Class: ConceptQL::Nodes::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/conceptql/nodes/node.rb

Constant Summary collapse

KNOWN_TYPES = 
i(
  condition_occurrence
  death
  drug_cost
  drug_exposure
  observation
  payer_plan_period
  procedure_cost
  procedure_occurrence
  visit_occurrence
)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Node 



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# File 'lib/conceptql/nodes/node.rb', line 18

def initialize(*args)
  args.flatten!
  if args.last.is_a?(Hash)
    @options = args.pop.symbolize_keys
  end
  @options ||= {}
  @values = args.flatten
end

Instance Attribute Details

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/conceptql/nodes/node.rb', line 17

def values
  @values
end

Instance Method Details

#arguments ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 47

def arguments
  @arguments ||= values.reject { |v| v.is_a?(Node) }
end

#children ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 39

def children
  @children ||= values.select { |v| v.is_a?(Node) }
end

#columns(select_types = types) ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 51

def columns(select_types = types)
  [:person_id___person_id] + KNOWN_TYPES.map do |known_type|
    select_types.include?(known_type) ? "#{known_type}_id___#{known_type}_id".to_sym : Sequel.expr(nil).cast(:bigint).as("#{known_type}_id".to_sym)
  end + date_columns
end

#date_columns ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 57

def date_columns
  [:start_date, :end_date]
end

#evaluate(db) ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 27

def evaluate(db)
  select_it(query(db))
end

#select_it(query, select_types = types) ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 31

def select_it(query, select_types=types)
  query.select(*columns(select_types))
end

#stream ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 43

def stream
  @stream ||= children.first
end

#types ⇒ Object 



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# File 'lib/conceptql/nodes/node.rb', line 35

def types
  @types ||= children.map(&:types).flatten.uniq
end