https://github.com/midnightmonster/rails-utils

https://github.com/midnightmonster/rails-utils

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• Host: GitHub
• URL: https://github.com/midnightmonster/rails-utils
• Owner: midnightmonster
• Created: 2021-08-13T01:38:58.000Z (about 3 years ago)
• Default Branch: master
• Last Pushed: 2021-09-27T14:04:49.000Z (about 3 years ago)
• Last Synced: 2024-10-22T02:13:19.659Z (17 days ago)
• Language: Ruby
• Size: 6.84 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Rails Utilities

## MultiCount

Are you sending multiple queries to get different counts or summaries of the same rows of data? Is Postgres giving you side-eye because you ask it to visit the same records several times in one controller action? `MultiCount` is here for you. `include MultiCount` in your `ApplicationModel` and replace those 2-10 queries with one smart, fast query.

```ruby

# Assuming foo and bar are Widget scopes...

widgets = factory.widgets.available

foo_count = widgets.foo.count

bar_count = widgets.bar(zonk).count

spin_counts = widgets.group(:spin).count

# ...becomes...

foo_count, bar_count, spin_counts = 

  factory.widgets.available.multi_count(

    :foo,

    [:bar,zonk],

    Arel.sql('widgets.spin')

  )

# ...which runs a single query that in most cases is no slower than the

# slowest of the original three. Sometimes it's actually faster, due to

# Query Planner Mysteries.

```

## CountVonCount

You're using `find_each` to avoid instantiating thousands of records at once, but are you really releasing those records or accidentally holding on to them? Use `CountVonCount` to audit exactly what Ruby's allocating and garbage collecting.

## Snowdrift

Explicitly and conveniently accumulate and report on counts, lists, and sets over multi-step processes, even with nested levels of consideration. (E.g., while processing inventory reports, track available widgets by store, region, and globally.) `Snowdrift` is not specific to Rails/ActiveRecord and could be used in any Ruby application.