Class: Sequel::SQL::OrderedExpression

Inherits:
Expression show all
Defined in:
lib/sequel/sql.rb

Overview

Represents a column/expression to order the result set by.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Expression

#==, attr_reader, comparison_attrs, #eql?, #hash, #lit, #sql_literal

Constructor Details

#initialize(expression, descending = true) ⇒ OrderedExpression

Set the expression and descending attributes to the given values.



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# File 'lib/sequel/sql.rb', line 758

def initialize(expression, descending = true)
  @expression, @descending = expression, descending
end

Instance Attribute Details

#descending ⇒ Object (readonly)

Whether the expression should order the result set in a descending manner



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# File 'lib/sequel/sql.rb', line 755

def descending
  @descending
end

#expression ⇒ Object (readonly)

The expression to order the result set by.



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# File 'lib/sequel/sql.rb', line 752

def expression
  @expression
end

Instance Method Details

#asc ⇒ Object

Return a copy that is ASC



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# File 'lib/sequel/sql.rb', line 763

def asc
  OrderedExpression.new(@expression, false)
end

#desc ⇒ Object

Return a copy that is DESC



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# File 'lib/sequel/sql.rb', line 768

def desc
  OrderedExpression.new(@expression)
end

#invert ⇒ Object

Return an inverted expression, changing ASC to DESC and vice versa



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# File 'lib/sequel/sql.rb', line 773

def invert
  OrderedExpression.new(@expression, !@descending)
end