Module: ConcernsOnRails::Models::Hashable

Extended by:
ActiveSupport::Concern
Defined in:
lib/concerns_on_rails/models/hashable.rb

Constant Summary collapse

VALID_TYPES = 
%i[hex uuid integer custom].freeze
MAX_GENERATION_ATTEMPTS = 
10

Instance Method Summary collapse

Instance Method Details

#assign_hashable_value ⇒ Object

Assigns the generated value only when the field is blank, so callers can still pass an explicit value at create time.



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# File 'lib/concerns_on_rails/models/hashable.rb', line 104

def assign_hashable_value
  field = self.class.hashable_field
  return if self[field].present?

  self[field] = if self.class.hashable_unique
                  unique_hashable_value(field)
                else
                  self.class.generate_hashable_value
                end
end

#unique_hashable_value(field) ⇒ Object

Best-effort uniqueness: retry on an in-Ruby collision before insert. Pair with a unique DB index for the real guarantee (mirrors Tokenizable).



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# File 'lib/concerns_on_rails/models/hashable.rb', line 117

def unique_hashable_value(field)
  ConcernsOnRails::Models::Hashable::MAX_GENERATION_ATTEMPTS.times do
    candidate = self.class.generate_hashable_value
    return candidate unless self.class.unscoped.exists?(field => candidate)
  end
  raise "ConcernsOnRails::Models::Hashable: could not generate a unique value for '#{field}' " \
        "after #{ConcernsOnRails::Models::Hashable::MAX_GENERATION_ATTEMPTS} attempts"
end