How to add a default taxonomy term to all nodes in a migration?

For a Drupal 7 to Drupal 8 migration, we’re taking what was a Quotation content type and migrating it into an Article content type, joining a ton of nodes that are staying as Articles. To distinguish, I want to add a taxonomy term “Quotation” to the field_categories (which exists on Articles D7 and D8 but not on Quotation).

So i’m “simply” trying to add a value not from a source, but hard-coded. My source plugin is d7_node (namespace DrupalnodePluginmigratesourced7).

I’m flailing a bit; tried entity_generate but couldn’t figure out how to tell it to use a constant and/or default value rather than looking for something from source.

Even this didn’t work, when i tried to test the simplest thing i could think of when already knowing the term ID of an existing term:

  field_categories:     plugin: iterator     source: field_categories     process:       target_id:         -           plugin: default_value           default_value: 10838 

Can one use the default_value plugin or something like it for the ‘source:’?

I’m about to stick my non-source value into what comes from the source with a prepare row hook, but it seems there ought to be an easier way.

Note that in this case there is nothing from field_categories in the source to worry about, but i’m also interested in the case of adding a new, hard-coded-into-the-migration term into a field that will have content, in my case field_tags.

This article was republished from its original source.
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How to add a default taxonomy term to all nodes in a migration?

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