Module: AdvancedAR

Defined in:: lib/advanced_ar/custom_preloaders.rb,
lib/advanced_ar.rb,
lib/advanced_ar/version.rb,
lib/advanced_ar/batch_matcher.rb,
lib/advanced_ar/batch_processor.rb,
lib/advanced_ar/param_validator.rb,
lib/advanced_ar/arbitrary_prefetch.rb,
lib/advanced_ar/batched_destruction.rb,
lib/advanced_ar/batching_csv_processor.rb

Overview

Add support for creating arbitrary associations when using ActiveRecord Adds a ‘prefetch` method to ActiveRecord Queries.

This method accepts a Hash. The keys of the Hash represent how the Association will be made available.
The values of the Hash may be an array of [Symbol, Relation] or another (filtered) Relation.
Objects are queried from an existing Association on the model. This Association is detemrined
by either the Symbol when an array is passed, or by finding an Assoication for the passed Relation's model

NOTICE: This implementation is NOT COMPLETE by itself - it depends on Goldiloader

to detect the use of the virtual associations and prevent N+1s. We were already using
Goldiloader, so this made sense. If this module is ever needed stand-alone,
the following options have been identified:
  1. Extend ActiveRecordRelationPatch#exec_queries to execute an ActiveRecord::Associations::Preloader
     that will load the related objects
  2. Duplicates the relevant snippets from Goldiloader into this module. See Goldiloader::AutoIncludeContext
The current Goldiloader implementation uses Option 1 internally, but also makes the relations lazy - even
  if you define a prefetch, it won't actually be loaded until you attempt to access it on one of the models.

Defined Under Namespace

Modules: ArbitraryPrefetch, BatchedDestruction, CustomPreloaders Classes: BatchMatcher, BatchProcessor, BatchingCsvProcessor, ParamValidator

Constant Summary collapse

VERSION =

"0.1.5".freeze