关于Asterank API的使用方法及获取全部小行星数据的技术咨询

Hey there! Let's walk through your questions about the Asterank API clearly:

The Asterank API uses a MongoDB-style query syntax, making it flexible to fetch exactly the data you need. Here's how to use it:

• Understand the base request structure: The core URL is http://asterank.com/api/asterank?query={query}&limit={limit}
  • query: A JSON object defining your filtering criteria (follows MongoDB query rules)
  • limit: The maximum number of results you want in a single request
• Basic unfiltered example: To get the first 10 asteroid records, use this request:

  http://asterank.com/api/asterank?query={}&limit=10
  

  This returns 10 entries with default sorting, including fields like id, name, a (semi-major axis), diameter, and more.
• Filtered example: If you want asteroids with a diameter larger than 10 km, structure your query like this:

  http://asterank.com/api/asterank?query={"diameter": {"$gt": 10}}&limit=20
  

  The $gt operator means "greater than"—you can use other MongoDB operators like $lt, $eq, or $in for more complex filters.

You can't fetch all asteroid data in one single request (due to API limits), but you can do it in batches with these steps:

• Set an empty query: To match all asteroids, set the query parameter to {}. This tells the API you don't want to filter any records out.
• Batch requests with limit and pagination:
  1. Start with a large limit (check the API's implicit limit—common values are 1000 per request) to get the first batch:

     http://asterank.com/api/asterank?query={}&limit=1000
     

  2. Look at the last entry in the response, note its unique identifier (like id or full_name).
  3. Create a new query to fetch the next batch by filtering for records after that identifier. For example, if the last ID was 2000001, use:

     http://asterank.com/api/asterank?query={"id": {"$gt": 2000001}}&limit=1000
     

  4. Repeat this process until the response has fewer entries than your set limit—that means you've grabbed all available data.
• Key notes:
  • Don't spam requests too quickly—add a small delay between batches to avoid hitting rate limits.
  • Some asteroids might have missing fields (like diameter), but the empty query will still return all existing records regardless of missing data.

内容的提问来源于stack exchange，提问作者lallal