Class: DataMapper::Query::Conditions::NotOperation

Inherits:
AbstractOperation show all
Defined in:
lib/dm-core/query/conditions/operation.rb

Overview

class OrOperation

Instance Attribute Summary

Attributes inherited from AbstractOperation

#operands, #parent

Instance Method Summary collapse

Methods inherited from AbstractOperation

#clear, descendants, #difference, #each, #empty?, #first, inherited, #intersection, #merge, #one?, #slug, slug, #sorted_operands, #union, #valid?

Methods included from Equalizer

#equalize

Methods included from Assertions

#assert_kind_of

Instance Method Details

#<<(operand) ⇒ self

Add an operand to the operation

This will only allow a single operand to be added.

Parameters:

Returns:

  • (self) —

    the operation



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# File 'lib/dm-core/query/conditions/operation.rb', line 560

def <<(operand)
  assert_one_operand(operand)
  assert_no_self_reference(operand)
  super
end

#matches?(record) ⇒ true

Match the record

Parameters:

Returns:

  • (true) —

    true if the record matches, false if not



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# File 'lib/dm-core/query/conditions/operation.rb', line 544

def matches?(record)
  operand = self.operand
  operand.respond_to?(:matches?) ? !operand.matches?(record) : true
end

#minimize ⇒ self, ...

Minimize the operation

Returns:



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# File 'lib/dm-core/query/conditions/operation.rb', line 584

def minimize
  minimize_operands
  prune_operands

  # factor out double negatives if possible
  operand = self.operand
  one? && instance_of?(operand.class) ? operand.operand : self
end

#negated? ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Test if the operation is negated

Defaults to return false.

Returns:

  • (Boolean) —

    true if the operation is negated, false if not



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# File 'lib/dm-core/query/conditions/operation.rb', line 611

def negated?
  parent = self.parent
  parent ? !parent.negated? : true
end

#operand ⇒ AbstractOperation, ...

Return the only operand in the operation

Returns:



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# File 'lib/dm-core/query/conditions/operation.rb', line 572

def operand
  first
end

#to_s ⇒ String

Return the string representation of the operation

Returns:

  • (String) —

    the string representation of the operation



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# File 'lib/dm-core/query/conditions/operation.rb', line 599

def to_s
  empty? ? '' : "NOT(#{operand.to_s})"
end