docs(migrating_to_6): add note on #5124

Automattic · Jul 30, 2021 · 33bfeb6 · 33bfeb6
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 * Schema paths declared with `type: { name: String }` become single nested subdocs in Mongoose 6, as opposed to Mixed in Mongoose 5. This removes the need for the `typePojoToMixed` option. See [gh-7181](https://github.com/Automattic/mongoose/issues/7181).
 
+* Mongoose now throws an error if you `populate()` a path that isn't defined in your schema. This is only for cases when we can infer the local schema, like when you use `Query#populate()`, **not** when you call `Model.populate()` on a POJO. See [gh-5124](https://github.com/Automattic/mongoose/issues/5124).
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 * When populating a subdocument with a function `ref` or `refPath`, `this` is now the subdocument being populated, not the top-level document. See [#8469](https://github.com/Automattic/mongoose/issues/8469)
 
 * Single nested subdocs have been renamed to "subdocument paths". So `SchemaSingleNestedOptions` is now `SchemaSubdocumentOptions` and `mongoose.Schema.Types.Embedded` is now `mongoose.Schema.Types.Subdocument`. See [gh-10419](https://github.com/Automattic/mongoose/issues/10419)