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Add new Rails/WhereExists cop #286

Merged
merged 1 commit into from
Jul 15, 2020
Merged

Add new Rails/WhereExists cop #286

merged 1 commit into from
Jul 15, 2020

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fatkodima
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This cop enforces the use of exists?(...) over where(...).exists?.

  # bad
  User.where(name: 'john').exists?
  User.where(['name = ?', 'john']).exists?
  User.where('name = ?', 'john').exists?
  user.posts.where(published: true).exists?

  # good
  User.exists?(name: 'john')
  User.where('length(name) > 10').exists?
  user.posts.exists?(published: true)

@koic koic merged commit d1fe676 into rubocop:master Jul 15, 2020
@koic
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koic commented Jul 15, 2020

Thanks!

@beauraF
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beauraF commented Jul 27, 2020

I find this less readable. Is there another reason than consistency involve in this choice?

@fatkodima
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Just consistency and style preferences.

@dvandersluis
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Can this be made configurable so that the opposite can be enforced? where(...).exists? instead of exists?(...)

@dvandersluis dvandersluis mentioned this pull request Sep 2, 2020
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@dvandersluis
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I created #342 to make the preferred style configurable.

@dvandersluis dvandersluis mentioned this pull request Sep 3, 2020
Merged
9 tasks
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 2, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
517caf2 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 2, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
e1961c1 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
@koic koic mentioned this pull request Apr 2, 2021
Merged
9 tasks
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 3, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
9512cc7 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 3, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
e0ad5be 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 3, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
6857bdd 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 3, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
e8725d0 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
koic added a commit to koic/rubocop-rails that referenced this pull request Apr 8, 2021
@koic
Mark Rails/WhereExists as unsafe auto-correction
6260b8b 
## Summary

This cop is unsafe because the behavior may change on the following case:

```ruby
Author.includes(:articles).where(articles: {id: id}).exists?
#=> Perform `eager_load` behaviour (`LEFT JOIN` query) and get result.

Author.includes(:articles).exists?(articles: {id: id})
#=> Perform `preload` behaviour and `ActiveRecord::StatementInvalid` error occurs.
```

## Additional Information

And this cop may be considered disabled by default as there is no consensus on the default style.

- rubocop#286
- rubocop#342
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4 participants
@fatkodima @koic @beauraF @dvandersluis