Facebook如何自动检测帖子及评论ID？技术原理问询

Alright, let's walk through exactly how to pull your own Facebook posts and their associated comments using the Graph API—since you already know the basics of me/posts, let's dive into the detailed comment retrieval part:

1. Recap: Getting Your Posts #

• To fetch all your personal posts, call the me/posts endpoint. First, make sure your access token has the user_posts permission (critical for accessing your post data, especially if you're using this beyond a test environment).
• Each post in the response will have an ID formatted like {your_user_id}_{post_unique_id} (e.g., 1234_53). As you noted, pasting this ID directly into Facebook's URL takes you straight to the post—Facebook automatically parses the user ID from the left of the underscore and the post ID from the right.

2. Fetching Comments for Your Posts #

You have two efficient approaches to grab comments tied to your posts:

Option 1: Pull Posts + Comments in One Request #

Instead of making separate calls for posts and then comments, use field expansion to retrieve everything in a single API call. This is far more efficient and cuts down on unnecessary requests.

Use this endpoint:

GET /me/posts?fields=id,message,created_time,comments{id,message,from{id,name},created_time}

Let's break down the fields:

• Top-level fields (id, message, created_time): Basic details about your post (adjust these based on what you need).
• Nested comments field: Pulls in key comment details like the comment ID, text, the commenter's name/ID, and timestamp. You can add or remove fields here (e.g., add like_count if you want to see how many likes each comment got).

A sample snippet of the response might look like this:

{
  "data": [
    {
      "id": "1234_53",
      "message": "My weekend hike was amazing!",
      "created_time": "2024-05-20T14:30:00+0000",
      "comments": {
        "data": [
          {
            "id": "1234_53_789",
            "message": "Looks incredible! Where was this?",
            "from": {
              "id": "4567",
              "name": "Alex Smith"
            },
            "created_time": "2024-05-20T14:35:00+0000"
          }
        ]
      }
    }
  ]
}

Option 2: Fetch Comments for a Specific Post #

If you already have a post ID (like 1234_53) and only need comments for that single post, call the comments endpoint directly:

GET /{post_id}/comments?fields=id,message,from{id,name},created_time

Replace {post_id} with the full combined ID (e.g., 1234_53—you don't need to split the user ID and post ID apart; Facebook accepts the combined format here).

3. Key Things to Keep in Mind #

• Pagination: If you have lots of posts or comments, the API will return results in pages. Check the paging object in the response for a next URL to fetch the next set of results, or use the limit parameter (e.g., &limit=20) to control how many items are returned per page.
• Permissions: Double-check that your access token has the user_posts permission. For testing, you can use the Graph API Explorer to generate a token with the right permissions quickly.
• Rate Limits: Be mindful of Facebook's API rate limits—avoid spamming rapid requests to prevent being throttled.

内容的提问来源于stack exchange，提问作者The Coder