Class: ConceptQL::Operators::ConcurrentWithin

Inherits:
Operator
  • Object
show all
Defined in:
lib/conceptql/operators/concurrent_within.rb

Instance Attribute Summary

Attributes inherited from Operator

#arguments, #errors, #nodifier, #options, #upstreams, #values

Instance Method Summary collapse

Methods inherited from Operator

#annotate, #cast_column, #code_list, codes_should_match, #columns, #create_upstreams, #data_model, #database_type, default_query_columns, #domains, #dup_values, #dynamic_columns, #evaluate, inherited, #initialize, #inspect, #label, new, #operator_name, #optimized, query_columns, register, require_column, #required_columns, #scope, #select_it, #setup_select, #sql, #stream, #to_op, #unionable?, #upstreams_valid?, #valid?

Methods included from Metadatable

#allows_many_upstreams, #allows_one_upstream, #argument, #auto_label, #basic_type, #category, #derive_metadata_from_validations, #desc, #domains, #get_desc, #humanized_class_name, #inherited, #just_class_name, #no_desc, #option, #predominant_domains, #pref_name, #preferred_name, #reset_categories, #standard_description, #to_metadata, #validate_at_least_one_upstream_to_metadata, #validate_at_most_one_upstream_to_metadata, #validate_no_arguments_to_metadata, #validate_no_upstreams_to_metadata, #validate_one_upstream_to_metadata, #validate_required_options_to_metadata, #warn_about_missing_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/concurrent_within.rb', line 20

def query(db)
  datasets = upstreams.map do |stream|
    stream.evaluate(db)
  end

  return datasets.first.from_self if datasets.length == 1

  adjusted_start_date = DateAdjuster.new(options[:start]).adjust(:l__start_date, true)
  adjusted_end_date = DateAdjuster.new(options[:end]).adjust(:l__end_date)

  datasets = datasets.map do |ds|
    matching = ds.from_self(:alias=>:l)

    (datasets - [ds]).each do |other|
      other = other
        .from_self(:alias=>:r)
        .where(adjusted_start_date <= :r__start_date)
        .where(adjusted_end_date >= :r__end_date)
        .select(:person_id)

      matching = matching.where(:person_id=>other)
    end

    matching
  end

  ds, *rest = datasets
  rest.each do |other|
    ds = ds.union(other, :from_self=>nil)
  end

  ds.from_self
end