`print_schema` should be deterministic

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#135 opened on Aug 4, 2017 5 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Stale
Tech stack: graphql, python
Domain: api, backend

Research direction

Start by locating the print_schema entry point and any tests covering schema output. Check how object fields and field arguments are ordered, then verify that printing the same schema repeatedly produces identical output.

Written by the indexing model from the issue text.

Description

In our project, we commit a graphql schema to our repo. This is useful for running demos, tests and mocking data.

However, now we also want to be able to ensure that the schema is kept up-to-date with a CI check. Unfortunately, printing the schema twice, seems to not be guaranteed to print values in the same order (especially keys in object types, and field arguments). This makes consistency checks significantly harder.

It'd be great if there was a guarantee of determinism. Running the printer repeatedly, against a given schema always outputs the same file.

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

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