Drupal 8 migration example

Drupal , migration. Dec 21, 3 Minute Read. We will be delving deeper into the nitty-gritty around the topic in this blog. Migration is the process where the content from the old site, converted into the desired format and is saved in the new site. Sometimes, migration is a simple activity of mapping the source content to the destination content types, and sometimes, it is a bit more complicated. Drupal 9 is here, and regardless of being on Drupal 7 or 8, you can start preparing to upgrade.

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Drupal 8 migration example

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Content:

• Migrating to Drupal 8
• Quick Tips for a Drupal 7 to Drupal 8 Migration
• Migrate API: custom Drupal-to-Drupal migration
• Handling Post Migration Events in Drupal 8
• An Overview for Migrating Drupal Sites to 8
• Migrating a career website to Drupal 8: a simple case study
• Introduction
• Please wait while your request is being verified...
• Using the new Drupal 8 Migration API / Module
• How to build a new source for Drupal Migrate 8

Migrating to Drupal 8

Drupal Career Online Calendar. Note: This blog post is based on Drupal 8. While the concepts will remain the same in 8. See the updated blog post here. Even if you're only casually acquainted with Drupal 8, you probably know that the core upgrade path to Drupal 8 has been completely rewritten from the ground-up, using many of the concepts of the Migrate and Drupal-to-Drupal migration modules. Using the Migrate upgrade module, it is possible to migrate much of a Drupal 6 or Drupal 7 site to Drupal 8 with a minimum of fuss DrupalEasy.

This blog post provides an example of how to migrate content from only a single, simple content type in a Drupal 6 site to a Drupal 8 site, without writing any PHP code at all. First, some background information on how the Drupal 8 Migrate module is architected. The Migrate module revolves around three main concepts:.

It is important to understand that for basic Drupal 6 to Drupal 8 migrations like this example , all of the code is already present - all the developer needs to do it to configure the migration.

It is much like preparing a meal where you already have a kitchen full of tools and food - the chef only needs to assemble what is already there. The configuration of the migration for this example will take place completely in a custom. In the end, the custom module will be quite simple - just a. The client has decided to rewrite the entire site in Drupal 8, rebuilding virtually the entire site from the ground-up - but they wanted to migrate a few thousand nodes from two particular content types.

This example will demonstrate how to write a custom migration for the simpler of the two content types. The "external article" content type to be migrated contains several fields, but only a few of consequence:.

With all of this knowledge, it's time to write our custom migration. First, create a custom module with only an. Next, create a new "migrate. This "migration template" is what all node migrations are based on when running the Drupal core upgrade path. So, it's a great place to start for our custom migration.

Note that. Each indentation must be two spaces no tab characters. To run the migration, first enable the custom module. The act of enabling the module and Drupal core's reading in of the migration configuration could trigger an error if the configuration isn't formatted properly. If the module installs properly, then Drupal Console's "migrate:debug" command can be run to confirm that the migration configuration exists.

Once the migration is complete, navigate over to your Drupal 8 site, confirm that all the content has been migrated properly, then uninstall the custom module as well as the other migrate-related modules. Thanks to Mike Ryan and Jeffrey Phillips for reviewing this post prior to publication. Files attached to nodes are migrated using the migrate upgrade UI but when I run the migration manually using a custom module the field is migrated but not populated.

Drupal 6 to Drupal 8. Setting the table First, some background information on how the Drupal 8 Migrate module is architected.

The Migrate module revolves around three main concepts: Source plugins - these are plugins that know how to get the particular data to be migrated in. Drupal's core "Migrate" module only contains base-level source plugins, often extended by other modules.

Most Drupal core modules provide their own source plugins that know how to query Drupal 6 and Drupal 7 databases for data they're responsible for. Process plugins - these are plugins designed to receive data from source plugins, then massage it into the proper form for the destination on a per-field basis. Multiple process plugins can be applied to a single piece of data. Drupal core provides various useful process plugins , but custom and contributed modules can easily implement their own.

Destination plugins - these are plugins that know how to receive data from the process plugins and create the appropriate Drupal 8 "thing".

The Drupal 8 core "Migrate" module contains general-purpose destination plugins for configuration and content entities, while individual modules can extend that support where their data requires specialized processing. The "external article" content type to be migrated contains several fields, but only a few of consequence: Title - the node's title Publication source - a single line, unformatted text field Location - a single line, unformatted text field External link - a field of type "link" Some additional notes: The "Body" field is unused, and does not need to be migrated.

Several factors make this a particularly straight-forward migration: There are no reference fields at all not even the author! All of the field types to be migrated are included with Drupal 8 core. The Drupal 6 source plugin for nodes allows a "type" parameter, which is super-handy for only migrated nodes of a certain type from the source site. Rolling up our sleeves With all of this knowledge, it's time to write our custom migration. There's a few customizations that need to be made in order to meet our requirements: Change the "id" and "label" of the migration to something unique for the project.

But, by itself, it will query the database for nodes, regardless of their type. We can remove the "nid" and "vid" field mappings in the "process" section. The Drupal core upgrade path preserves source entity ids, but as long as we're careful with reference fields in our case, we have none , we can remove the field mappings and let Drupal 8 assign new node and version ids for incoming nodes.

Note that we're not migrating previous node revisions, only the current revision. Since we don't have any "body" field data to migrate, we can remove all the "body" field mappings. Add a mapping for the "Publication source". Since it is a simple text field, we can use a direct mapping. This one is even easier than the previous because the field name is the same on both the source and destination site. Add a mapping for the source "External link" field. This process plugin knows how to take Drupal 6 link field data and massage it into the proper form for Drupal 8 link field data.

Finally, we can remove all the migration dependencies, as none of them are necessary for this simple migration. The resulting file is: Note that. Serving the meal To run the migration, first enable the custom module.

Alternatively, the "id" of a single migration may be used. Odds and ends One of the trickier aspects about writing custom migrations is updating the migration configuration on an installed module. There are several options: The Configuration development module provides a config-devel-import-one cdi1 drush command that will read a configuration file directly into the active store.

The Migrate Tools module provides Drush commands similar to the Drupal 7 Migrate module, including "migrate-status", and "migrate-rollback". Great post Michael, thanks… Great post Michael, thanks. Scratch that, I meant to… Scratch that, I meant to comment on the 8.

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Quick Tips for a Drupal 7 to Drupal 8 Migration

Drupal 7 to 9 migration has become the recent buzzword. If you are still using the Drupal 7 or 8 sites, with their extinctions already announced, a wise move is to head straight to Drupal 9 directly. Both 8 and 9 versions of Drupal have majorly transformed the way configuration and content are organized. Unlike choosing the run-of-the-mill way of updating your existing Drupal 7 website, think of migrating all your data to the brand new Drupal 9 site. An upgrade process by which data from Drupal 7 is imported to Drupal 8 or Drupal 9 is migration. This replaces the tedious copy, paste task when it comes to migration. The Drupal 7 to 9 migration process includes the configuration of user roles, vocabularies, content types, file types, image styles, and content forms like nodes, users, taxonomy terms, etc.

Migrate API: custom Drupal-to-Drupal migration

Thoughts and technical notes from the field. These are the things that go through my mind. This week I wanted to accomplish a task in Drupal 8 that would be simple in Drupal 7: Import several CSV files, each one related to the others by taxonomy terms. Most importantly, I wanted to do it with Migrate module. Migrate in Drupal 7 is a fantastic piece of code. You instantiate one of the given classes for the source material is it a CSV? Direct connection to a custom DB? Taxonomy term? Then you add one simple line of code mapping each field from source to destination. First of all, with Migrate in core, we had to greatly simplify the goals for the module.

Handling Post Migration Events in Drupal 8

Here are some reasons, why you should use migrate instead of the feeds module or any other custom importer modules:. The Migrate 8 module in core is only an API. There is no user interface. This makes it difficult for new developer to start with Migrate 8. I suggest you, to install the below listed extension modules right away before you start developing if you want to realize the full potential of migrate:.

An Overview for Migrating Drupal Sites to 8

Drupal has a very active community with tens of thousands of developers all around the world and they also have a huge focus on standard compliance and on security. We ran into this issue on updating migrated forum nodes that had since received further comments on the Drupal 6 source website. Their parent node didn't exist anymore in Drupal You can configure the entity type and its property to check for and a migration message:. What's known as plugin or addon in other platforms, is what we call a module in the Drupal universe.

Migrating a career website to Drupal 8: a simple case study

I previously wrote about handling an upgrade path for modules that don't have a Drupal 8 migration path yet. That works well when your module has a Drupal 8 entity already setup and good to go. Sometimes you just need to move info from a database table. In our case, we need to move the mapped auth data for the OneAll Social Login module. The module has two tables in the database in Drupal 7 that store authorization mappings needed to login. Failure to do so would not let users login that already had their accounts mapped. After looking through OneAll Social Login's install file, I knew that there were two tables that needed to get migrated. Note: for the sake of brevity in this blog post, we will only cover migrating the authmap table since it is the more "complicated" one to move.

Introduction

Migrate is now included in the Drupal core for making the upgrade path from 6. Drupal 8 has two new modules : Migrate: « Handles migrations » Migrate Drupal : « Contains migrations from older Drupal versions. But this module doesn't contain the configuration to migrate all you datas from your older Drupal site to Drupal 8. There is the equivalent of the D7 MigrateFieldHandler but this is not reduced to fields or to a particular field type.

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The "Migrate" module in the core is one of my favourite parts of Drupal 8 and 9. It's super flexible and makes migrating content from any source you can imagine pretty easy. Today I want to show a trick I use when I receive a csv or excel file from clients, where they want all the content migrated to Drupal. A very simple example would be a list of categories.

Using the new Drupal 8 Migration API / Module

Migrate is now included in the Drupal core for making the upgrade path from 6. Drupal 8 has two new modules : Migrate: « Handles migrations » Migrate Drupal : « Contains migrations from older Drupal versions. But this module doesn't contain the configuration to migrate all you datas from your older Drupal site to Drupal 8. There is the equivalent of the D7 MigrateFieldHandler but this is not reduced to fields or to a particular field type. Its purpose is to transform a raw value into something acceptable by your new site schema.

How to build a new source for Drupal Migrate 8

One of the university clients we are helping migrate their Drupal 7 to Drupal 8 site had an interesting dilemma. They use the Flag module to mark favorite content within their site. They also needed to push out a set of default flags as well for all users. The user would have the ability to unflag defaults they didn't need.