Gatsby Cloud Content Sync
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Content Sync is a Gatsby Cloud feature for improving the Preview experience for content authors.
When content authors press “Open Preview” in their CMS, Content Sync routes them to the correct URL. It helps them understand the status of previews, so they know when their content is ready to view and otherwise if there were any build errors. It does this by redirecting to a “waiting room” page which displays a loading state while the content preview builds. Once the build is complete, the author is redirected to the correct page on the frontend of the Gatsby Preview site automatically.
Content Sync will route users to the correct page even when pressing “Open Preview” from within a nested node which has no associated top-level page.
If the build for the preview fails or if no page is created that contains the content being previewed, Content Sync UI will display an error message.
In the case that your content lives on multiple pages, for example a blog post page and a blog listing page, and you find you’re being routed to the page you don’t want to view your preview on, you can specify which node owns which page using the
ownerNodeId setting in the
createPage API. Set the
ownerNodeId to the Gatsby
node.id of the node you want to preview for the page. Note that the
ownerNodeId must correspond to the
node.id of a node which is queried on that page via a GraphQL query.
You will not need to do this if you’re building pages using the File System Route API, or if your page context includes a matching
id property. See the next section for more info on this.
Content Sync uses the
unstable_createNodeManifest API via source plugins to allow source plugins to tell Gatsby which nodes are being previewed. When this public action is called, Gatsby uses an internal hierarchy to determine which page the content author intends to preview.
The hierarchy is as follows, from most specific to least specific:
ownerNodeIdproperty in the
createPageaction. (This is set manually by the Gatsby site developer)
- Nodes associated with pages created from the File System Route API. (automatic)
idproperty in the page
contextpassed to the
createPageAPI with a node id which matches the previewed node id. (automatic)
- The first matching node id found in Gatsby’s GraphQL query tracking which maps node id’s to pages that query them. This allows nodes which have no direct top-level page correlated with them to be previewed throughout the site. (automatic)