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[DOC] Updated 'Migration guide from beta.17.4 through beta.17.8 to beta.18'. Bugfix, and info about upload_file_morph.

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#### Description of what you did:



#### My PR is a:

- [ ] 💥 Breaking change
- [x] 🐛 Bug fix
- [x] 💅 Enhancement
- [ ] 🚀 New feature

#### Main update on the:

- [ ] Admin
- [x] Documentation
- [ ] Framework
- [ ] Plugin

#### Manual testing done on the following databases:

- [x] Not applicable
- [ ] MongoDB
- [ ] MySQL
- [ ] Postgres
- [ ] SQLite
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Marcin Panniak 2019-12-20 00:11:31 +01:00 committed by GitHub
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docs/3.0.0-beta.x/migration-guide/migration-guide-beta.17-to-beta.18.md
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@ -380,10 +380,19 @@ _Repeat this query for every join table where you are using this component._
```sql
UPDATE restaurant_components
SET component_type = 'groups_old_table_name'
WHERE component_type = 'components_new_table_name';
SET component_type = 'components_new_table_name'
WHERE component_type = 'groups_old_table_name';
```
**4. If you store files in groups, update the `related_type` values**
```sql
UPDATE upload_file_morph
SET related_type = 'components_new_table_name'
WHERE related_type = 'groups_old_table_name';
```
#### Mongo
In `mongo` the relation between a content type and its components is held in an array of references. To know which component type it referes to, the array also contains a `kind` attribute containing the component Schema name.