Class: ParamsReady::Query::GroupingOperator

Inherits:
Object
  • Object
show all
Defined in:
lib/params_ready/query/grouping.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/params_ready/query/grouping.rb', line 125

def type
  @type
end

Class Method Details

.instance(type) ⇒ Object

Raises:



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# File 'lib/params_ready/query/grouping.rb', line 127

def self.instance(type)
  raise ParamsReadyError, "Unimplemented operator: #{type}" unless @instances.key? type
  @instances[type]
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/params_ready/query/grouping.rb', line 155

def ==(other)
  return false unless other.class <= GroupingOperator
  type == other.type
end

#arel_method ⇒ Object 



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# File 'lib/params_ready/query/grouping.rb', line 132

def arel_method
  case type
  when :and, :or then type
  else
    raise ParamsReadyError, "Unimplemented operator: #{type}"
  end
end

#connect(a, b) ⇒ Object 



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# File 'lib/params_ready/query/grouping.rb', line 149

def connect(a, b)
  return b if a.nil?
  return a if b.nil?
  a.send arel_method, b
end

#test(record, predicates) ⇒ Object 



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# File 'lib/params_ready/query/grouping.rb', line 160

def test(record, predicates)
  definite = predicates.map do |predicate|
    predicate.test(record)
  end.compact

  return nil if definite.empty?

  definite.send(test_method)
end

#test_method ⇒ Object 



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# File 'lib/params_ready/query/grouping.rb', line 140

def test_method
  case type
  when :and then :all?
  when :or then :any?
  else
    raise ParamsReadyError, "Unimplemented operator: #{type}"
  end
end