Class: SampleModels::AttributeSequence::RequiredBelongsToSource

Inherits:
AbstractSource
  • Object
show all
Defined in:
lib/sample_models/attribute_sequence.rb

Instance Method Summary collapse

Methods inherited from AbstractSource

#next

Constructor Details

#initialize(assoc) ⇒ RequiredBelongsToSource

Returns a new instance of RequiredBelongsToSource.



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# File 'lib/sample_models/attribute_sequence.rb', line 95

def initialize(assoc)
  super()
  @assoc = assoc
  @previous_instances = {}
end

Instance Method Details

#existing_instance_not_previously_returned ⇒ Object 



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# File 'lib/sample_models/attribute_sequence.rb', line 101

def existing_instance_not_previously_returned
  previous_ids = @previous_instances.values.map(&:id)
  instance = nil
  if previous_ids.empty?
    @assoc.klass.last
  else
    @assoc.klass.last(
      :conditions => ["id not in (?)", previous_ids]
    )
  end
end

#set_instance ⇒ Object 



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# File 'lib/sample_models/attribute_sequence.rb', line 113

def set_instance
  instance = existing_instance_not_previously_returned
  instance ||= @assoc.klass.sample
  @previous_instances[@number] = instance
end

#value ⇒ Object 



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# File 'lib/sample_models/attribute_sequence.rb', line 119

def value
  if @previous_instances[@number]
    value = @previous_instances[@number]
    begin
      value.reload
      value.id
    rescue ActiveRecord::RecordNotFound
      set_instance
      @previous_instances[@number].id
    end
  else
    set_instance
    @previous_instances[@number].id
  end
end