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docs: migration guide more info (#9305)

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Dan Ribbens
2024-11-18 17:35:36 -05:00
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docs/queries/select.mdx
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@@ -107,9 +107,9 @@ const getPosts = async () => {
The `defaultPopulate` property allows you specify which fields to select when populating the collection from another document.
This is especially useful for links where only the `slug` is needed instead of the entire document.
With this feature, you can dramatically reduce the amount of JSON that is populated from [Relationship](/docs/beta/fields/relationship) or [Upload](/docs/beta/fields/upload) fields.
With this feature, you can dramatically reduce the amount of JSON that is populated from [Relationship](/docs/fields/relationship) or [Upload](/docs/fields/upload) fields.
For example, in your content model, you might have a `Link` field which links out to a different page. When you go to retrieve these links, you really only need the `slug` of the page.
For example, in your content model, you might have a `Link` field which links out to a different page. When you go to retrieve these links, you really only need the `slug` of the page.
Loading all of the page content, its related links, and everything else is going to be overkill and will bog down your Payload APIs. Instead, you can define the `defaultPopulate` property on your `Pages` collection, so that when Payload "populates" a related Page, it only selects the `slug` field and therefore returns significantly less JSON: