Class: ConceptQL::Operators::Intersect

Inherits:
PassThru show all
Defined in:
lib/conceptql/operators/intersect.rb

Constant Summary

Constants inherited from Operator

Operator::COLUMNS

Instance Attribute Summary

Attributes inherited from Operator

#arguments, #options, #upstreams, #values

Instance Method Summary collapse

Methods inherited from Operator

#columns, #evaluate, #initialize, #label, #select_it, #set_values, #sql, #stream

Methods included from Metadatable

#allows_many_upstreams, #allows_one_upstream, #argument, #category, #desc, #humanized_class_name, #inherited, #just_class_name, #option, #predominant_types, #preferred_name, #reset_categories, #to_metadata

Constructor Details

This class inherits a constructor from ConceptQL::Operators::Operator

Instance Method Details

#query(db) ⇒ Object 



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# File 'lib/conceptql/operators/intersect.rb', line 14

def query(db)
  exprs = {}
  upstreams.each do |expression|
    evaled = expression.evaluate(db)
    expression.types.each do |type|
      (exprs[type] ||= []) << evaled
    end
  end
  typed_queries = exprs.map do |type, queries|
    queries.inject do |q, query|
      q.intersect(query)
    end
  end

  typed_queries.inject do |q, query|
    q.union(query, all: true)
  end
end

#types ⇒ Object 



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# File 'lib/conceptql/operators/intersect.rb', line 10

def types
  upstreams.map(&:types).flatten.uniq
end