23 lines
1.2 KiB
Ruby
23 lines
1.2 KiB
Ruby
class QuantityValue < ActiveRecord::Base
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# Requirement validation for :registry left to subclasses
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# Polymorphic registry (including :registry_type) is required - despite 1:1
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# mapping between Nutrient:Food, Readout:Measurement, Threshold:Target ... -
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# to allow for accessing registry item without knowing QuantityValue (subitem)
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# type, e.g. qv.registry.completed_at
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belongs_to :registry, polymorphic: true
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belongs_to :quantity, required: true
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validate do
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errors.add(:quantity, :domain_mismatch) unless self.class::DOMAIN == quantity.domain
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end
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belongs_to :unit, required: true
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# Uniqueness is checked exclusively on the other end of association level.
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# Otherwise validation may not pass when multiple Values are updated at once
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# and some quantity_id is moved from one Value to the other (without duplication).
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# For the same reason Value quantity_id uniqueness has to be checked on the
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# other end when multiple Values are first created. Relying on local check
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# only would make all newly added records pass as valid despite duplications.
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#validates :quantity, uniqueness: {scope: [:measurement_id, :unit_id]}
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#validates :quantity, uniqueness: {scope: :food_id}
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end
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