Orion Context Broker 属性部分更新可行性及请求URL构建咨询

Great question! This is a super common scenario when working with APIs, so let's break it down based on standard RESTful practices (the most widely used pattern for entity management):

Can You Update Only Some Attributes? #

Absolutely! Most modern APIs support partial updates—you can update just B and D, or any subset of attributes, without touching A and C. You don't have to update all attributes at once, nor are you limited to single-attribute updates.

That said, there are exceptions: some older or specialized APIs might require full updates (sending all attributes every time), but that's not the standard approach these days.

HTTP Methods for Updates #

To clarify the difference between partial and full updates:

• Partial update: Use the PATCH HTTP method. This is the standard way to modify only specific fields of an entity.
• Full update: Use the PUT method, which is meant to replace the entire entity—so you'd need to send all attributes (A, B, C, D) even if only a few change. Avoid using PUT for partial updates unless the API explicitly documents it as allowed.

Building the Request URL for Partial Updates #

Your URL should target the specific entity you want to modify. Assuming your entity has a unique identifier (like entityId, which is standard), the URL pattern would be:

https://your-api-domain.com/entities/{entityId}

Replace {entityId} with the actual unique ID of your entity (e.g., if the entity's ID is 456, the URL becomes https://your-api-domain.com/entities/456).

Example Request Body #

For updating only B and D, your request body (typically JSON) would only include those two fields:

{
  "B": "new-value-for-B",
  "D": "updated-value-for-D"
}

You don't need to include A or C—their existing values will remain unchanged on the server.

Edge Cases to Keep in Mind #

• A small number of APIs might use a custom endpoint (like POST to /entities/{entityId}/partial-update) instead of PATCH, but this isn't RESTful standard. Always check the API's documentation for specifics.
• If the API requires full updates with PUT, make sure to send all attributes (even the ones you're not changing) to prevent missing fields from being overwritten with null or default values.

内容的提问来源于stack exchange，提问作者zlash