fix(core): do not set EM to entity until merging [BC] #270
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Previously all entities had internal reference to the root EM - the one created when
initializing the ORM. Now only managed entities (those merged to the EM, e.g. loaded
from the database) have this internal reference.
To use `assign()` method on new (not managed) entities, you need to provide the `em`
parameter:
```typescript
const book = new Book();
wrap(book).assign(data, { em: orm.em });
```
Closes: #267
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Previously all entities had internal reference to the root EM - the one created when
initializing the ORM. Now only managed entities (those merged to the EM, e.g. loaded
from the database) have this internal reference.
To use
assign()method on new (not managed) entities, you need to provide theemparameter:
Closes: #267