How To Write Dynamic Migrations - Mohit Aghera

May 15, 20180 likes110 views

This document discusses how to write dynamic migrations in Drupal 8 using migration templates and derivers. Derivers allow migrations to be generated dynamically based on configurable inputs. They work by extending the DeriverBase class and implementing the getDerivativeDefinitions() method to define how derivative migrations are generated. Migration templates provide a flexible way to create migrations and derivers can be specified in the template file to dynamically generate migrations. Examples of where this approach is used include migrating sites with different languages/attributes and migrating content between Drupal versions.

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How to write dynamic migration
Mohit Aghera, Mitesh Patel

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About Us
Mohit Aghera
- Back-end developer @Axelerant
- Drupal.org: mohit_aghera
- Twitter: @mohit_rocks
Mitesh Patel
- Back-end developer @Axelerant
- Known as @miteshmap over internet.

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Dynamic Migrations
● What are dynamic migrations ?
● Why do we need ?

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Migrations: A brief introduction
What Migrate API Provides:
● Migrate Data from source to destination
● Keeps track of record of migrated data
● Provides framework for writing migrations

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Migration Plugins
● Source Plugins
● Process Plugins
● Destination Plugins

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Understanding Derivatives
● Drupal 7 has “_info()” hooks
● Wonder how do we generate multiple blocks with single block plugin ?
● Drupal 8 has “Derivatives”
● Allows to generate instances dynamically

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How Derivatives works ?
● Plugin manager uses “Discovery” mechanism
● “DerivativeDiscoveryDecorator” decorator class

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Define along with Plugin

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Deriver Implementation
SystemMenuBlock Deriver implementation:

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Understanding Derivers
Notable Examples:
● SystemMenuBlock
● BlockContentBlock
● LanguageBlock
And many more..

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Possible approaches for migration
● Migration templates
● Config Entities

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Migration as Configuration entities
● Similar to any configurations
● Resides in [module]/config directory
● Typically names are given like “migrate.migration.node_page.yml”

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Migration as Configuration entities
Advantages:
● Easy to write and run
● No need to write specific logic to run unlike migration templates
Disadvantages:
● Not much flexible
● Hard to change runtime
● Dynamic migration generation is not possible
● Can’t generate based on user inputs

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Migration as templates
● Resides in [module]/migration_templates directory
● Names could match the migration id
● Typically names are given like “node_page.yml”

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Migration as templates
Advantages:
● Much more flexible than configuration entities for each variation
● Easy to change runtime
● Ability to generate dynamic migration using reusable templates

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Derivers for
Migration
● Works as a derivative for
new migrations
● Helps to create migrations
dynamically
● Extends DeriverBase class.

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Writing
Derivers
● Implement
getDerivativeDefinitions()
and write your logic.

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Using Derivers
Specify in migration template file.

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Use cases
● Migrating large amount of sites with similar architecture
but different languages in each site (our use case,
https://github.com/miteshmap/drupal_migration_demo)
● Core: Migrating D7 to D8
● Core: Migrating Workbench Moderation to Content
Moderation (https://www.drupal.org/project/wbm2cm)
● Migrating sites from Magento for instance with different
attributes for each site
● And many more...

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Thank you … for being here and allowing
us to contribute and share our knowledge
To summarise…
● We discussed how to make migrations more dynamic and
less painful
● We saw an example of how to write derivers
● We saw advantages of doing it, it is done in Core and many
contrib modules already

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References
Migration API : https://www.drupal.org/docs/8/api/migrate-api/migrate-api-overview
Reference module : https://github.com/mohit-rocks/drupalcamp-goa

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1. 1axelerant.com How to write dynamic migration Mohit Aghera, Mitesh Patel

2. 2axelerant.com About Us Mohit Aghera - Back-end developer @Axelerant - Drupal.org: mohit_aghera - Twitter: @mohit_rocks Mitesh Patel - Back-end developer @Axelerant - Known as @miteshmap over internet.

3. 3axelerant.com Dynamic Migrations ● What are dynamic migrations ? ● Why do we need ?

4. 4axelerant.com Migrations : Recap

5. 5axelerant.com Migrations: A brief introduction What Migrate API Provides: ● Migrate Data from source to destination ● Keeps track of record of migrated data ● Provides framework for writing migrations

6. 6axelerant.com Migration Plugins ● Source Plugins ● Process Plugins ● Destination Plugins

7. 7axelerant.com Migration Flow

8. 8axelerant.com Understanding Derivatives ● Drupal 7 has “_info()” hooks ● Wonder how do we generate multiple blocks with single block plugin ? ● Drupal 8 has “Derivatives” ● Allows to generate instances dynamically

9. 9axelerant.com How Derivatives works ? ● Plugin manager uses “Discovery” mechanism ● “DerivativeDiscoveryDecorator” decorator class

10. 10axelerant.com Define along with Plugin

11. 11axelerant.com Deriver Implementation SystemMenuBlock Deriver implementation:

12. 12axelerant.com Understanding Derivers Notable Examples: ● SystemMenuBlock ● BlockContentBlock ● LanguageBlock And many more..

13. 13axelerant.com Possible approaches for migration ● Migration templates ● Config Entities

14. 14axelerant.com Migration as Configuration entities ● Similar to any configurations ● Resides in [module]/config directory ● Typically names are given like “migrate.migration.node_page.yml”

15. 15axelerant.com Migration as Configuration entities Advantages: ● Easy to write and run ● No need to write specific logic to run unlike migration templates Disadvantages: ● Not much flexible ● Hard to change runtime ● Dynamic migration generation is not possible ● Can’t generate based on user inputs

16. 16axelerant.com Migration as templates ● Resides in [module]/migration_templates directory ● Names could match the migration id ● Typically names are given like “node_page.yml”

17. 17axelerant.com Migration as templates Advantages: ● Much more flexible than configuration entities for each variation ● Easy to change runtime ● Ability to generate dynamic migration using reusable templates

18. 18axelerant.com Derivers for Migration ● Works as a derivative for new migrations ● Helps to create migrations dynamically ● Extends DeriverBase class.

19. 19axelerant.com Writing Derivers ● Implement getDerivativeDefinitions() and write your logic.

20. 20axelerant.com Using Derivers Specify in migration template file.

21. 21axelerant.com Running migration

22. 22axelerant.com Use cases ● Migrating large amount of sites with similar architecture but different languages in each site (our use case, https://github.com/miteshmap/drupal_migration_demo) ● Core: Migrating D7 to D8 ● Core: Migrating Workbench Moderation to Content Moderation (https://www.drupal.org/project/wbm2cm) ● Migrating sites from Magento for instance with different attributes for each site ● And many more...

23. 23axelerant.com Thank you … for being here and allowing us to contribute and share our knowledge To summarise… ● We discussed how to make migrations more dynamic and less painful ● We saw an example of how to write derivers ● We saw advantages of doing it, it is done in Core and many contrib modules already

24. 24axelerant.com References Migration API : https://www.drupal.org/docs/8/api/migrate-api/migrate-api-overview Reference module : https://github.com/mohit-rocks/drupalcamp-goa

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