original issue) : https://github.com/prisma/migrate/issues/653 . The header of the schema is :

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider = "prisma-client-js"
}

the variable "DATABASE_URL" is well defined in .env.

• I try datasources instead of datasource but the result is the same.

I also try to remove the whole datasource block and the result is the same, which make me think that the problem might be that the command reset doesn’t really consider the schema.prisma file.

There is also no issues with the command migrate. Also when I remove the block datasource of the schema.prisma and run migrate it fails appropriately.

$ PATH_TO_MYAPP/node_modules/.bin/blitz db migrate
You are using alpha software - if you have any problems, please open an issue here:
    https://github.com/blitz-js/blitz/issues/new/choose

  prisma Environment variables not loaded (--schema was provided) +0ms
Error: Error: P1012

Get config 
error: Error validating: You defined no datasource. You must define exactly one datasource.
  -->  schema.prisma:1
   | 
   | 
 1 | // This is your Prisma schema file,
   | 

Validation Error Count: 1

    at Object.<anonymous> (PATH_TO_MYAPP/node_modules/@prisma/cli/build/index.js:2:1654987)
    at Generator.throw (<anonymous>)
    at rejected (PATH_TO_MYAPP/node_modules/@prisma/cli/build/index.js:2:1650422)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
Done in 1.93s.

It’s not clear why the command reset doesn’t fail in the same way when removing the datasource block.