Enhancement: Generic method to reduce errors for different scenarios.

[sfdcschwabe]

Related to this article named Error Handling Best Practices for Lightning Web Components I would like to suggest to create a reusable component like the below one.

It could be used in the following components:

• formulaShareRuleDetail.js:
• formulaShareRulesListView.js:

`/**

• Reduces one or more LDS errors into a string[] of error messages.

• @param {FetchResponse|FetchResponse[]} errors

• @return {String[]} Error messages
  */
  export function reduceErrors(errors) {
  if (!Array.isArray(errors)) {
  errors = [errors];
  }

  return (
  errors
  // Remove null/undefined items
  .filter((error) => !!error)
  // Extract an error message
  .map((error) => {
  // UI API read errors
  if (Array.isArray(error.body)) {
  return error.body.map((e) => e.message);
  }
  // UI API DML, Apex and network errors
  else if (error.body && typeof error.body.message === 'string') {
  return error.body.message;
  }
  // JS errors
  else if (typeof error.message === 'string') {
  return error.message;
  }
  // Unknown error shape so try HTTP status text
  return error.statusText;
  })
  // Flatten
  .reduce((prev, curr) => prev.concat(curr), [])
  // Remove empty strings
  .filter((message) => !!message)
  );
  }`

Source: https://github.com/trailheadapps/lwc-recipes/blob/master/force-app/main/default/lwc/ldsUtils/ldsUtils.js

[LawrenceLoz]

Yeah I like this a lot. There are inconsistencies with the way toast messages are constructed at the moment so this would definitely be an improvement. Once this is in place we could agree some standards around where toast messages are raised (e.g. we should catch errors from all server methods and show as toasts) and implement these

[sfdcschwabe]

Hi Lawrence

I hope you are fine and started smoothly into the new year?

What do you think is the best source branch to work on this in a separated branch?

[LawrenceLoz]

Yes doing well thanks. I have some time off but somehow still found myself overrun with things! Hope you're doing well and enjoying 2021 so far 👍

I'd say at this point branching from the release branch is probably best. You might want to wait until we've got your other branch merged which should hopefully be quick to do (sorry this has sat unmerged for a while I must have missed a notification)