Class: ConceptQL::Nodes::Complement

Inherits:
PassThru show all
Defined in:
lib/conceptql/nodes/complement.rb

Constant Summary

Constants inherited from Node

Node::COLUMNS

Instance Attribute Summary

Attributes inherited from Node

#values

Instance Method Summary collapse

Methods inherited from PassThru

#types

Methods inherited from Node

#arguments, #children, #columns, #evaluate, #initialize, #select_it, #sql, #stream, #types

Constructor Details

This class inherits a constructor from ConceptQL::Nodes::Node

Instance Method Details

#query(db) ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
# File 'lib/conceptql/nodes/complement.rb', line 6

def query(db)
  child = children.first
  child.types.map do |type|
    positive_query = db.from(child.evaluate(db))
      .select(:criterion_id)
      .exclude(:criterion_id => nil)
      .where(:criterion_type => type.to_s)
    query = db.from(make_table_name(type))
      .exclude(make_type_id(type) => positive_query)
    db.from(select_it(query, type))
  end.inject do |union_query, q|
    union_query.union(q, all: true)
  end
end