How can I filter a CMS collection list by the current user ID on my Webflow blog website using Finsweet attributes and webhooks to get user information and IDs into a dedicated CMS collection?

To filter a CMS Collection List by the current user ID using Finsweet attributes and Webhooks in Webflow, you need to combine authentication, user data storage in the CMS, and client-side filtering with Finsweet’s CMS Library.

1. Understand the Architecture

• Webflow CMS does not support native user logins, so use a third-party auth service like Memberstack, Outseta, or Firebase.
• Create a CMS Collection called Users that stores each member's details, including a custom user ID.
• Use Finsweet CMS Library with Attributes to filter other Collection Lists based on the current logged-in user.

2. Set Up User Data in Webflow

• Create a CMS Collection called Users:
• Fields: Name, Email, Slug/UserID, and any other relevant fields.
• In your third-party auth service (e.g., through a signup webhook), create or update the User CMS item when a new member signs up.

3. Trigger Webhooks to Sync User Data

• Use a tool like Zapier, Make (Integromat), or a custom serverless function (e.g., from Firebase or Supabase) to:
• Listen for signup/login events.
• POST user data to the Webflow CMS using Webflow’s CMS API.
• Webflow CMS API requires:
• Site ID.
• Collection ID for the “Users” collection.
• An Authorization header with a Webflow API Token.

4. Identify the Current User in the Frontend

• Once authenticated, the third-party tool should expose the user’s ID or email in the front-end, typically via:
• Custom script injected via a <script> tag.
• Data attributes added to the DOM (e.g., <div id="current-user" data-user-id="12345">).

5. Filter a CMS Collection Using Finsweet Attributes

• Use the Finsweet Attributes CMS Library:
• Add fs-cmsfilter-element="list" to your CMS Collection List.
• Add fs-cmsfilter-field="userId" to your Collection Item wrapper (the field that stores the user ID).
• Use JavaScript to dynamically add a filter:
  ```js
  const userId = document.getElementById("current-user").getAttribute("data-user-id");
  window.fsAttributes = window.fsAttributes || [];
  window.fsAttributes.push([
  'cmsfilter',
  (filterInstances) => {
  const [filterInstance] = filterInstances;
  filterInstance.setFilter('userId', [userId]);
  },
  ]);
  ```
• Replace "userId" with the actual CMS field slug containing the user’s unique identifier.

6. Ensure CMS Relationships Are Accurate

• If you're filtering blog posts by who wrote or owns them:
• In your Blog Posts collection, have a Reference/Multi-Reference field to the Users collection.
• Set the user ID in that field via your webhook when creating posts.

7. Test the Flow

• Log in/sign up as a user through your auth provider.
• Confirm the CMS item for that user gets created or updated.
• Visit the blog page and ensure the Collection List is filtered to show only items with a userId that matches the current logged-in user.

Summary

To filter a CMS Collection List by user ID in Webflow, store user data in a “Users” CMS Collection via third-party signups and Webhooks. Use Finsweet Attributes’ CMS Filter to display personalized content, linking Collection items to unique user IDs and filtering them with JavaScript on the front end.