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module OpenTox
# Basic feature class
class Feature
field :measured, type: Boolean
field :calculated, type: Boolean
field :category, type: String
field :unit, type: String
field :conditions, type: Hash
# Is it a nominal feature
# @return [TrueClass,FalseClass]
def nominal?
self.class == NominalFeature
end
# Is it a numeric feature
# @return [TrueClass,FalseClass]
def numeric?
self.class == NumericFeature
end
end
# Feature for categorical variables
class NominalFeature < Feature
field :accept_values, type: Array
end
# Feature for quantitative variables
class NumericFeature < Feature
end
# Feature for SMARTS fragments
class Smarts < NominalFeature
field :smarts, type: String
index "smarts" => 1
# Create feature from SMARTS string
# @param [String]
# @return [OpenTox::Feature]
def self.from_smarts smarts
self.find_or_create_by :smarts => smarts
end
end
end
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