Add migration guide to alpha.20

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Jim LAURIE 2019-01-22 14:31:19 +01:00
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- [Migration guide from alpha.16 to alpha.17](migration-guide-alpha.16-to-alpha.17.md)
- [Migration guide from alpha.17 to alpha.18](migration-guide-alpha.17-to-alpha.18.md)
- [Migration guide from alpha.18 to alpha.19](migration-guide-alpha.18-to-alpha.19.md)
- [Migration guide from alpha.19 to alpha.20](migration-guide-alpha.19-to-alpha.20.md)

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# Migration guide from alpha.19 to alpha.20
**Here are the major changes:**
- Fix email issue on user update
- Improve GraphQL performances
**Useful links:**
- Changelog: [https://github.com/strapi/strapi/releases/tag/v3.0.0-alpha.20](https://github.com/strapi/strapi/releases/tag/v3.0.0-alpha.20)
- GitHub diff: [https://github.com/strapi/strapi/compare/v3.0.0-alpha.19...v3.0.0-alpha.20](https://github.com/strapi/strapi/compare/v3.0.0-alpha.19...v3.0.0-alpha.20)
<br>
::: note
Feel free to [join us on Slack](http://slack.strapi.io) and ask questions about the migration process.
:::
<br>
## Getting started
Install Strapi `alpha.20` globally on your computer. To do so run `npm install strapi@3.0.0-alpha.20 -g`.
When it's done, generate a new empty project `strapi new myNewProject` (don't pay attention to the database configuration).
<br>
## Update node modules
Update the Strapi's dependencies version (move Strapi's dependencies to `3.0.0-alpha.20` version) of your project.
Run `npm install strapi@3.0.0-alpha.20 --save` to update your strapi version.
<br>
## Update the Admin
::: note
If you performed updates in the Admin, you will have to manually migrate your changes.
:::
Delete your old admin folder and replace it with the new one.
<br>
## Update the Plugins
::: note
If you did a custom update on one of the plugins, you will have to manually migrate your update.
:::
Copy the fields and relations you had in your `/plugins/users-permissions/models/User.settings.json` and `/plugins/users-permissions/config/jwt.json` file in the new one.
Then, delete your old `plugins` folder and replace it with the new one.
## Update services
For both bookshelf and mongoose, you will have to update all services of your generated API.
You will have to update one line of the `fetchAll` function.
**Mongoose** replace `.populate(populate);` by `.populate(filters.populate || populate);`.
**Bookshelf**: replace `withRelated: populate` by `withRelated: filters.populate || populate`.
<br>
That's all, you have now upgraded to Strapi `alpha.20`.