Class: Dbee::Query::Sorter

Inherits:
Object
  • Object
show all
Includes:
Direction
Defined in:
lib/dbee/query/sorter.rb

Overview

Abstract representation of the ORDER BY part of a SQL statement.

Defined Under Namespace

Modules: Direction

Constant Summary

Constants included from Direction

Direction::ASCENDING, Direction::DESCENDING

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key_path:, direction: ASCENDING) ⇒ Sorter

Returns a new instance of Sorter.

Raises:

  • (ArgumentError) 


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# File 'lib/dbee/query/sorter.rb', line 24

def initialize(key_path:, direction: ASCENDING)
  raise ArgumentError, 'key_path is required' if key_path.to_s.empty?

  @direction  = Direction.const_get(direction.to_s.upcase.to_sym)
  @key_path   = KeyPath.get(key_path)

  freeze
end

Instance Attribute Details

#direction ⇒ Object (readonly)

Returns the value of attribute direction.



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# File 'lib/dbee/query/sorter.rb', line 22

def direction
  @direction
end

#key_path ⇒ Object (readonly)

Returns the value of attribute key_path.



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# File 'lib/dbee/query/sorter.rb', line 22

def key_path
  @key_path
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/dbee/query/sorter.rb', line 50

def <=>(other)
  "#{key_path}#{direction}" <=> "#{other.key_path}#{other.direction}"
end

#==(other) ⇒ Object Also known as: eql? 



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# File 'lib/dbee/query/sorter.rb', line 45

def ==(other)
  other.key_path == key_path && other.direction == direction
end

#ascending? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dbee/query/sorter.rb', line 37

def ascending?
  !descending?
end

#descending? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dbee/query/sorter.rb', line 33

def descending?
  direction == DESCENDING
end

#hash ⇒ Object 



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# File 'lib/dbee/query/sorter.rb', line 41

def hash
  "#{key_path}#{direction}".hash
end