Hooks

Define hooks directly in your collection config. They run inside the local API on every operation.

import { defineCollection, fields } from "@/cms/core";
import { richTextToPlainText } from "@/cms/core";

export default defineCollection({
  slug: "posts",
  labels: { singular: "Post", plural: "Posts" },
  fields: {
    title: fields.text({ required: true }),
    body: fields.richText(),
    excerpt: fields.text({ maxLength: 300 }),
  },
  hooks: {
    beforeCreate(data, context) {
      // Auto-generate excerpt from body
      if (!data.excerpt && typeof data.body === "object") {
        data.excerpt = richTextToPlainText(data.body).slice(0, 180);
      }
      return data;
    },
    afterPublish(doc, context) {
      context.cache?.invalidate({ tags: ["posts", `post:${doc._id}`] });
    },
    afterDelete(doc, context) {
      context.cache?.invalidate({ tags: ["posts", `post:${doc._id}`] });
    },
  },
});

Available Hooks

Hook	Arguments	Return
`beforeCreate`	`(data, context)`	Modified data
`afterCreate`	`(doc, context)`	—
`beforeUpdate`	`(data, existing, context)`	Modified data
`afterUpdate`	`(doc, context)`	—
`beforeDelete`	`(doc, context)`	—
`afterDelete`	`(doc, context)`	—
`beforePublish`	`(doc, context)`	—
`afterPublish`	`(doc, context)`	—
`beforeUnpublish`	`(doc, context)`	—
`afterUnpublish`	`(doc, context)`	—
`beforeSchedule`	`(doc, context)`	—
`afterSchedule`	`(doc, context)`	—
`beforeUpsertTranslation`	`(data, locale, existing, context)`	Modified data

before* hooks on create/update receive the data and can modify it before saving. All other before* hooks can throw to abort the operation. after* hooks are for side effects like cache invalidation.

beforeUpsertTranslation is the only hook that fires on upsertTranslation — beforeCreate and beforeUpdate do not fire there.

Context

{
  user: { id, role, email } | null,
  operation: "create" | "update" | "delete" | ...,
  collection: "posts",
  timestamp: "2025-01-01T00:00:00Z",
  cache: {
    invalidate: ({ tags: string[] }) => void
  }
}

Cache Invalidation

Use context.cache.invalidate() in after* hooks to purge Astro’s route cache:

afterPublish(doc, context) {
  context.cache?.invalidate({
    tags: ["posts", `post:${doc._id}`]
  });
},

Tag your Astro pages to match:

---
Astro.cache.set({ tags: ["posts", `post:${post._id}`] });
---