Building an EmDash Site

EmDash is a CMS built on Astro. It stores schema in the database (not in code), serves content via live content collections, and provides a full admin UI at /_emdash/admin. Sites are standard Astro projects with the emdash integration.

Common Gotchas

These are the things that silently break sites. Know them before you start.

1. Image fields are objects, not strings. post.data.featured_image is { id, src, alt }. Writing <img src={post.data.featured_image} /> renders [object Object]. Use <Image image={post.data.featured_image} /> from "emdash/ui".

2. entry.id vs entry.data.id are different things. entry.id is the slug (use in URLs). entry.data.id is the database ULID (use for getEntryTerms, Comments, and other API calls that need the real ID). Mixing them up causes silent empty results.

3. Taxonomy names must match the seed exactly. If your seed defines "name": "category", you must query getTerm("category", slug) -- not "categories". Wrong name = empty results, no error.

4. Always pass cacheHint to Astro.cache.set(). Every query returns a cacheHint. Call Astro.cache.set(cacheHint) on every page that queries content, or cache invalidation won't work when editors publish changes.

5. No getStaticPaths for CMS content. EmDash content is dynamic. Pages must be server-rendered (output: "server" in astro.config.mjs).

File Structure