Fixes https://github.com/payloadcms/payload/issues/13433. Testing
release: `3.54.0-internal.90cf7d5`
Previously, when calling `getPayload`, you would always use the same,
cached payload instance within a single process, regardless of the
arguments passed to the `getPayload` function. This resulted in the
following issues - both are fixed by this PR:
- If, in your frontend you're calling `getPayload` without `cron: true`,
and you're hosting the Payload Admin Panel in the same process, crons
will not be enabled even if you visit the admin panel which calls
`getPayload` with `cron: true`. This will break jobs autorun depending
on which page you visit first - admin panel or frontend
- Within the same process, you are unable to use `getPayload` twice for
different instances of payload with different Payload Configs.
On postgres, you can get around this by manually calling new
`BasePayload()` which skips the cache. This did not work on mongoose
though, as mongoose was caching the models on a global singleton (this
PR addresses this).
In order to bust the cache for different Payload Config, this PR
introduces a new, optional `key` property to `getPayload`.
## Mongoose - disable using global singleton
This PR refactors the Payload Mongoose adapter to stop relying on the
global mongoose singleton. Instead, each adapter instance now creates
and manages its own scoped Connection object.
### Motivation
Previously, calling `getPayload()` more than once in the same process
would throw `Cannot overwrite model` errors because models were compiled
into the global singleton. This prevented running multiple Payload
instances side-by-side, even when pointing at different databases.
### Changes
- Replace usage of `mongoose.connect()` / `mongoose.model()` with
instance-scoped `createConnection()` and `connection.model()`.
- Ensure models, globals, and versions are compiled per connection, not
globally.
- Added proper `close()` handling on `this.connection` instead of
`mongoose.disconnect()`.
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