Module: CohortScope::ActiveRecordRelationInstanceMethods

Defined in:
lib/cohort_scope/active_record_relation_instance_methods.rb

Instance Method Summary collapse

Instance Method Details

#big_cohort(characteristics, options = {}) ⇒ Object

Find the biggest scope possible by removing characteristics in any order. Returns an empty scope if it can’t meet the minimum scope size.



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# File 'lib/cohort_scope/active_record_relation_instance_methods.rb', line 5

def big_cohort(characteristics, options = {})
  BigCohort.new self, characteristics, (options[:minimum_cohort_size] || (klass.respond_to?(:minimum_cohort_size) ? klass.minimum_cohort_size : nil))
end

#strict_cohort(*args) ⇒ Object

Find the first acceptable scope by removing characteristics in strict order, starting with the last characteristic. Returns an empty scope if it can’t meet the minimum scope size.

characteristics must be key/value pairs (splat if it’s an array)

Note that the first characteristic is implicitly required.

Take this example, where favorite color is considered to be “more important” than birthdate:

ordered_characteristics = [ [:favorite_color, 'heliotrope'], [:birthdate, '1999-01-01'] ]
Citizen.strict_cohort(*ordered_characteristics) #=> [...]

If the original characteristics don’t meet the minimum scope size, then the only characteristic that can be removed is birthdate. In other words, this would never return a scope that was constrained on birthdate but not on favorite_color.



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# File 'lib/cohort_scope/active_record_relation_instance_methods.rb', line 23

def strict_cohort(*args)
  args = args.dup
  options = args.last.is_a?(::Hash) ? args.pop : {}
  characteristics = args
  StrictCohort.new self, characteristics, (options[:minimum_cohort_size] || (klass.respond_to?(:minimum_cohort_size) ? klass.minimum_cohort_size : nil))
end