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Middleware can not add errors to execution context without raising an error

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#177 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python

Research direction

Start by reading graphql/execution/base.py around ExecutionContext.report_error(), which the issue identifies as the relevant entry point. Trace how middleware errors are currently raised and collected, then define completion as allowing an error to be reported while execution continues and returns a truncated list. No test file is mentioned in the issue.

Written by the indexing model from the issue text.

Description

Use case: I've written a middleware for limiting users to a daily quota of nodes. The middleware counts nodes of particular types we care about limiting, and when the user hits their limit the middleware will raise an exception saying that they've hit their limit.

This works great, except in the case of lists. In this case, we are returning to the user as many elements of the list as possible until they go over the limit, and then no more. In this case, the middleware can not raise an exception because that would prevent it from also returning the promise for the truncated list of data.

Ideally in the middleware I could call execution_context.report_error() from https://github.com/graphql-python/graphql-core/blob/b3a6bd0f89651af10a937e5270e46c696672a2e5/graphql/execution/base.py#L92 to add an error saying "your limit was hit, and list field XYZ has had its data truncated" to the list of reported errors, but then continue along and return the truncated list of data.

Dominant language
Python
Stars
371
Forks
175
PR merge metrics
No merged PRs in 30d

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