Every block has a different set of attributes. These attributes are specified as a JSON Schema object. Previously, every block registered its own block renderer route using its attributes for the schema. This allowed for the attributes to be validated using the built in endpoint validation rules. It had the unfortunate side effect, however, of creating a large number of nearly identical REST API routes, one for each dynamic block. Each registered route has a performance impact. As the number of server side blocks goes up, this becomes more and more of an issue.
Now, we register a single block renderer route and dynamically validate the attributes based on the selected block.
Fixes#48079.
Props gziolo, TimothyBlynJacobs.
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This adds a missing DocBlock for `::register_routes()` and parameter descriptions for `::post_process_item()`.
Includes minor documenation fixes in other REST API classes for consistency.
Props dkarfa, mukesh27, SergeyBiryukov.
Fixes#48841.
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Several filters were introduced to the render_block method since the initial implementation of the block-renderer/ endpoints, causing the output of those endpoints to diverge from the rendered content of blocks on the frontend.
Props kadamwhite, TimothyBlynJacobs, miinasikk.
Fixes#49387.
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Caches the output of get_item_schema() to avoid redundant recomputation of translatable strings and other computed values. This method is called many times per item in each REST request, and the results of the method should not vary between calls.
Additional schema fields are not cached.
Props kadamwhite, joehoyle, TimothyBlynJacobs.
Fixes#47871.
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- Skips validation where there is no attribute definition, but keeps the attribute value. Previously, the attribute would be omitted from the attributes passed to `render_callback`. Notably, this resolves an issue where `render_callback` cannot receive a block's `align` and `customClassName` attribute values, since these are defined as a client-side filter.
- Validates `null` as a proper value in its own right. Previously, a client implementation of a block could track `{“attribute":null}` as an explicitly empty value, and the server would wrongly initiate defaulting behavior. The new behavior will now only populate a default value if the attribute is not defined at all, including when unset in its being invalid per the attribute schema.
Props aduth, noisysocks, youknowriad, danielbachhuber.
Merges [43918] to trunk.
See #45145 for the patch, #45098 for the original ticket.
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`WP_REST_Block_Renderer_Controller` allows rendering of server-side rendered blocks, whilst `WP_REST_Blocks_Controller` allows retrieving of reusable blocks.
Merges [43805] and [43806] from the 5.0 branch to trunk.
Props desrosj, danielbachhuber, pento, Presskopp, swissspidy.
See #45065, #45098.
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