Strapi Fragment API?

Discord Q&A strapi-questions
1

I’m migrating a site to Strapi v5. Some of my queries are not working, because they use deep populate statements.

{
  "message": "Invalid nested population query detected. When using 'populate' within polymorphic structures, its value must be '*' to indicate all second level links. Specific field targeting is not supported here. Consider using the fragment API for more granular population control."
}

Okay, I would love to get started with the Fragment API. Looking over the docs, using google, and searching this Discord, I see no references to any Fragment API. What is it, and how can I start using it?

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2

I should add that I’m definitely using populate statements inside of polymorphic structures in my v4 code. I need to do this in v5 (or accomplish the same result).