39 lines
1.3 KiB
Ruby
39 lines
1.3 KiB
Ruby
##
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# Validates if the give attribute is used across the reserved spaces.
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class CrossModelSlugValidator < ActiveModel::EachValidator
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FORMAT_REGEX = /\A[0-9a-z\-_]+\z/
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def validate_each(record, attribute, value)
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return if value.blank?
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correct_format?(record, attribute, value)
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not_on_reserved_list?(record, attribute, value)
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unique_across_models?(record, attribute, value)
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end
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private
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def not_on_reserved_list?(record, attribute, value)
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return false if record.instance_of?(::Page) || ReservedWords.all.exclude?(value)
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record.errors.add(attribute, I18n.t("validators.cross_model_slug_validator.is_reserved"))
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end
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def correct_format?(record, attribute, value)
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return false if value.match?(FORMAT_REGEX)
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record.errors.add(attribute, I18n.t("validators.cross_model_slug_validator.is_invalid"))
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end
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def unique_across_models?(record, attribute, value)
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# attribute_changed? is likely redundant, but is much cheaper than the cross-model exists check
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return false unless record.public_send("#{attribute}_changed?")
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return false unless already_exists?(value)
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record.errors.add(attribute, I18n.t("validators.cross_model_slug_validator.is_taken"))
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end
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def already_exists?(value)
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CrossModelSlug.exists?(value.downcase)
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end
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end
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