Added fix for multi composite key to V5 branch

[cskiwi]

Pull Request check-list

Please make sure to review and check all of these items:

• Does npm run test or npm run test-DIALECT pass with this change (including linting)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• Have you added new tests to prevent regressions?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Did you update the typescript typings accordingly (if applicable)?
• Did you follow the commit message conventions explained in CONTRIBUTING.md?

Description of change

Added the fix from #11984 to the v5 branch.
This is needed for people using 'sequelize-typescript' because that doesn't work on v6 yet

[hsource]

It looks like sequelize-typescript will support v6 (see sequelize/sequelize-typescript#807), including v6.2+ hopefully soon!

[papb]

Hello @cskiwi! I see you are a first-time contributor, thank you for taking the time to help Sequelize! I hope to see more PRs from you in the future!

Sorry to take long to reply. I shall be replying faster now.

Some tests are failing, can you fix them?

[cskiwi]

hi @papb I would really love to run the tests, but I get following error:

> cross-env DIALECT=postgres npm run test-integration


> sequelize@0.0.0-development test-integration D:\Programming\Code\cskiwi\sequelize
> mocha --require scripts/mocha-bootload --globals setImmediate,clearImmediate --exit --check-leaks --colors -t 30000 --reporter spec "test/integration/**/*.test.js"

FIXME: I want to be supported in this dialect as well :-(


  [POSTGRES] Alias
    1) "before each" hook for "should uppercase the first letter in alias getter, but not in eager loading"


  0 passing (30s)
  1 failing

  1) "before each" hook for "should uppercase the first letter in alias getter, but not in eager loading":
     Error: Timeout of 30000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.
      at listOnTimeout (internal/timers.js:551:17)
      at processTimers (internal/timers.js:494:7)



npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sequelize@0.0.0-development test-integration: `mocha --require scripts/mocha-bootload --globals setImmediate,clearImmediate --exit --check-leaks --colors -t 30000 --reporter spec "test/integration/**/*.test.js"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sequelize@0.0.0-development test-integration script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\glenn\AppData\Roaming\npm-cache\_logs\2021-01-20T08_30_11_756Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sequelize@0.0.0-development test-integration-postgres: `cross-env DIALECT=postgres npm run test-integration`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sequelize@0.0.0-development test-integration-postgres script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\glenn\AppData\Roaming\npm-cache\_logs\2021-01-20T08_30_11_804Z-debug.log

Any suggestions?