Class: ConceptQL::Operators::Filter

Inherits:
BinaryOperatorOperator show all
Defined in:
lib/conceptql/operators/filter.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 BinaryOperatorOperator

#display_name, #graph_it, #upstreams

Methods inherited from Operator

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

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, #types

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/filter.rb', line 8

def query(db)
  rhs = right.evaluate(db)
  rhs = rhs.select_group(:person_id, :criterion_id, :criterion_type)
  query = db.from(Sequel.as(left.evaluate(db), :l))
  query = query
    .left_join(Sequel.as(rhs, :r), l__person_id: :r__person_id, l__criterion_id: :r__criterion_id, l__criterion_type: :r__criterion_type)
    .exclude(r__criterion_id: nil)
    .select_all(:l)
  db.from(query)
end