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[Merged by Bors] - Mention creation of disjoint Querys with Without<T> in conflicting access Panic #2413

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[Merged by Bors] - Mention creation of disjoint Querys with Without<T> in conflicting access Panic #2413

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MinerSebas
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@MinerSebas MinerSebas commented Jun 29, 2021 •
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Objective

Beginners semi-regularly appear on the Discord asking for help with using QuerySet when they have a system with conflicting data access.
This happens because the Resulting Panic message only mentions QuerySet as a solution, even if in most cases Without<T> was enough to solve the problem.

Solution

Mention the usage of Without<T> to create disjoint queries as an alternative to QuerySet

Open Questions

  • Is disjoint a too technical/mathematical word?
  • Should Without<T> be mentioned before or after QuerySet?
    • Before: Using Without<T> should be preferred and mentioning it first reinforces this for a reader.
    • After: The Panics can be very long and a Reader could skip to end and only see the QuerySet

@github-actions github-actions bot added the S-Needs-Triage This issue needs to be labelled label Jun 29, 2021
@alice-i-cecile alice-i-cecile added A-ECS Entities, components, systems, and events C-Usability A targeted quality-of-life change that makes Bevy easier to use and removed S-Needs-Triage This issue needs to be labelled labels Jun 29, 2021
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Sort of as an additional issue, I wonder if this is something we can catch at compile time perhaps?

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NathanSWard approved these changes Jun 29, 2021
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looks, good to me (other than my small nit).
Though, as I stated before, I'm curious if this is something we could potentially catch at compile time rather than runtime...

crates/bevy_ecs/src/system/system_param.rs Outdated Show resolved Hide resolved
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Update crates/bevy_ecs/src/system/system_param.rs
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Co-authored-by: Nathan Ward <43621845+NathanSWard@users.noreply.github.com>
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Though, as I stated before, I'm curious if this is something we could potentially catch at compile time rather than runtime...

IIRC doing so is quite challenging, and will become increasingly so if we get dynamic systems or especially archetype invariants (#1481). I do sympathize with the desire though.

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This is a clear uncontroversial improvement to an important error message.

@alice-i-cecile alice-i-cecile added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Jun 29, 2021
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@mockersf shouldn't you just bors r+ this at this point instead of approving? Simple and useful error message fixes feel like they're within the "uncontroversial" scope :p

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mockersf commented Jul 1, 2021

bors r+

bors bot pushed a commit that referenced this pull request Jul 1, 2021
@MinerSebas
Mention creation of disjoint Querys with Without<T> in conflicting …
b911a00 
…access Panic (#2413)

# Objective

Beginners semi-regularly appear on the Discord asking for help with using `QuerySet` when they have a system with conflicting data access.
This happens because the Resulting Panic message only mentions `QuerySet` as a solution, even if in most cases `Without<T>` was enough to solve the problem.

## Solution

Mention the usage of `Without<T>` to create disjoint queries as an alternative to `QuerySet`

## Open Questions

- Is `disjoint` a too technical/mathematical word?
- Should `Without<T>` be mentioned before or after `QuerySet`?
  - Before: Using `Without<T>` should be preferred and mentioning it first reinforces this for a reader.
  - After: The Panics can be very long and a Reader could skip to end and only see the `QuerySet`


Co-authored-by: MinerSebas <66798382+MinerSebas@users.noreply.github.com>
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bors bot commented Jul 1, 2021

Pull request successfully merged into main.

Build succeeded:

@bors bors bot changed the title Mention creation of disjoint Querys with Without<T> in conflicting access Panic [Merged by Bors] - Mention creation of disjoint Querys with Without<T> in conflicting access Panic Jul 1, 2021
@bors bors bot closed this Jul 1, 2021
@MinerSebas MinerSebas deleted the disjoint_mention branch July 2, 2021 12:33
ostwilkens pushed a commit to ostwilkens/bevy that referenced this pull request Jul 27, 2021
@MinerSebas @ostwilkens
Mention creation of disjoint Querys with Without<T> in conflicting …
6c2e379 
…access Panic (bevyengine#2413)

# Objective

Beginners semi-regularly appear on the Discord asking for help with using `QuerySet` when they have a system with conflicting data access.
This happens because the Resulting Panic message only mentions `QuerySet` as a solution, even if in most cases `Without<T>` was enough to solve the problem.

## Solution

Mention the usage of `Without<T>` to create disjoint queries as an alternative to `QuerySet`

## Open Questions

- Is `disjoint` a too technical/mathematical word?
- Should `Without<T>` be mentioned before or after `QuerySet`?
  - Before: Using `Without<T>` should be preferred and mentioning it first reinforces this for a reader.
  - After: The Panics can be very long and a Reader could skip to end and only see the `QuerySet`


Co-authored-by: MinerSebas <66798382+MinerSebas@users.noreply.github.com>
@MinerSebas MinerSebas mentioned this pull request Sep 2, 2021
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@mockersf mockersf mockersf approved these changes

@NathanSWard NathanSWard NathanSWard approved these changes

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