Class: Squeel::Nodes::Literal

Inherits:
Object
  • Object
show all
Includes:
Aliasing, Operators, PredicateOperators, PredicateMethods
Defined in:
lib/squeel/nodes/literal.rb

Overview

Literal nodes are a container for raw SQL.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Aliasing

#as

Methods included from Operators

#*, #+, #-, #/, #op

Methods included from PredicateOperators

#&, #-@, #|

Constructor Details

#initialize(expr) ⇒ Literal

Returns a new instance of Literal.



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# File 'lib/squeel/nodes/literal.rb', line 16

def initialize(expr)
  @expr = expr
end

Instance Attribute Details

#expr ⇒ Object (readonly)

Returns the value of attribute expr.



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# File 'lib/squeel/nodes/literal.rb', line 14

def expr
  @expr
end

Instance Method Details

#asc ⇒ Order

Create an ascending Order node with this Literal as its expression

Returns:

  • (Order) —

    The new Order node



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# File 'lib/squeel/nodes/literal.rb', line 34

def asc
  Order.new self, 1
end

#desc ⇒ Order

Create a descending Order node with this Literal as its expression

Returns:

  • (Order) —

    The new Order node



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# File 'lib/squeel/nodes/literal.rb', line 40

def desc
  Order.new self, -1
end

#eql?(other) ⇒ Boolean

Object comparison

Returns:

  • (Boolean) 


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# File 'lib/squeel/nodes/literal.rb', line 45

def eql?(other)
  self.class.eql?(other.class) &&
  self.expr.eql?(other.expr)
end

#hash ⇒ Object

To support object equality tests



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# File 'lib/squeel/nodes/literal.rb', line 51

def hash
  expr.hash
end

#to_s ⇒ String Also known as: to_str

Returns The Literal’s String equivalent.

Returns:

  • (String) —

    The Literal’s String equivalent.



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# File 'lib/squeel/nodes/literal.rb', line 64

def to_s
  expr.to_s
end

#to_sym ⇒ NilClass

expand_hash_conditions_for_aggregates assumes our hash keys can be converted to symbols, so this has to be implemented, but it doesn’t really have to do anything useful.

Returns:

  • (NilClass) —

    Just to avoid bombing out on expand_hash_conditions_for_aggregates



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# File 'lib/squeel/nodes/literal.rb', line 59

def to_sym
  nil
end