Class: ActiveRecord::Refined::AST::ArrayPredicate

Inherits:
Predicate
  • Object
show all
Defined in:
lib/active_record/refined/ast.rb

Overview

Comparisons against a PostgreSQL array column, named after the Ruby methods that mean the same thing: member? is Enumerable's element test, superset? and subset? are Set's whole-array containment, and intersect? is Array's "any element in common". Each name maps to one operator; the elements are rendered as an array literal, which PostgreSQL coerces to the column's element type, so any expression works as the operand and no schema lookup is needed.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Predicate

#!, #&, #|

Methods inherited from Node

#as, #asc, #desc

Constructor Details

#initialize(operand, operator, elements) ⇒ ArrayPredicate

Returns a new instance of ArrayPredicate.



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# File 'lib/active_record/refined/ast.rb', line 671

def initialize(operand, operator, elements)
  @operand = operand
  @operator = operator
  @elements = elements
end

Instance Attribute Details

#elements ⇒ Object (readonly)

Returns the value of attribute elements.



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# File 'lib/active_record/refined/ast.rb', line 669

def elements
  @elements
end

#operand ⇒ Object (readonly)

Returns the value of attribute operand.



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# File 'lib/active_record/refined/ast.rb', line 669

def operand
  @operand
end

#operator ⇒ Object (readonly)

Returns the value of attribute operator.



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# File 'lib/active_record/refined/ast.rb', line 669

def operator
  @operator
end

Class Method Details

.elements(arg, method_name) ⇒ Object

The whole-array comparisons take the collection kinds their namesakes compare against: an Array, or a Set for the Set methods.



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# File 'lib/active_record/refined/ast.rb', line 660

def self.elements(arg, method_name)
  case arg
  when ::Array then arg
  when ::Set then arg.to_a
  else
    raise ArgumentError, "#{method_name} takes an Array or Set of elements"
  end
end

Instance Method Details

#to_arel(table) ⇒ Object 



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# File 'lib/active_record/refined/ast.rb', line 677

def to_arel(table)
  arel_operand = to_arel_operand(operand, table)
  quoted = Arel::Nodes.build_quoted(array_literal)
  case operator
  when :"@>" then Arel::Nodes::Contains.new(arel_operand, quoted)
  when :"&&" then Arel::Nodes::Overlaps.new(arel_operand, quoted)
  else Arel::Nodes::InfixOperation.new(operator, arel_operand, quoted)
  end
end