What are some effective methods for handling data from a backend API within an Angular service?

I'm currently facing challenges in effectively managing and manipulating data retrieved from a backend API within an Angular 2+ service.

Take for instance the creation of a cart system. Upon sending an initial get request to fetch the current cart details from the backend, I encounter difficulties in efficiently handling this data.

What is considered the optimal approach for updating this data? Simply executing a put/post request may not trigger updates on components subscribed to the data. On the other hand, performing another get request to obtain the updated data might result in the new values being fetched before the backend logic processes the update and returns the modified data. Utilizing Subjects presents its own set of challenges as well.

This task appears to be quite common, yet I can't seem to pinpoint any obvious solutions that I may be overlooking.

If tasked with developing a cart system, or similar functionality that initially retrieves data from a backend and necessitates subsequent updates, how would you navigate through handling this data - what workflow would you adopt?

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Answer №1

Consider this approach, not necessarily the only one:

Data retrieval occurs upon user action, such as entering a page or clicking the refresh button. This allows users to view and interact with the data.

When updating data, send it to the server. If a successful response is received (indicating acknowledgment on the server side), treat the current client data as the most up-to-date version without making an additional request. Handle errors or timeouts accordingly.

If the server needs to modify the sent data, it can include the changes in the response to the update request (e.g., an ID) or provide information on when the correct data will be available (e.g., timespan).

In cases where external sources alter the data after you receive the old version but before updating it, return an error message prompting the user to refresh the data manually by clicking "OK." Subsequently, send a new request to the server for updated data.

Note that presenting users with outdated data from other sources, instead of reflecting their own edits, may result in a poor user experience.

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