Class: ActiveRecordResolver

Inherits:
Object show all
Defined in:
lib/etl/transform/foreign_key_lookup_transform.rb

Overview

Resolver which resolves using ActiveRecord.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ar_class, find_method) ⇒ ActiveRecordResolver

Initialize the resolver. The ar_class argument should extend from ActiveRecord::Base. The find_method argument must be a symbol for the finder method used. For example:

ActiveRecordResolver.new(Person, :find_by_name)

Note that the find method defined must only take a single argument.



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# File 'lib/etl/transform/foreign_key_lookup_transform.rb', line 73

def initialize(ar_class, find_method)
  @ar_class = ar_class
  @find_method = find_method
end

Instance Attribute Details

#ar_class ⇒ Object

The ActiveRecord class to use



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# File 'lib/etl/transform/foreign_key_lookup_transform.rb', line 61

def ar_class
  @ar_class
end

#find_method ⇒ Object

The find method to use (as a symbol)



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# File 'lib/etl/transform/foreign_key_lookup_transform.rb', line 64

def find_method
  @find_method
end

Instance Method Details

#resolve(value) ⇒ Object

Resolve the value



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# File 'lib/etl/transform/foreign_key_lookup_transform.rb', line 79

def resolve(value)
  rec = ar_class.__send__(find_method, value)
  rec.nil? ? nil : rec.id
end